Turbulence

Evapotranspiration

Carbon cycle

Energy cycle

Water cycle

Forest Hydro-Meteorology

Life sciences, Forest science, Forestry/Forest Engineering, Forest Hydrology

Apr. 2021 - Present
College of Bioresource Sciences, Nihon University, Associate Professor

Apr. 2017 - Mar. 2021
College of Bioresource Sciences, Nihon University, Assistant Professor

Apr. 2014 - Mar. 2017
College of Bioresource Sciences, Nihon University, Assistant Professor

Apr. 2011 - Mar. 2014
College of Bioresource Sciences, Nihon University, Reserch Assistant

Apr. 2006 - Mar. 2011
Japan Conservation Engineers CO.,LTD.

Apr. 2005 - Mar. 2006
Musashi University, Part-time instructor

Apr. 2000 - Mar. 2003
Nihon University, Graduate School of Bioresource Sciences, Natural Environment Studies

Apr. 1994 - Mar. 1998
Nihon University, Faculty of Agriculture and Veterinary Medicine, Department of forest Science

Apr. 2021 - Present
Advisor, THE KANTO FOREST SOCIETY

Mar. 2014 - May 2016
Assistant Advisor, The Japanese Forest Society

Environmental responses of leaf gas exchange traits in Fagus crenata planted in cool- and warm-temperate zones
Rikuto YAMADA; Izumi KOSAKA; Yamato SASAKI; Mihasu SUZUKI; Takehide SENBONMATSU; Dai HAYAKAWA; Haruki MAENO; Yuta OKA; Hideki TAKIZAWA
Kanto Journal of Forest Research, Mar. 2025, Refereed, Not invited
Corresponding

Gas exchange and leaf characteristics of Fagus crenata planted in cool- and warm-temperate zones in Japan
Moeka HATAGISHI; Izumi KOSAKA; Kotono SHIRAI; Kimiyo MATSUKURA; Yuko OHAT; Hideki TAKIZAWA; Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2024, Refereed, Not invited
Corresponding

Effects of summer soil moisture reduction on heat fluxes in a cool-temperate Fagus crenata-dominated deciduous broadleaf forest
Kaito IKUTA; Izumi KOSAKA; Taichi SADAMOTO; Moeka HATAGISHI; Kotono SHIRAI; Hideki TAKIZAWA; Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2024, Refereed
Corresponding

Water Retention Characteristics of Superabsorbent Polymers (SAPs) Used as Soil Amendments
Masamichi Takahashi; Izumi Kosaka; Seiichi Ohta
Soil Systems, Jun. 2023, Refereed

Comparison of elemental runoff in two adjacent catchments at snowy forest region
Kenshin INAYAMA; Hideki TAKIZAWA; Kei SUGAYA; Ippei MIZUNO; Daichi YOSHIZAWA; Izumi KOSAKA
Kanto Journal of Forest Research, Mar. 2023, Refereed

Relationship between the photosynthetic net assimilation rate and stomatal conductance of water vapor in Fagus crenata planted at a low elevation in the temperate region on the Pacific Ocean side, Japan
Kanon KATAGIRI; Izumi KOSAKA; Yuuki YANASE; Kanane SUGIMOTO; Hideki TAKIZAWA; Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2023, Refereed
Corresponding

Deposition of rainfall and loads of runoff in Minakami university forest at snowy region in two years
Kenshin INAYAMA; Hideki TAKIZAWA; Ippei MIZUNO; Masashi KAZAMA; Izumi KOSAKA
Kanto Journal of Forest Research, Mar. 2022, Refereed

Variations of precipitation deposition and throughfall deposition of coniferous canopy in Minakami university forest
Hideki TAKIZAWA; Kanta TAKESHITA; Izumi KOSAKA
Kanto Journal of Forest Research, Mar. 2022, Refereed

Measurements of transpiration and photosynthetic net assimilation rate of Fagus crenata at a low elevation in the temperate region on the Pacific Ocean side, Japan
Mai YAGASAKI; Izumi KOSAKA; Rui OBA; Ryosuke NAKAI; Hideki TAKIZAWA; Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2022, Refereed
Corresponding

Variations of precipitation deposition and loads of runoff in minakami university forest at snowy region
Hideki TAKIZAWA; Masashi KAZAMA and Izumi KOSAKA
Kanto Journal of Forest Research, Mar. 2021, Refereed, Not invited

Effects of low summer air temperatures on CO2 flux in a cool-temperate, Fagus crenata-dominated deciduous broadleaf forest
Rui OBA; Izumi KOSAKA; Ryoma KANAI; Rendai KAZAMA; Yuki SAKATA; Tatsuaki HOSHINO; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2021, Refereed, Not invited
Corresponding

Temporal and spatial variability of Leaf Area Index in a cool-temperate deciduous broadleaf forest dominated by Fagus crenata
Shohei NONAKA; Izumi KOSAKA; Rui OBA; Masaki SUGO; Yudai KAWATSU; Hideki TAKIZAWA; Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2021, Refereed, Not invited
Corresponding

Effects of soil hardness on root growth and pulling down moment of Pinus thunbergii in coastal forest
Wataru FURUYA; Izumi KOSAKA; Hideki TAKIZAWA; Kazutoki ABE and Ayumi SAKAI
Kanto Journal of Forest Research, Mar. 2020, Refereed, Not invited

A consideration for the forest function of preventing shallow landslide
Ryota KAKETANI; Izumi KOSAKA; Hideki TAKIZAWA,Kazutoki ABE and Yasuhiko OKADA
Kanto Journal of Forest Research, Mar. 2020, Refereed, Not invited

Water chemistry of spring waters in the uppermost area of forest catchment
Hideki TAKIZAWA; Ryohei SUZUKI and Izumi KOSAKA
Kanto Journal of Forest Research, Mar. 2020, Refereed, Not invited

Soil respiration and soil properties at different topographical locations in a cool-temperate deciduous broadleaf forest dominated by Fagus crenata
Suguru MATSUSHIMA; Izumi KOSAKA; Rikuto UCHINO; Kazuki SHIMIZU; Hideaki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2020, Refereed, Not invited
Corresponding

Effects of different weather conditions on CO2 flux after foliation in a cool-temperate deciduous broadleaf forest in Japan (2017–2019)
Rui OBA; Izumi KOSAKA; Yoshihiko SHIOZAKI; Josuke USHIDA; Hikarui WADA; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2020, Refereed, Not invited
Corresponding

Variability in heat fluxes in summer in a cool-temperate deciduous broadleaf forest dominated by Fagus crenata
Izumi KOSAKA; Suguru MATSUSHIMA; Rui OBA; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2020, Refereed, Not invited
Lead

Variability in CO2 flux from spring to summer in a cool-temperate deciduous broadleaf forest dominated by Fagus crenata -A comparison between 2017 and 2018-
Kensuke ASAKURA; Izumi KOSAKA; Yuuki SHIMADA; Kotomi MIYAURA; Kamami FURUHATA; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Feb. 2020, Refereed, Not invited
Corresponding

Difference of soil respiration rate in northern and southern slope positions at a cool-temperate deciduous broad-leaved forest dominated by Fagus crenata
Kazuki TAKANO; Izumi KOSAKA; Sarina TAMURA; Yuuta SUGIYAMA; Saki HONJO; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Jul. 2019, Refereed, Not invited
Corresponding

Comparison of runoff process of several ion concentrations at two forest catchments on a heavy snow region
Azusa TAMANOI; Kazusa KITOH; Moeko NAKANO; Ako HOIZUMI; Izumi KOSAKA and Hideki TAKIZAWA
Kanto Journal of Forest Research, Nov. 2018, Refereed, Not invited

Study on evaluating method using root pull-out resistance for tree roots effect to prevent shallow landslide
Ryouta KAKETANI; Hideki TAKIZAWA; Izumi KOSAKA; Waka SONOHARA; Itsurou ISHIGAKI and Kazutoki ABE
Journal of the Japan Society of Erosion Control Engineering, Sep. 2018, Refereed, Not invited

Spatial variability of soil respiration in different topographical locations in a cool-temperate deciduous broad leaved forest dominated by Fagus crenata
Natsumi TAKADA; Izumi KOSAKA; Ryousuke OKOSHI; Mayu KAMATA; Risa KUROSAWA; Masumi MURATA; Hikaru MOROKAWA; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2018, Refereed, Not invited
Corresponding

The relationship between wind direction and energy balance at a cool-temperate deciduous broadleaf forest in a mountainous region
Hikaru MOROKAWA; Izumi KOSAKA; Ryosuke OKOSHI; Risa KUROSAWA; Mayu KAMATA; Natsumi TAKADA; Masumi MURATA; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2018, Refereed, Not invited
Corresponding

Runoff process of several ion concentrations for two seasons at forest catchments on a heavy snow region
Azusa TAMANOI,Kyohei TOYOIZUMI,Hideki TAKIZAWA and Izumi KOSAKA
Kanto Journal of Forest Research, Nov. 2017, Refereed, Not invited

Reflectance and transmittance properties of photosynthetically active radiation and near-infrared radiation in a cool-temperate deciduous broad leaved forest dominated by Fagus crenata
Shohei NONAKA; Izumi KOSAKA; Wataru ASAKA; Moeko SETO; Mitsuki TAKAMATSU; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Nov. 2017, Refereed, Not invited
Corresponding

Energy balance non-closure at a cool-temperate deciduous broadleaf forest in a mountainous region
Wataru ASAKA; Izumi KOSAKA; Shohei NONAKA; Moeko SETO; Mitsuki TAKAMATSU; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Nov. 2017, Refereed, Not invited
Corresponding

Measurment of soil respiration in different topographical locations in a cool-temperate deciduous broad leaved forest dominated by Fagus crenata
Moeko SETO; Izumi KOSAKA; Shohei NONAKA; Wataru ASAKA; Mitsuki TAKAMATSU; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2017, Refereed, Not invited
Corresponding

Effects of thinning in Cryptomeria japonica D. Don stand on its root growth and function of preventing shallow landslide
Ryouta KAKETANI; Hideki TAKIZAWA; Izumi KOSAKA; Waka SONOHARA; Itsurou ISHIGAKI and Kazutoki ABE
Journal of the Japanese society of revegetation technology, Nov. 2016, Refereed, Not invited

Stream water chemistry during snowmelt period at forest catchment of Okutone
Kyohei TOYOIZUMI; Kento MAESHIMA; Kazuki ORUI; Izumi KOSAKA; Sadao NAGASAKA and Hideki TAKIZAWA
Kanto Journal of Forest Research, Mar. 2016, Refereed, Not invited

The effects of relative leaf area on CO2 flux in a cool-temperate deciduous broadleaf forest dominated by Fagus crenata -A comparative study between 2014 and 2015-
Shohei NONAKA,Izumi KOSAKA,Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2016, Refereed, Not invited
Corresponding

Continuous energy flux measurements using an eddy covariance technique at a cool-temperate deciduous broad leaved forest
Izumi KOSAKA; Shohei NONAKA; Hasumi OTSUKA; Yoshimi SEKIZAKI; Yuuya TAGUCHI; Nobuhiro SHIMIZU; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Mar. 2016, Refereed, Not invited
Lead

Influence on aquatic insects caused by check dam construction
MIkako KOKUBUN; Natsuko TANAKA; Yui SAKAE; Ryouta KAKETANI; Yoshikazu NOZAWA; Takumi MURATSU; Hideki TAKIZAWA; Izumi KOSAKA and Kazutoki ABE
Journal of the Japanese society of revegetation technology, Aug. 2015, Refereed, Not invited

Seasonal variation in LAI from a cool-temperate deciduous broadleaved forest
Shohei NONAKA; Izumi KOSAKA; Miyuu KAWAGUCHI; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Jul. 2015, Refereed, Not invited
Corresponding

Interannual variation in daytime and nighttime net ecosystem exchange from a cool-temperate deciduous forest
Hitomi Akutsu; Izumi KOSAKA; Shouhei Koayashi; Tatsuki Honzaki; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Jul. 2015, Refereed, Not invited
Corresponding

The effect of air flow on the energy balance in a mountainous forest region
Takumi MATSUI; Izumi KOSAKA; Sinya MIKAMI; Zyouhei IGARI; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Jul. 2015, Refereed, Not invited
Corresponding

Seasonal variation in heat fluxes from a cool-temperate deciduous broadleaved forest
Maiko TAKAGI; Izumi KOSAKA; Chizuru SASAKI; Gentaro OKAMURA; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Jul. 2015, Refereed, Not invited
Corresponding

Diurnal changes in CO2 flux from a cool-temperate deciduous broadleaved forest in Japan - A comparison of data for 2013 and 2014 -
Yukino YAMAGUCHI; Izumi KOSAKA; Syunsuke SHIDA; Tatsuki HONZAKI; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Jul. 2015, Refereed, Not invited
Corresponding

Characteristics of wind turbulence over a deciduous broadleaved forest on complex terrain
Yayoi ASHIBA; Izumi KOSAKA; Takao NAKAMURA; Satomi AMAMATSU; Hideki TAKIZAWA and Kazutoki ABE
Kanto Journal of Forest Research, Jul. 2015, Refereed, Not invited
Corresponding

Seasonal variation in CO2 flux from a cool-temperate deciduous forest in Japan
Izumi KOSAKA; Hideki TAKIZAWA; Shohei KOBAYASHI; Chizuru SASAKI; Takao NAKAMURA; Ryota KAKETANI; Kazutoki ABE
Kanto Journal of Forest Research, Sep. 2014, Refereed, Not invited
Lead

The vegetation succession in crushed stone site
Hideki Takizawa; Yasuyuki Moriwaki; Shouhei Horiguchi; Kyouhei Toyoizumi; Izumi Kosaka; Syouiti Aihara
Kanto Journal of Forest Research, Sep. 2014, Refereed, Not invited

Characteristics of mountain and valley winds on a forested mountain slope
Izumi KOSAKA,Masahiro KOBAYASHI,Hideki TAKIZAWA
Kanto Journal of Forest Research, Sep. 2013, Refereed, Not invited
Lead

The soil physical property of the mountain trail surface damaged by the pressures
Hideki TAKIZAWA; Yuta YAMAMURO; Saemi MISHIMA; Izumi KOSAKA
Kanto Journal of Forest Research, Sep. 2012, Refereed, Not invited

Relationships between coordinate rotation and flux estimation above a forest on a mountain slope
Izumi KOSAKA and Hideki TAKIZAWA
Kanto Journal of Forest Research, Sep. 2012, Refereed, Not invited
Lead

Hydro-meteorological studies based on field observations at tropical Monsoon forests in northern Thailand: current ststus of knowledge and future research needs
Nobuaki TANAKA; Tomonori KUME; Natsuko YOSHIFUJI; Katsunori TANAKA; Hideki TAKIZAWA; Katsushige SHIRAKI; Izumi KOSAKA; Chatchai TANTASIRIN; Nipon TANGTHAM; Masakazu SUZUKI
Journal of Japan society of Hydrology and Water Resources, Jul. 2007, Refereed, Not invited

Characteristics of turbulence compoments above a hill evergreen forest in tropical region
Izumi KOSAKA; Hideki TAKIZAWA; Katsunori TANAKA; Chatchai TANTASIRIN; Masakazu SUZUKI; Yoshinori TSUKAMOTO
Journal of Japan society of Hydrology and Water Resources, Mar. 2004, Refereed, Not invited
Lead

Soil respiration and soil CO2 concentration in a tropical forest, Thailand
Shoji Hashimoto; Nobuaki Tanaka; Masakazu Suzuki; Ayako Inoue; Hideki Takizawa; Izumi Kosaka; Katsunori Tanaka; Chatchai Tantasirin; Nipon Tangtham
JOURNAL OF FOREST RESEARCH, Feb. 2004, Refereed, Not invited

Transpiration peak over a hill evergreen forest in northern Thailand in the late dry season: Assessing the seasonal changes in evapotranspiration using a multilayer model
K Tanaka; H Takizawa; N Tanaka; Kosaka, I; N Yoshifuji; C Tantasirin; S Piman; M Suzuki; N Tangtham
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, Sep. 2003, Refereed, Not invited

Seasonal trend in the occurrence of nocturnal drainage flow on a forested slope under a tropical monsoon climate
Hikaru KOMATSU; Narimasa YOSHIDA; Hideki TAKIZAWA; Izumi KOSAKA; Chatchai TANTASIRIN; and Masakazu SUZUKI
Boundary-Layer Meteorology, Mar. 2003, Refereed, Not invited

Process of occurrence and recovery of surface soil slides: An analysis in "preliminary area of erosion front" of mountain devastaion model
Yoshinori TSUKAMOTO; Izumi KOSAKA; Hideki TAKIZAWA; Itsurou ISHIGAKI; Masumi OOKOSI; Takasi FUKUDA
Journal of the Japan society of Erosion Control Engineering, Nov. 2001, Refereed, Not invited

Characterristics of sand distribution flying into the Shonan coastal pine forest
Yoshinori TUKAMOTO; Izumi KOSAKA; Kenzou UCHIYAMA; Shinsuke SAKATUME; Manabu SASAKI; Kazue SATOU
Journal of the Japanese Forest Society, Feb. 2001, Refereed, Not invited

Comparison of gas exchange between beech planted in cool and warm temperate zones
Izumi KOSAKA; Rikuto YAMADA; Yamato SASAKI; Mihasu SUZUKI; Takehide SENBONMATSU; Dai HAYAKAWA; Haruki MAENO; Yuta OKA; Hideki TAKIZAWA
The 136th Annual Meeting of the Japanese Forest Society, Mar. 2025, Not invited

Characteristics of runoff of stream water in snowy forested areas using oxygen stable isotope ratios
Hideki TAKIZAWA; Kenshin INAYAMA; Daisuke ITO; Koji TSUSHIMA; Izumi KOSAKA
The 136th Annual Meeting of the Japanese Forest Society, Mar. 2025, Not invited

Characteristics of Soil Physics in the area of ‘Fuyu-zakura’ at Sakurayama Park, Fujioka, Gunma Prefecture, Japan.
Yuko OTA; Yosuke HORIUCHI; Taishi HASHIMOTO; Ushio NAITO; Masato OKUBO; Yoki SUGIYAMA; Riko AKITA; Shunsuke ONUKI; Izumi KOSAKA; Masamichi TAKAHASHI; Ayumi ODA; Tadashi NISHIYAMA; Hiroyuki WADA; Hikaru ONOZATO; Kimiyo MATSUKURA
The 29th Meeting of the Tree Health Research Society, Japan, Nov. 2024, Not invited

Responses of stomatal conductance to vapor pressure deficit in Fagus crenata planted in cool- and warm-temperate zones
Rikuto YAMADA; Izumi KOSAKA; Yamato SASAKI; Mihasu SUZUKI; Takehide SENBONMATSU; Dai HAYAKAWA; Haruki MAENO; Yuta OKA; Hideki TAKIZAWA
The 14th Meeting of the Kanto Forest Research, Oct. 2024, Not invited

Gas exchange and leaf characteristics of Japanese beech (Fagus crenata) in different climate zones
Izumi KOSAKA; Moeka HATAGISHI; Kotono SHIRAI; Kaito IKUTA; Taichi SADAMOTO; Hideki TAKIZAWA; Kazutoki ABE
The 135th Annual Meeting of the Japanese Forest Society, Mar. 2024, Not invited

Measurements of photosynthetic and transpiration rates of Fagus crenata planted in cool- and warm-temperate zones
Moeka HATAGISHI; Izumi KOSAKA; Kotono SHIRAI; kaito IKUTA; Taichizumi SADAMOTO; Hideki TAKIZAWA; Kazutoki AB
The 13th Meeting of the Kanto Forest Research, Nov. 2023, Not invited

Long-term observation of heat fluxes in a cool-temperate Fagus crenata-dominated deciduous broadleaf forest
kaito IKUTA; Izumi KOSAKA; Taichizumi SADAMOTO; Moeka HATAGISHI; Kotono SHIRAI; Hideki TAKIZAWA; Kazutoki ABE
The 13th Meeting of the Kanto Forest Research, Nov. 2023, Not invited

Water use efficiency in Fagus crenata at a low elevation in the temperate region on the Pacific Ocean side
Izumi KOSAKA; Kano KATAGIRI; Yuuki YANASE; Hideki TAKIZAWA and Kazutoki ABE
The 134th Annual Meeting of the Japanese Forest Society, Mar. 2023, Not invited

Characteristics of dissolved matter at two forest catchment on a heavy snow region
Kenshin INAYAMA; Kei SUGAYA; IPei MIZUNO; Daichi YOSHIZAWA; Izumi KOSAKA; Hideki TAKIZAWA
The 12th Meeting of the Kanto Forest Research, Oct. 2022, Not invited

Water chemisty of spring waters in the uppermost area of forest catchment on a heavy snow region
Hideki TAKIZAWA; Takahiro ICHIKAWA; Izumi KOSAKA
The 12th Meeting of the Kanto Forest Research, Oct. 2022, Not invited

Measurements of transpiration and photosynthetic net assimilation rate of Fagus crenata ,at a low elevation in the temperate region on the Pacific Ocean side, Japan -A comparative study between 2021 and 2022-
Kanon KATAGIRI; Izumi KOSAKA; Yuuki YANASE; Kanane SUGIMOTO; Kou KITAYAMA; Tatsuya YOSHIDA; Hideki TAKIZA; Kazutoki ABE
The 12th Meeting of the Kanto Forest Research, Oct. 2022, Not invited

Measurements of soil respiration and stem respiration in a cool-temperate deciduous broadleaf forest dominated by Fagus crenata
Kosuke NAKAJIMA; Izumi KOSAKA; Kazunoshin OZAWA; Kaito SATO; Yukino NOMURA; Rusei HOKIMOTO; Hideki TAKIZA; Kazutoki ABE
The 12th Meeting of the Kanto Forest Research, Oct. 2022, Not invited

Soil Characteristics of brown root rot infested areas in Ogazawara islands
Yuko OTA; Aki MIYAZAKI; Mizuki HIGUCHI; Nartsuo OKAWA; Izumi KOSAKA; Kenichi YAZAKI; Hitomi HURUSAWA; Mitsuteru AKIBA and Norio SAHASHI
The 133th Annual Meeting of the Japanese Forest Society, Mar. 2022, Not invited

Seasonal variations of transpiration and photosynthetic net assimilation rate of Fagus crenata at a low elevation in the temperate region
Mai YAGASAKI; Izumi KOSAKA; Rui OBA; Hideki TAKIZAWA and Kazutoki ABE
The 133th Annual Meeting of the Japanese Forest Society, Mar. 2022, Not invited

Long-term observation of carbon dioxide exchange in a cool-temperate deciduous broadleaf forest
Izumi KOSAKA; Rui OBA; Mai YAGASAKI; Erina SHIMA; Hideki TAKIZAWA and Kazutoki ABE
The 133th Annual Meeting of the Japanese Forest Society, Mar. 2022, Not invited

Variations of precipitation deposition and loads of runoff in a heavy snow region
Kenshin INAYAMA; Hideki TAKIZAWA; Ippei MIZUNO; Satoshi KAZAMA and Izumi KOSAKA
The 11th Meeting of the Kanto Forest Research, Oct. 2021, Not invited

Relationship precipitation deposition and throughfall deposition at a Japanese Cedar in Minakami University Forest
Hideki TAKIZAWA; Kanta TAKESHITA and Izumi KOSAKA
The 11th Meeting of the Kanto Forest Research, Oct. 2021, Not invited

Effect of soil moisture on summertime CO2 flux in a cool-temperate deciduous broadleaf forest
Rui Oba; Izumi KOSAKA; Minoru SAITO; Mai YAGASAKI; Yuuki YAMAZAKI; Sota WATANABE; Hideki TAKIZAWA and Kazutoki ABE
The 11th Meeting of the Kanto Forest Research, Oct. 2021, Not invited

Measurements of transpiration and photosynthetic net assimilation rate of Fagus crenata in the Pacific side of southern Kanto region
Mai YAGASAKI; Izumi KOSAKA; Rui Oba; Shoki OONUMA; Miharu KANAI; Shohei KIMURA; Genta YAMADA; Hideki TAKIZAWA and Kazutoki ABE
The 11th Meeting of the Kanto Forest Research, Oct. 2021, Not invited

Relationship between summertime CO2 flux and air temperature in a cool-temperate deciduous broadleaf forest
Rui OBA; Izumi KOSAKA; Yuki SAKATA; Yudai KAWATSU; Masaki SUGO; Hideki TAKIZAWA and Kazutoki ABE
The 132th Annual Meeting of the Japanese Forest Society, Mar. 2021, Not invited

Long-term flux measurements using an eddy covariance technique in a cool-temperate deciduous forest
Izumi KOSAKA; Rui OBA; Ryoma KANAI; Rendai KAZAMA; Hideki TAKIZAWA and Kazutoki ABE
The 132th Annual Meeting of the Japanese Forest Society, Mar. 2021, Not invited

Dissolved ion budget in minakami university forest at snowy region
Hideki TAKIZAWA; Masashi KAZAMA and Izumi KOSAKA
The 10th Meeting of the Kanto Forest Research, Oct. 2020, Not invited

Variation of carbon dioxide exchange in summer in a cool-temperate deciduous broadleaf forest dominated by Fagus crenata
Rui OBA; Izumi KOSAKA; Ryoma KANAI; Rendai KAZAMA; Yudai KAWATSU; Hideki TAKIZAWA and Kazutoki ABE
The 10th Meeting of the Kanto Forest Research, Oct. 2020, Not invited

Leaf phenology and meteorological characteristics of Minakami Experimental Watershed, Nihon University Forest
Izumi KOSAKA; Rui OBA; Masaki SUGO; Yuki SAKATA; Tatsuaki HOSHINO; Hideki TAKIZAWA and Kazutoki ABE
The 10th Meeting of the Kanto Forest Research, Oct. 2020, Not invited

Dissolved ion budget in a deciduous broad-leaved forested catchments in a warm and snowy region
Hideki TAKIZAWA and Izumi KOSAKA
The 131th Annual Meeting of the Japanese Forest Society, Mar. 2020, Not invited

Variability in CO2 flux in a cool temperate deciduous broadleaf forest over a 6-year period
Rui OBA; Izumi KOSAKA; Suguru MASTUSHIMA; Hideki TAKIZAWA and Kazutoki ABE
The 131th Annual Meeting of the Japanese Forest Society, Mar. 2020, Not invited

Interannual variation of energy balance and evapotranspiration in a cool-temperate deciduous broadleaf forest over a 5-year period
Izumi KOSAKA; Suguru MASTUSHIMA; Rui OBA; Hideki TAKIZAWA and Kazutoki ABE
The 131th Annual Meeting of the Japanese Forest Society, Mar. 2020, Not invited

Study on the forest function of preventing shallow landslide
Ryota KAKETANI; Izumi KOSAKA; Hideki TAKIZAWA and Kazutoki ABE
The 9th Meeting of the Kanto Forest Research, Oct. 2019, Not invited

Effects of soil hardness on root growth and pulling down moment of Pinus thunbergii in coastal forest
Wataru FURUYA; Izumi KOSAKA; Hideki TAKIZAWA; Kazutoki ABE and Yasuhiko OKADA
The 9th Meeting of the Kanto Forest Research, Oct. 2019, Not invited

Water chemistry of spring waters in the uppermost area of forest catchment
Hideki TAKIZAWA; Ryohei SUZUKI and Izumi KOSAKA
The 9th Meeting of the Kanto Forest Research, Oct. 2019, Not invited

Effects of different weather conditions on CO2 flux after foliation in a cool-temperate deciduous broadleaf forest in Japan (2017–2019)
Rui OBA; Izumi KOSAKA; Yoshihiko SHIOZAKI; Josuke USHIDA; Hikarui WADA; Hideki TAKIZAWA and Kazutoki ABE
The 9th Meeting of the Kanto Forest Research, Oct. 2019, Not invited

Soil respiration and soil properties at different topographical locations in a cool-temperate deciduous broadleaf forest dominated by Fagus crenata
Suguru MATSUSHIMA; Izumi KOSAKA; Rikuto UCHINO; Kazuki SHIMIZU; Hideaki TAKIZAWA and Kazutoki ABE
The 9th Meeting of the Kanto Forest Research, Oct. 2019, Not invited

Variability in heat fluxes in summer in a cool-temperate deciduous broadleaf forest dominated by Fagus crenata
Izumi KOSAKA; Josuke USHIDA; Hikaru WADA; Hideki TAKIZAWA and Kazutoki ABE
The 9th Meeting of the Kanto Forest Research, Oct. 2019, Not invited

Inter-annual variability of CO2 flux at a cool-temperate deciduous broadleaf forest
Izumi KOSAKA; Kensuke ASAKURA; Yuuki SHIMADA; Hideki TAKIZAWA and Kazutoki ABE
The 130th Annual Meeting of the Japanese Forest Society, Mar. 2019, Not invited

Runoff characteristics of dissolved ion concentrations at two catchments in the Minakami experimental forest of Nihon University
Hideki TAKIZAWA; Azusa TAMANOI; Wataru OGURA; and Izumi kosaka
The 8th Meeting of the Kanto Forest Research, Oct. 2018, Not invited

Difference of soil respiration rate in southern and northen slope positions at a cool-temperate deciduous broad-leaved forest dominated by beech
Kazuki TAKANO; Izumi KOSAKA; Sarina TAMURA; Yuuta SUGIYAMA; Saki HONJYO; Hideki TAKIZAWA and Kazutoki ABE
The 8th Meeting of the Kanto Forest Research, Oct. 2018, Not invited

Characteristics of CO2 flux from spring to summer at a cool-temperate deciduous broad-leaved forest dominated by beech-A comparative study between 2017 and 2018-
Kensuke ASAKURA; Izumi KOSAKA; Yuuki SHIMADA; Kotomi MIYAURA; Kanami HURUHATA; Hideki TAKIZAWA and Kazutoki ABE
The 8th Meeting of the Kanto Forest Research, Oct. 2018, Not invited

Variations of ion concentrations of snowpack water and snowmelt water in the temperate snow area
Azusa TAMANOI; Hideki TAKIZAWA and Izumi KOSAKA
The 129th Annual Meeting of the Japanese Forest Society, Mar. 2018, Not invited

Runoff process of ion concentrations at two adjacent small and large forest catchments on a heavy snow region
Hideki TAKIZAWA; Azusa TAMANOI and Izumi KOSAKA
The 129th Annual Meeting of the Japanese Forest Society, Mar. 2018, Not invited

Measurement accuracy of heat fluxes by eddy covariance method in a at a cool-temperate deciduous broadleaf forest in a mountainous region
Izumi KOSAKA; Hikaru MOROKAWA; Natsumi TAKADA; Hideki TAKIZAWA and Kazutoki ABE
The 129th Annual Meeting of the Japanese Forest Society, Mar. 2018, Not invited

Spatial variability of soil respiration in differant topological locations in a cool-temperate deciduous broad leaved forest
Natsumi TAKADA; Izumi KOSAKA; Hikaru MOROKAWA; Ryosuke OKOSHI; Risa KUROSAWA; Masumi MURATA; Mayu KAMATA; Hideki TAKIZAWA and Kazutoki ABE
The 7th Meeting of the Kanto Forest Research, Oct. 2017, Not invited

Relationship between wind direction and energy balance at a cool-temperate deciduous broadleaf forest in a mountainous region
Hikaru MOROKAWA; Izumi KOSAKA; Ryosuke OKOSHI; Risa KUROSAWA; Mayu KAMATA; Natsumi TAKADAMasumi MURATA; Hideki TAKIZAWA and Kazutoki ABE
The 7th Meeting of the Kanto Forest Research, Oct. 2017, Not invited

Comparison of runoff process of several ion concentrations at two forest catchments on a heavy snow region
Azusa TAMANOI; Kazusa KITO; Moeko NAKANO; Ako HOIZUMI; Hideki TAKIZAWA and Izumi kosaka
The 7th Meeting of the Kanto Forest Research, Oct. 2017, Not invited

Seasonal and interannual variation in energy fluxes at a cool-temperate deciduous broadleaf forest
Izumi KOSAKA; Shohei NONAKAI; Wataru ASAKA; Moeko SETO; Mitsuki TAKAMATSU; Hideki TAKIZAWA and Kazutoki ABE
The 128th Annual Meeting of the Japanese Forest Society, Mar. 2017, Not invited

Runoff during snowmelt period at forest catchments in a heavy snow region
Hideki TAKIZAWA; Azusa TAMANOI; Kyouhei TOYOIZUMI and Izumi KOSAKA
The 128th Annual Meeting of the Japanese Forest Society, Mar. 2017, Not invited

Measurment of soil respiration in differant topological locations in a cool-temperate deciduous broad leaved forest
Moeko SETO; Izumi KOSAKA; Shouhei NONAKA; Wataru Asaka; Mitsuki TAKAMATSU; Hideki TAKIZAWA and Kazutoki ABE
The 6th Meeting of the Kanto Forest Research, Oct. 2016, Not invited

Characteristic of energy imbalance in a cool-temperate deciduous broad leaved forest
Wataru Asaka; Izumi KOSAKA; Shouhei NONAKA; Moeko SETO; Mitsuki TAKAMATSU; Hideki TAKIZAWA and Kazutoki ABE
The 6th Meeting of the Kanto Forest Society, Oct. 2016, Not invited

Reflectance and transmittance properties of the near-infrared radiation and photosynthetically active radiation in a cool-temperate deciduous broad leaved forest dominated by Fagus crenata
Shouhei NONAKA; Izumi KOSAKA; Wataru Asaka; Moeko SETO; Mitsuki TAKAMATSU; Hideki TAKIZAWA and Kazutoki ABE
The 6th Meeting of the Kanto Forest Society, Oct. 2016, Not invited

Characteristics of the energy balance and turbulence components over a cool-temperate deciduous broadleaf forest
Izumi KOSAKA; Shohei NONAKAI; Hasumi OTSUKA; Yoshimi SEKIZAKI; Yuuya TAGUCHI; Nobuhiro SHIMIZU; Hideki TAKIZAWA and Kazutoki ABE
The 127th Annual Meeting of the Japanese Forest Society, Mar. 2016, Not invited

Estimaing laef area index from canopy-transmitted radiation using three types of wavelength sensors in a deciduous forest
Shohei NONAKAI; izumi KOSAKA; Hasumi OTSUKA; Nobuhiro SHIMIZU; Yoshimi SEKIZAKI; Yuuya TAGUCHI; Hideki TAKIZAWA and Kazutoki ABE
The 127th Annual Meeting of the Japanese Forest Society, Mar. 2016, Not invited

Stream water chemistry during snowmelt period at forest catchment of Okutone
Kyohei TOYOIZUMI; Kento MAESHIMA; Kazuki ORUI; Izumi KOSAKA; Sadao NAGASAKA and Hideki TAKIZAWA
Kanto Journal of Forest Research, Oct. 2015, Not invited

Effects of relative leaf area on CO2 flux from a cool-temperate deciduous broadleaved forest dominated by Fagus crenata
Shohei NONAKA; Izumi KOSAKA; Hideki TAKIZAWA and Kazutoki ABE
The 5th Meeting of the Kanto Forest Society, Oct. 2015, Not invited

Continuous energy flux measurements using eddy covariance tecnique form a cool-temperate deciduous broad leaved forest
Izumi KOSAKA; Shouhei NONAKA; Hasumi OTSUKA; Yoshimi SEKIZAKA; Yuuya TAGUCHI; Nobuhiro SHIMIZU; Hideki TAKIZAWA and Kazutoki ABE
The 5th Meeting of the Kanto Forest Society, Oct. 2015, Not invited

Influence on aquatic insects caused by check dam construction
Mikako KOKUBUN; Natsuko TANAKA; Yui SAKAE; Ryouta KAKETANI; Yoshikazu NOZAWA; Hideki TAKIZAWA; Izumi KOSAKA; Kazutoki ABE
The 46th scientific research meeting of the Japanese society of revegetation technology, Sep. 2015, Not invited

Characteristics of the energy balance and turbulence components over a hill evergreen forest in tropical region
Izumi KOSAKA; Katsunori TANAKA; Nobuaki TANAKA; Natsuko YOSHIFUJI; Yasunori IGARASHI; Takanori SATO; Hideki TAKIZAWA; Chatchai TANTASIRIN and Masakazu SUZUKI
The 126th Annual Meeting of the Japanese Forest Society, Mar. 2015, Not invited

Seasonal variations of CO2 and heat fluxes from a cool-temparate deciduous forest
Shohei NONAKA; Izumi KOSAKA; Hitomi; AKUTSU; Yayoi ASHIBA; Maiko TAKAGI; Takumi MATSUI; Yukino YAMAGUCHI; Hideki TAKIZAWA and Kazutoki ABE
The 126th Annual Meeting of the Japanese Forest Society, Mar. 2015, Not invited

Variation of dissolved oxygen concentration at riparian forest
Hideki TAKIZAWA; Saori Nagaosa; Izumi KOSAKA
Kanto Journal of Forest Research, Oct. 2014, Not invited

Seasonal variation in Heat flux from a cool-temperate deciduous forest in Japan
Maiko Takagi; Izumi KOSAKA; Chizuru SASAKI; Gentaro Okamura; Hideki TAKIZAWA; Kazutoki ABE
The 4th Meeting of the Kanto Forest Society, Oct. 2014, Not invited

Seasonal variation in LAI at a cool-temperate deciduous forest in Japan
Shohei Nonaka; Izumi KOSAKA; Miyuu Kawaguchi; Hideki TAKIZAWA; Kazutoki ABE
The 4th Meeting of the Kanto Forest Society, Oct. 2014, Not invited

Diurnal variation in CO2 flux from a cool-temperate deciduous forest in Japan
Yukino Yamaguchi; Izumi KOSAKA; Shunsuke Shida; Tatsuki Honzaki; Hideki TAKIZAWA; Kazutoki ABE
The 4th Meeting of the Kanto Forest Society, Oct. 2014, Not invited

Seasonal variation in CO2 flux during daytime and nighttime from a cool-temperate deciduous forest in Japan
Hitomi Akutsu; Izumi KOSAKA; Shouhei Kobayashi; Tatsuki Honzaki; Hideki TAKIZAWA; Kazutoki ABE
The 4th Meeting of the Kanto Forest Society, Oct. 2014, Not invited

Characteristics of turbulence components over a deciduous broad-leaved forest on complex terrain
Yayoi Ashiba; Izumi KOSAKA; Takao Nakamura; Satomi Amamatsu; Hideki TAKIZAWA; Kazutoki ABE
The 4th Meeting of the Kanto Forest Society, Oct. 2014, Not invited

The effect of air flow on heat balance closure in a forested mountain region
Takumi Matsui; Izumi KOSAKA; Shinya Mikami; Johei Igari; Hideki TAKIZAWA; Kazutoki ABE
The 4th Meeting of the Kanto Forest Society, Oct. 2014, Not invited

Characteristics of the energy balance non-closure over a hill evergreen forest in northern Thailand
Izumi KOSAKA; Katsunori TANAKA; Nobuaki TANAKA; Natsuko YOSHIFUJI; Yasunori IGARASHI; Takanori SATO; Hideki TAKIZAWA; Chatchai TANTASIRIN and Masakazu SUZUKI
The 125th Annual Meeting of the Japanese Forest Society, Mar. 2014, Not invited

The soil environment and vegetation succession in crushed stone site
The 3rd Meeting of the Kanto Forest Society, Oct. 2013, Not invited

Seasonal variation in CO2 flux from a cool-temperate deciduous forest in Japan
Izumi KOSAKA; Hideki TAKIZAWA; Shohei KOBAYASHI; Chizuru SASAKI; Takao NAKAMURA; Ryota KAKETANI; Kazutoki ABE
The 3rd Meeting of the Kanto Forest Society, Oct. 2013, Not invited

Measurement of soil respiration in riparian forest valley bottom terrain
The 2nd Meeting of the Kanto Forest Society, Oct. 2012, Not invited

Characteristics of mountain and valley winds over a forest on complex terrain
The 2nd Meeting of the Kanto Forest Society, Oct. 2012, Not invited

Relationships between coordinate rotaion and flux estimation above a forest on a mountain slope
The 1st Meeting of the Kanto Forest Society, Oct. 2011, Not invited

The soil physical property of the mountain trail surface damaged by step pressures
The 1st Meeting of the Kanto Forest Society, Oct. 2011, Not invited

Seasonal variation of albedo at a hill evergreen forest and temperate coniferous forest
Syuhei KOMIZU; Hideki TAKIZAWA and Izumi KOSAKA
The 113th Annual Meeting of the Japanese Forest Society, Apr. 2002, Not invited

The general climate at hill evergreen forest of tropical monsoon area in northern Thailand
Proceedings of The Fifth International Study Conference on GEWEX in Asia and GAME, Oct. 2001, Not invited

Simulation of seasonal variation of energy balance over a hill evergreen forest in northern Thailand with multi-layer model
Proceedings of The Fifth International Study Conference on GEWEX in Asia and GAME, Oct. 2001, Not invited

Estimation of parameter on canopy conductance model based on turbulent flux observation
Proceedings of The Fifth International Study Conference on GEWEX in Asia and GAME, Oct. 2001, Not invited

Estimation of annual heat fluxes at a hill evergreen forest in northern Thailand with big-laef model-Seasonal variation of model parameters-
Izumi KOSAKA and Hideki TAKIZAWA
The 112th Annual Meeting of the Japanese Forest Society, Apr. 2001, Not invited

Seasonal variation of leaf area index (LAI) at a hill evergreen forest in northern Thailand
Hideki TAKIZAWA and Izumi KOSAKA
The 112th Annual Meeting of the Japanese Forest Society, Apr. 2001, Not invited

Seasonal Variation of Leaf Area Index (LAI) at the Kog-Ma Watershed ‐Measurement of the transmitted radiation in the canopy using the different wavelength radiometers‐
Proceedings of 2001 Workshop on GAME‐Tropics in Thailand GAME Publication No.32,GAME-Tropics, Mar. 2001, Not invited

Transport characteristics of heat, H2O and CO2 at hill evergreen forest of tropical monsoon area
Izumi KOSAKA; Hideki TAKIZAWA; Mazakazu SUZUKI and Katsunori TANAKA
The 111 Annual Meeting of the Japanese Forest Society, Apr. 2000, Not invited

Turbulent transport characteristics of heat, water vapor and CO2 above a forest canopy
Izumi KOSAKA and Hideki TAKIZAWA
The 110th Annual Meeting of the Japanese Forest Society, Apr. 1999, Not invited

Dec. 2011 - Present
The society of agricultural meteorology of Japan

Apr. 2011 - Present
The Japanese forest society

Apr. 2006 - Present
The Japan landslide society

Apr. 2002 - Present
The Japan society of hydrology and water resources