典型高原湖泊无机还原态磷(IRP)内生与迁移过程及其生态环境效应

无机还原态磷(IRP)具有极强的迁移性和活性, 在湖泊磷循环中发挥不可替代作用。高原湖泊强烈的环境变异导致水体持续缺氧现象加剧, 这将非常易于IRP产生和迁移, 进而深刻影响湖泊生态环境。然而, 由于传统理论和方法“缺失”, 造成对高原湖泊IRP生物地球化学过程与生态环境响应机制缺乏明确的认识。本项目以深水寡营养抚仙湖和浅水富营养星云湖两种典型高原湖泊为研究区域, 以自主研发的多种原位分析方法为依托，从宏观尺度明确高原湖泊多介质中IRP组成的时空分布特征; 通过室内模拟和野外原位追踪监测, 定量辨识高原湖泊的IRP迁移路径和形成过程, 解析密切因子, 揭示高原湖泊IRP的内生机制; 进一步探讨高原湖泊IRP对水体营养结构影响及其潜在生态效应,为深入认识高原湖泊磷的生物地球化学循环及其生态环境效应提供科学理论依据。

It has been identified the reduced inorganic phosphorus compounds (IRP) as playing an irreplaceable and important role in lake P cycle due to their high migration and activity. Currently, the intense environmental variations of plateau lakes have been making the aggravation of continuous hypoxia, which is very propitious to the generation and migration of IRP. Due to long-term “absences” of traditional theories and methods, however, our knowledge on the IRP biogeochemical processes and their eco-environmental effects in plateau are still limited. In this project, the deep oligotrophic Lake Fuxian and shallow eutrophic Lake Xingyu are chosen to be studied as two typical plateau lakes. Based on the self-established in-situ monitoring methods, the spatial and temporal distributions of IRP from two target lakes will be firstly studied at the macroscopic scale. The IRP migration and generation processes, as well as their closely correlated factors, will be quantitatively identified, and then analyzed for the endogenetic mechanisms of IRP generation in plateau lakes, by the combination of in-situ field investigations and laboratory simulation experiments. Finally, the effects of IRP on the water nutrient structure and potential ecosystem of plateau lakes will be preliminarily studied and discussed. It is expected that those results will provide the scientific evidences and theoretical supports for our deeply understanding of P biogemchemical cycle and its eco-environmental effects in the plateau lakes.