Dynamics of phosphorus fractions and bioavailability in a large shallow tropical lake characterized by monotonal flood pulse in Southeast Asia

Sovannara Uk*, Heejun Yang, Theng Vouchlay, Sok Ty, Siev Sokly, Try Sophal, Oeurng Chantha, Yoshimura Chihiro

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

4 被引用数 (Scopus)

抄録

This study aims to investigate how the hydrological phase in a flood pulse dominated system, Tonle Sap Lake (TSL), affects the chemical form and bioavailability of P. For this purpose, we conducted extensive field campaigns under different hydrological phases: low-water (LW), rising-water (RW), high-water (HW), and falling-water (FW) phases from December 2016 to September 2017. The TSL ecosystem distinctly exhibited seasonality of the monotonal flood pulse between the low-water and high-water periods, in terms of not only water depth (range 0.5–8.0 m) but also water quality, suspended sediment, P dynamics (concentration, speciation and bioavailability), and trophic status. On an annual basis, the lake retained 56.2% of the external P loads, representing a major sink of P. Seasonally, P dynamics in TSL are determined by internal loading, whereas the annual inflows from the Mekong River basin and lake's tributaries are important sources of P for TSL. Total particulate phosphorus (TPP) constituted >60% of the total P in LW and decreased to <30% during HW, corresponding to the variation in total suspended solids (TSS). Soluble reactive P predominated the total dissolved P during LW (>70%) and decreased to approx. 30% during HW with decreasing TSS and TPP, suggesting the reduction of bioavailability of P in HW. Our results indicate that the flood pulse plays an important role in the chemical form and bioavailability of P in shallow lakes.

本文言語英語
ページ(範囲)944-960
ページ数17
ジャーナルJournal of Great Lakes Research
48
4
DOI
出版ステータス出版済み - 2022/08

ASJC Scopus 主題領域

  • 生態、進化、行動および分類学
  • 水圏科学
  • 生態学

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