Water and Chemical Budgets for Two Tropical Rainforest Watersheds (SGER)

这里提出的短期项目的目标是在哥斯达黎加的La Selva生物站建立并开始监测第一个永久性的、高质量的流量测量站点，这是在中美洲迅速消失的低地热带雨林中研究得最好（就生态学而言）和装备最好的实地研究站。所得资料将用于：为La Selva的两个小流域编制第一个高质量的水文预算（这方面对时间很敏感，因为它依赖于与其他研究人员正在进行的降雨和蒸散发测量相联系，这些测量由其他研究人员进行，并在特定时期内得到资助），检验完全由地球化学数据产生的水文假设；其中一个流域的很大一部分流量是高溶质地热地下水进入流域的地下盆地间转移的结果，开始为流域生产化学预算（投入和产出），认识到部分投入可能在地下（我们期望上述关于地热地下水的假设被接受），开始初步；定量评估是否存在显著的生态差异，这些差异可以可靠地归因于流域之间的水文差异（这依赖于乔治亚大学凯瑟琳·普林格尔在单独资助下开展的生态工作）。

9800129 Genereux The goal of the short-term project proposed here is to establish and begin monitoring the first permanent, high-quality streamflow measurement sites at La Selva Biological Station in Costa Rica, the best-studied (with respect to ecology) and best-equipped field research station in the rapidly disappearing lowland tropical rainforest of Central America. The data will be used to: produce the first high-quality hydrologic budgets for two small watersheds at La Selva (this aspect is time-sensitive, in that it relies on linking up with ongoing measurements of rainfall and ET which are being carried out by other researchers and are funded for a specific period of time) test the hydrologic hypothesis, generated solely from geochemical data, that a significant portion of streamflow on one of the watersheds is the result of subsurface interbasin transfer of high-solute geothermal groundwater into the watershed begin production of chemical budgets (input and output) for the watersheds, recognizing that part of the input is probably in the subsurface (we expect the hypothesis above concerning geothermal groundwater to be accepted) begin preliminary, quantitative assessment of whether there are significant ecological differences that can be reliably attributed to hydrologic differences between the watersheds (this relies on ecological work being carried out by Catherine Pringle at the University of Georgia with separate funding).