Influence of Stream-Lake Interactions on Nutrient Transport and Function of Aquatic Ecosystems: Modeling, 15N Experiments and Watershed Analyses

溪流-湖泊相互作用对养分输送和水生生态系统功能的影响：建模、15N 实验和流域分析

• 批准号: 0132983
• 负责人: Wayne Wurtsbaugh
• 金额: $ 100.83万
• 依托单位: Utah State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-03-01 至 2006-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0132983&HistoricalAwards=false
• 关键词: Influence; Stream; Lake; Interactions; Nutrient

The research will address three hypotheses arising from the spatial pattern of connectivity between streams and lakes: (1) lakes are nutrient sponges, absorbing spring nutrient pulses and then slowly releasing them over the summer, thus stabilizing biological production downstream; (2) lakes reduce biological productivity downstream because nutrients are lost via sedimentation and denitrification; (3) lakes are solar collectors, thus increasing watershed temperatures and the metabolic rates of organisms. These hypotheses will be addressed in sub-alpine watersheds in the Sawtooth Mountains of Idaho using: (a) hydrological and food-web modeling; (b) releases of a tracer nutrient (15NO3) followed through the food webs of a stream-lake-stream linkage, and; (c) analyzing patterns of chemical, thermal and biological activity in three watersheds with and three without lakes. The work will be useful for eutrophication and lake fertilization studies, for the protection of endangered fishes, and for the prediction of production in streams, rivers, and lakes.

该研究将解决河流和湖泊之间连通性的空间格局所产生的三个假设：（1）湖泊是营养海绵，吸收春季营养脉冲，然后在夏季缓慢释放，从而稳定下游的生物生产力;（2）湖泊降低下游的生物生产力，因为营养物质通过沉积和反硝化作用损失;（3）湖泊是太阳能收集器，因此提高了流域温度和生物体的代谢率。这些假设将解决在亚高山流域的锯齿山的爱达荷州使用：（a）水文和食物网建模;（B）释放示踪营养素（15 NO3）随后通过食物网的流-湖-流链接，和（c）分析模式的化学，热和生物活动在三个流域和三个没有湖泊。 这项工作将有助于富营养化和湖泊施肥的研究，为保护濒危鱼类，并在溪流，河流和湖泊的生产预测。