| Short title | Biogeochemistry | 
	
		| Oral presentation Date/Room/Chair
 | May 23 PM2 (16:15 - 18:00) | 302 | Taichi Yokokawa 
			/ Chisato Yoshikawa | 
	
		| May 24 AM1 (09:00 - 10:45) | 302 | Taichi Yokokawa 
			/ Chisato Yoshikawa 
			/ Takeo Hama 
			/ Takahito Yoshioka | 
	
		| May 24 AM2 (11:00 - 12:45) | 302 | Yoshinori Takano 
			/ Seiya Nagao 
			/ Rota Wagai 
			/ Atsushi Hayakawa | 
	
		| May 24 PM1 (14:15 - 16:00) | 302 | Rota Wagai 
			/ Atsushi Hayakawa 
			/ Keisuke Koba 
			/ Yoshiyuki Inagaki | 
	
		| Poster presentation Date/Room
 | May 23 (Core Time 18:15 - 19:30) | Convention Hall | 
	
		| Contact | Hideaki Shibata | 
	
		| Email | shiba@fsc.hokudai.ac.jp | 
	
		| Convener | Hideaki Shibata 
			/ Muneoki Yoh 
			/ Naohiko Ohkouchi 
			/ Youhei Yamashita | 
	
		| Scope | Biogeochemistry is an interdisciplinary study field including ecology, geochemistry, oceanography, limnology, hydrology, soil science and Environmental sciences.  However, researches tended to be conducted separately so far.  This session aims to provide a common platform for biogeochemists of different disciplines, which facilitates the interactive discussion and information exchanges for further development of biogeochemical studies. | 
	
		| Notes |  | 
	
		| Time | Presentation No | Title | Author | Presenter | Abstract | 
	
		| Oral Presentation   May 23 PM2 (16:15-18:00) 302                              to the top | 
	
		| 16:15 - 16:30 | MIS24-01 | Origin of nitrous oxide dissolved in the ocean deduced from concentration and isotope ratios | Sakae Toyoda FUJII, Ayako
 YOSHIDA, Naohiro
 other
 | Sakae Toyoda | English | 
	
		| 16:30 - 16:45 | MIS24-02 | Potential use of N_{2}* as a constraint of sedimentary denitrification in the deep ocean | Masahito Shigemitsu GRUBER, Nicolas
 OKA, Akira
 other
 | Masahito Shigemitsu | English | 
	
		| 16:45 - 17:00 | MIS24-03 | Island mass effect and nitrogen fixation | Takuhei Shiozaki Ken Furuya
 | Takuhei Shiozaki | English | 
	
		| 17:00 - 17:15 | 3-min talk in an oral session@(MIS24-P01/MIS24-P02/MIS24-P03/MIS24-P04/MIS24-P05) | 
	
		| 17:15 - 17:30 | 3-min talk in an oral session@(MIS24-P07/MIS24-P08/MIS24-P09/MIS24-P11/MIS24-P12) | 
	
		| 17:30 - 17:45 | 3-min talk in an oral session@(MIS24-P14/MIS24-P15/MIS24-P16/MIS24-P17/MIS24-P18) | 
	
		| 17:45 - 18:00 | 3-min talk in an oral session@(MIS24-P19/MIS24-P21/MIS24-P22/MIS24-P23/MIS24-P24/MIS24-P26) | 
	
		| Oral Presentation   May 24 AM1 (09:00-10:45) 302                              to the top | 
	
		| 09:00 - 09:15 | MIS24-04 | Trophic fractionation of carbon and nitrogen isotope ratios along food chains in marine, lake and grassland ecosystems | Maki Noguchi Reiichiro Ishii
 Eitaro Wada
 | Maki Noguchi | English | 
	
		| 09:15 - 09:30 | MIS24-05 | Earth's biogeochemical processes revealed by radiotracer-based activity measurement | Katsunori Yanagawa | Katsunori Yanagawa | English | 
	
		| 09:30 - 09:45 | MIS24-06 | Determination of elemental composition of diatom opal and its implication on the geochemical cycle in the Oceans | Mariko Emoto AKAGI, Tasuku
 TAKAHASHI, Kozo
 | Mariko Emoto | English | 
	
		| 09:45 - 10:00 | MIS24-07 | Speciation of iron(II) in oxic inland water | Masahiro Maruo Waka Oyama
 Hajime Obata
 | Masahiro Maruo | English | 
	
		| 10:00 - 10:15 | MIS24-08 | Decomposition process of labile DOC derived from phytoplankton | Yuji Hanamachi Koya Nakamura
 | Yuji Hanamachi | English | 
	
		| 10:15 - 10:30 | MIS24-09 | Decomposition process of macroalgal dissolved organic matter | Shigeki Wada TASHIRO Yuya
 TSUCHIYA Yasutaka
 other
 | Shigeki Wada | English | 
	
		| 10:30 - 10:45 | MIS24-10 | Relationship between fluorescence characteristics and molecular weight of FDOM produced by bacteria | Koichi Shimotori Keiji Watanabe
 Takeo Hama
 | Koichi Shimotori | English | 
	
		| Oral Presentation   May 24 AM2 (11:00-12:45) 302                              to the top | 
	
		| 11:00 - 11:15 | MIS24-11 | Study on migration of particulate organic matter in the Kushiro River using radiocarbon and stable carbon isotopes | Seiya Nagao SZUKI, Tomoyo
 SEKI, Osamu
 other
 | Seiya Nagao | English | 
	
		| 11:15 - 11:30 | MIS24-12 | Humic substances may control dissolved iron distributions in the global ocean: Implications from numerical simulations | Kazuhiro Misumi LINDSAY, Keith
 MOORE, J. Keith
 other
 | Kazuhiro Misumi | English | 
	
		| 11:30 - 11:45 | MIS24-13 | The sources of amino acids in marine sediments estimated from nitrogen isotopic composition of amino acids and chlorin | Yasuhiko T. Yamaguchi Hisami Suga
 Yoshinori Takano
 other
 | Yasuhiko T. Yamaguchi | English | 
	
		| 11:45 - 12:00 | MIS24-14 | QUANTITATIVE ESTIMATION OF METHANOGENIC POTENTIAL USING FACTOR F430 | Masanori Kaneko TAKANO, Yoshinori
 OGAWA, Nanako O.
 other
 | Masanori Kaneko | English | 
	
		| 12:00 - 12:15 | MIS24-15 | Physiological and genetic properties of key methanogenic Archaea for global methane emission from rice paddy fields. | Sanae Sakai | Sanae Sakai | English | 
	
		| 12:15 - 12:30 | MIS24-16 | Variation in delta N-15 among the soil organo-mineral particles of various sizes in two volcanic-ash soils | Maki Asano WAGAI, Rota
 | Maki Asano | English | 
	
		| 12:30 - 12:45 | MIS24-17 | Organic matter accumulation in volcanic ash soil revealed by C-13 tracer experiments and density fractionation analysis | Chie HAYAKAWA Rota, WAGAI
 Yoshiyuki, INAGAKI
 | Chie HAYAKAWA | English | 
	
		| Oral Presentation   May 24 PM1 (14:15-16:00) 302                              to the top | 
	
		| 14:15 - 14:30 | MIS24-18 | Mineralogical variations in tropical soils on African Shield | Atsushi Nakao Sugihara Soh
 Funakawa Shinya
 | Atsushi Nakao | English | 
	
		| 14:30 - 14:45 | MIS24-19 | Modification of the DNDC-Rice model to evaluate the nitrogen balance at a paddy field | Nobuko Katayanagi ONO, Keisuke
 FUMOTO, Tamon
 other
 | Nobuko Katayanagi | English | 
	
		| 14:45 - 15:00 | MIS24-20 | Rapid decomposition of organic matter in N-rich forest and cropland soils as revealed by cellulose filter incubation | Kazumichi Fujii Yoshiyuki Inagaki
 Kenji Ono
 other
 | Kazumichi Fujii | English | 
	
		| 15:00 - 15:15 | MIS24-21 | Morphological changes in bamboo with nitrogen saturation | Yuki Aihara Keisuke Koba
 Muneoki Yoh
 | Yuki Aihara | English | 
	
		| 15:15 - 15:30 | MIS24-22 | Effect of nitrogen fixation activity on green needle decomposition of Japanese cedar | Keizo Hirai Takashi Yamanaka
 Kenji Ono
 other
 | Keizo Hirai | English | 
	
		| 15:30 - 15:45 | MIS24-23 | Proton budgets for a Japanese cedar stand and a Japanese red pine stand receiving high nitrogen deposition | Takashi Wakamatsu Kazou Sato
 Akira Takahashi
 other
 | Takashi Wakamatsu | English | 
	
		| 15:45 - 16:00 | MIS24-24 | Factors influencing spatial distribution of soil nitrogen dynamics in a natural mixed forest stand in northern Japan | Takahiro Inoue FUKUZAWA karibu
 YOSHIDA toshiya
 other
 | Takahiro Inoue | English | 
	
		| Presentation No | Title | Author | Presenter | Abstract | 
	
		| Poster Presentation   May 23  Core Time (18:15-19:30) Convention Hall                    to the top | 
	
		| MIS24-P01 | Dissolved iron concentration in rivers throughout Japan and GIS analysis of its geographical factors | Atsushi Masaki Takeo Onishi
 Takayuki Shiraiwa
 other
 | Muneoki Yoh | English | 
	
		| MIS24-P02 | Humic Substances Affect Growth of the Marine Phytoplankton Cultures | Koji Fukuzaki Takahito Yoshioka
 Kanako Naito
 other
 | Koji Fukuzaki | English | 
	
		| MIS24-P03 | Input-output budgets and internal fluxes of dissolved materials in tropical rainforest catchment of Malaysian Borneo | Naoyuki Yamashita Sase, Hiroyuki
 KOBAYASHI, Ryo
 other
 | Naoyuki Yamashita | English | 
	
		| MIS24-P04 | Origin and composition of organic matter in a brackish lagoon by elemental and isotopic techniques | Kenta WATANABE Shigeru MONTANI
 Tomohiro KUWAE
 | Kenta WATANABE | English | 
	
		| MIS24-P05 | Spectral characteristics of chromophoric dissolved organic matter in the western North Pacific | Youhei Yamashita Yuichi Nosaka
 Koji Suzuki
 other
 | Youhei Yamashita | English | 
	
		| MIS24-P06 | Contribution of heterotrophic bacteria for degradation process of organic carbon in the ocean | Yuya Tada | Yuya Tada | English | 
	
		| MIS24-P07 | Linking temperature sensitivity of decomposition with substrate quality and microbial physiology | Rota Wagai | Rota Wagai | English | 
	
		| MIS24-P08 | Detecting 15N records in paleo-laminaria specimen; Evidence of herrings derived DIN to the west coast of Hokkaido, Japan | Takanori Kuribayashi ABE, Tsuyoshi
 MONTANI, Shigeru
 | Takanori Kuribayashi | English | 
	
		| MIS24-P09 | Spatio-temporal variation of phosphate concentration at river mouths in the Lake Hachiro watershed, Akita, Japan | Atsushi Hayakawa Satomi Ikeda
 Yuichi Ishikawa
 other
 | Atsushi Hayakawa | English | 
	
		| MIS24-P10 | Relationship between the coastal Blue Carbon and atmospheric CO_{2} | Tatsuki Tokoro KUWAE, Tomohiro
 | Tatsuki Tokoro | English | 
	
		| MIS24-P11 | Influence of surface flow on nitrogen discharge processes from a forested watershed | Tatsuro Kugo Ken'ichi Osaka
 II, Yumi
 other
 | Tatsuro Kugo | English | 
	
		| MIS24-P12 | Difference of water quality of rivers between the affected by polluted air from urban area and the environed by mountain | Yusuke Machida Kenichi Satake
 | Yusuke Machida | English | 
	
		| MIS24-P13 | Observation of vertical profiles of nitrogen oxides and ozone in two forest sites at the foot of Mt Fuji | Yuki Hida Yusuke Moriyama
 Ryuichi Wada
 other
 | Yuki Hida | English | 
	
		| MIS24-P14 | Seasonal pattern of nitrogen uptake by Sasa dwarf bamboo in a cool-temperate forest in northern Hokkaido | Karibu Fukuzawa | Karibu Fukuzawa | English | 
	
		| MIS24-P15 | Changes in biochemical characteristics of extractable organic matter during litter decomposition | Satoru Hobara HASEGAWA, Yuki
 OSONO, Takashi
 | Satoru Hobara | English | 
	
		| MIS24-P16 | The processes of transformation and emission of nitrite in the forest soil | Megumi Kuroiwa ISOBE, Kazuo
 KOBA, Keisuke
 other
 | Megumi Kuroiwa | English | 
	
		| MIS24-P17 | Nitrogen mineralization rates in forest soils in Japanese archipelago - Soil chemical properties - | Rieko Urakawa OHTE, Nobuhito
 SHIBATA, Hideaki
 other
 | Rieko Urakawa | English | 
	
		| MIS24-P18 | Deer-induced degradation of understory vegetation affects N retention and loss in forested watershed | Keitaro Fukushima SAKAI, Masaru
 SAKAGUCHI, Shota
 other
 | Keitaro Fukushima | English | 
	
		| MIS24-P19 | Nitrate discharge from an N-rich forest in central Japan: A preliminary isotopic diagnose of rainfall events | Xueyan Liu Keisuke Koba
 Akiko Makabe
 other
 | Xueyan Liu | English | 
	
		| MIS24-P20 | Emissions of nitrous oxide and methane in temperate forests with different nitrogen status in central Japan | Shaoyan Fan Keisuke Koba
 Muneoki Yoh
 | Shaoyan Fan | English | 
	
		| MIS24-P21 | Measurement of concentrations and isotope ratios of nitrite in acidic forest soils | Shuichiro Matsushima Keisuke Koba
 Akiko Makabe
 other
 | Shuichiro Matsushima | English | 
	
		| MIS24-P22 | Extractable amino sugar-like N in forest soils | Ryo Kobayashi Keisuke Koba
 Akiko Makabe
 other
 | Ryo Kobayashi | English | 
	
		| MIS24-P23 | Optical characterization of  DOM in a temperate forest ecosystemsby fluorescence | Hiroyu Kato Keisuke Koba
 | Hiroyu Kato | English | 
	
		| MIS24-P24 | Carbon allocation in Japanese cedar forests with different nitrogen deposition in northern Kanto district | Yoshiyuki Inagaki INAGAKI, Masahiro
 HASHIMOTO, Toru
 other
 | Yoshiyuki Inagaki | English | 
	
		| MIS24-P25 | Silicon cycle in moso bamboo ({i}Phyllostachys pubescens{/i}) forests in central Japan | Mitsutoshi Umemura Chisato Takenaka
 | Mitsutoshi Umemura | English | 
	
		| MIS24-P26 | Carbonized wood for atmospheric mercury, passive sampler | Akihiro Okuma Nobuko Ono
 Kenichi Satake
 | Akihiro Okuma | English |