DISSERTATION RESEARCH: Aquatic effects of a terrestrial invasion: a riparian tree subsidizes carbon and nitrogen with differential consequences for stream ecosystem function

论文研究：陆地入侵对水生的影响：河岸树木补贴碳和氮，对溪流生态系统功能产生不同的影响

• 批准号: 0910367
• 负责人: Colden Baxter
• 金额: $ 1.5万
• 依托单位: Idaho State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0910367&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Aquatic; effects; terrestrial

Dissertation Research: Aquatic effects of a terrestrial invasion: a riparian tree subsidizes carbon and nitrogen with differential consequences for stream ecosystems. Invasive species can affect ecosystem functions such as productivity or processing of nutrients. These effects can beyond the habitat where the invasion occurs extend. The goal of this research is to evaluate the effects of an invasive non-native tree species (Russian olive, Elaeagnus angustifolia) on aquatic ecosystem processes. Unlike the native riparian vegetation that it replaces, Russian olive is able to fix nitrogen (N) transforming it into a form usable by itself and other plants. As a result, Russian olive trees can supply N to streams, altering nutrient uptake and algal growth. This altered processing of N in streams could result in greater export of N from invaded watersheds to downstream systems which could result in nutrient pollution problems. Research funded by this award will evaluate if this effect of Russian olive is manifested at a regional scale by comparing measurements of nitrogen input and biological demand for N in 10 invaded and 10 non-invaded streams in the Intermountain-West region. Little is known about how invasive species affect the exchange of nutrients and food sources to adjacent ecosystems. If Russian olive alters N processing in streams this could represent a major unforeseen effect of riparian plant invasions. The results from this research will inform management of Russian olive which is in its infancy, despite the invasion's extent and potential impacts. The investigators will include undergraduate researchers and will mentor a high school intern from the nearby Shoshone-Bannock reservation where some of this work will be conducted. This study will address water quality and human health concerns affecting rural communities in the West. Results of this research will be communicated broadly to the scientific community, local managers and the general public.

论文研究：陆地入侵的水生效应：河岸树对河流生态系统碳和氮的不同影响。入侵物种会影响生态系统的功能，如生产力或营养物质的加工。这些影响可以超出发生入侵的栖息地。本研究的目的是评估外来入侵树种（俄罗斯橄榄，沙枣）对水生生态系统过程的影响。与它所取代的原生河岸植被不同，俄罗斯橄榄能够固定氮（N），将其转化为自身和其他植物可用的形式。因此，俄罗斯橄榄树可以为溪流提供氮，改变营养吸收和藻类生长。这改变了处理的N流可能会导致更多的出口N从入侵流域下游系统，可能会导致营养污染问题。该奖项资助的研究将评估俄罗斯橄榄的这种影响是否在区域范围内表现出来，通过比较山间西部地区10条入侵和10条非入侵溪流的氮输入和氮生物需求的测量结果。人们对入侵物种如何影响邻近生态系统的营养物质和食物来源的交换知之甚少。 如果俄罗斯橄榄改变N处理流，这可能是一个重大的河岸植物入侵的不可预见的影响。这项研究的结果将为俄罗斯橄榄的管理提供信息，尽管入侵的程度和潜在影响尚处于起步阶段。调查人员将包括本科研究人员，并将指导来自附近肖松-班诺克保留地的一名高中实习生，其中一些工作将在那里进行。这项研究将解决影响西部农村社区的水质和人类健康问题。这项研究的结果将广泛传达给科学界、当地管理人员和公众。