JpGU-AGU Joint Meeting 2017

講演情報

[EE] 口頭発表

セッション記号 A (大気水圏科学) » A-HW 水文・陸水・地下水学・水環境

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

2017年5月21日(日) 09:00 〜 10:30 201B (国際会議場 2F)

コンビーナ:奥田 昇(総合地球環境学研究所)、小野寺 真一(広島大学大学院総合科学研究科)、池谷 透(総合地球環境学研究所)、Adina Paytan(University of California Santa Cruz)、座長:Paytan Adina(University of California, Santa Cruz)

09:15 〜 09:30

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

*Irisse Bianca Baldovino De Jesus1Jonathan Carlo A Briones1,2,3Osbert Leo A Privaldos5Elfritzson Martin Peralta2Yoshitoshi Uehara7Takuya Ishida7Adelina Santos Borja5Francis S Magbanua4Rey Donne S Papa1,2,3Tomoya Iwata6Noboru 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)

キーワード:Tracer Addition for Spiralling Curve Characterization, Philippines, nutrient dynamics

Nitrogen and phosphorus kinetics plays an essential role in the sustainability of watersheds but their increased availability also brings adverse impacts to water quality, species diversity, human health and ecosystem balance. This study reports on nitrogen limitation in headwater streams in Silang-Santa Rosa Subwatershed (SSRS). Moreover, this is the first attempt in studying nutrient spiralling in Philippine headwater streams using Tracer Addition for Spiralling Curve Characterization (TASCC). Phosphorus uptake kinetics showed shortest uptake length (Swamb = 25.27m), highest aereal uptake rate (Uamb= 37.46 mg-P/m2/min) and uptake velocity (Vfamb = 162.12 mm/min) in an agricultural site and longest uptake length (Swamb= 109.24m), lowest aereal uptake rate (Uamb= 0.31 mg-P/m2/min) and uptake velocity ( Vfamb =2.76 mm/min) in a residential site. Nitrogen uptake showed undetected peaks that is suspected as N limitation supported by significant correlations for Uamb-P and NH3 (R=0.919, 95%) and N:P ratio (0.4923). Overall, this research aids in the Philippine land use planning and watershed management for ecological sustainability and serves as a contribution in tropical studies particularly in nutrient dynamics.