[A-HW32] [EE] Biodiversity, nutrients and other materials in ecosystems from headwaters to coasts

Sun. May 21, 2017 9:00 AM - 10:30 AM 201B (International Conference Hall 2F)

convener:Noboru Okuda(Research Institute for Humanity and Nature), Shin-ichi Onodera(Graduate School of Integrated and Arts Sciences, Hiroshima University), Tohru Ikeya(Research Institute for Humanity and Nature), Adina Paytan(University of California Santa Cruz), Chairperson:Adina Paytan(University of California Santa Cruz)

This session aims to synthetize watershed sciences in order to understand dynamical processes of interactions between organisms, nutrients and other materials in watersheds from mountain tops to receiving water. The session will be integrating a variety of research disciplines including limnology, pedology, ground water hydrology, sedimentology, coastal oceanography, meteorology, forestry, agriculture, fishery and more. The watershed sciences also challenge us to solve environmental issues emerged in the watersheds through our profound understanding of relations between humanity and nature in social-ecological systems. For instance, on one hand, human land uses alter dynamics of sediments, macro- and micro-nutrients and pollutants in soils and waters on catchment scales, while changing climates may alter the frequency and intensity of natural disaster, sometimes having catastrophic effects on the watershed systems. On the other hand, globalization causes transboundary pollution and biological invasion between watersheds. Such anthropogenic disturbances, in turn, reduce biodiversity and thus deteriorate its ecosystem services in watersheds and coasts, posing a risk to sustainable human development. The dogma of watershed sciences may lead us to the solution for sustainable future of social-ecological watershed systems as the basis of our existence. This session also calls for ideas on new methods for the watershed sciences, such as tracer and molecular technique, modeling and paleontological approaches, laboratory and field experiments, and so on, in order to elucidate biological, chemical and physical mechanisms for shedding light on natural phenomena and their changes over time in complex and dynamic watershed systems. Through this session, we would like to facilitate interdisciplinary collaboration among participants to create new knowledge on watershed sciences.

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9:00 AM - 9:15 AM

[AHW32-07] Nitrogen and phosphorus dynamics in two Japanese river networks with contrasting watershed land use

*Tomoya Iwata¹, Takuya Hayashi², Masanori Akashi², Aya R. Murakami³, Noboru Okuda⁴ (1.Faculty of Life and Environmental Sciences, University of Yamanashi, 2.Faculty of Engineering, University of Yamanashi, 3.Center for Ecological Research, Kyoto University, 4.The Research Institute for Humanity and Nature)

9:15 AM - 9:30 AM

[AHW32-08] Quantification of phosphorus and nitrogen uptake in a tropical freshwater ecosystem in Southeast Asia suggests N limitation

*Irisse Bianca Baldovino De Jesus¹, Jonathan Carlo A Briones^1,2,3, Osbert Leo A Privaldos⁵, Elfritzson Martin Peralta², Yoshitoshi Uehara⁷, Takuya Ishida⁷, Adelina Santos Borja⁵, Francis S Magbanua⁴, Rey Donne S Papa^1,2,3, Tomoya Iwata⁶, Noboru Okuda⁷ (1.University of Santo Tomas (UST) - Graduate School, 2.UST - Research Center for Natural and Applied Sciences, 3.UST - College of Science, 4.University of the Philippines, Diliman - Institute of Biology, 5.Laguna Lake Development Authority, 6.University of Yamanashi - Faculty of Life and Environmental Sciences, 7.Research Institute for Humanity and Nature)

9:30 AM - 9:45 AM

[AHW32-09] The quantitative evaluation of bio-available particulate phosphorus discharged from Yasu River.

*Ken'ichi Osaka¹, Shinsho Chishiro², Tomoya Iwata³, Noboru Okuda⁴ (1.School of ecosystem study, University of Shiga Prefecture, 2.Graduate School of Environmental Science, University of Shiga Prefecture, 3.Faculty of Environmental Science, University of Yamanashi, 4.Research Institute for Humanity and Nature)

9:45 AM - 10:00 AM

[AHW32-10] Biogeochemical cycling of phosphate in the Yasu River Watershed: Insight from oxygen isotope of phosphate

*Takuya Ishida¹, Yoshitoshi Uehara¹, Tomoya Iwata², Osberet Privaldos³, Satoshi Asano¹, Tohru Ikeya¹, Ken'ichi Osaka⁴, Jun'ichiro Ide⁵, Ichiro Tayasu¹, Noboru Okuda¹ (1.Research Institute for Humanity and Nature, 2.University of Yamanashi, 3.Laguna Lake Development Authority, 4.University of Shiga Prefecture, 5.Kyushu University)

10:00 AM - 10:15 AM

[AHW32-11] Comparisons of oxygen isotope ratio of phosphate in river water and rocks between two watersheds in central Japan

*Jun'ichiro Ide¹, Abigail P. Cid-Andres², Takuya Ishida³, Ken'ichi Osaka⁴, Tomoya Iwata⁵, Takuya Hayashi⁵, Masanori Akashi⁵, Ichiro Tayasu³, Noboru Okuda³ (1.Institute of Decision Science for a Sustainable Society, Kyushu University, 2.Osaka University, 3.Research Institute for Humanity and Nature, 4.Department of Ecosystem Studies, University of Shiga Prefecture, 5.Faculty of Life and Environmental Sciences, University of Yamanashi)

10:15 AM - 10:30 AM

[AHW32-12] Transportation mechanism of arsenic (As), cesium (Cs) with iron (Fe) from river to paddy rice through irrigation in river water system

*Shinji Nakaya¹, Mistunori ISHIKAWA¹, Kengo MURODA¹, Harue Masuda² (1.Department of Water Environment and Civil Engineering, Faculty of Engineering, Shinshu University, 2.Osaka City University)

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