Dissertation Research: Impact of Differential Leaf Decomposition Rates and Invertebrate Shredders on Stream Nutrient Uptake Length

论文研究：差异叶片分解率和无脊椎动物粉碎机对溪流养分吸收长度的影响

• 批准号: 8719571
• 负责人: Jackson Webster
• 金额: $ 1.01万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8719571&HistoricalAwards=false
• 关键词: Dissertation; Research; Impact; Differential; Leaf

Nutrient uptake length, the distance traveled by a nutrient atom before being biotically or abiotically removed from solution, provides an index of stream retention and therefore has implications concerning production and efficiency. Previous studies found an inverse relationship between quantity of course particulate organic matter (CPOM) in the stream and nutrient uptake length. It is hypothesized that in addition to CPOM quantity, microbial colonization patterns and breakdown rates of CPOM are also important in regulating uptake length. This hypothesis will be tested by constructing nine artificial streams and conducting two 6-8 month long experiments. In experiment 1, three leaf types with different microbial colonization patterns and breakdown rates will be used. One leaf type will be placed in each stream (three replicates of each leaf type) and nutrient uptake length will be measured biweekly for several months. In experiment 2, a mixture of leaf types will be placed in each stream. Leaf shredding invertebrates will be placed in some streams and excluded from others to determine how shredding affects nutrient uptake through its impact on microbial activity and breakdown rates. A lab experiment will be done concurrent with field work to determine the relative importance of biotic and abiotic uptake.

养分吸收长度，即养分原子移动的距离 在从溶液中生物或非生物除去之前， 提供了流保留指数，因此具有 影响生产和效率。 先前 研究发现， 河流中的颗粒有机物（CPOM）和营养盐 吸收长度 据推测，除了CPOM之外， 数量、微生物定植模式和分解率 CPOM在调节摄取长度方面也很重要。 这 将通过构建九条人工溪流来验证假设 并进行了两次为期6-8个月的实验。 在实验1中， 三种叶型具有不同的微生物定殖模式 并将使用细分率。 将放置一个叶类型 在每个流（每种叶型三个重复）和营养 摄取长度将每两周测量一次，持续数月。 在 实验2，叶类型的混合物将被放置在每个 源源不断的 碎叶无脊椎动物将被放置在一些 流和排除从其他人，以确定如何粉碎 通过影响微生物活性来影响养分吸收 和故障率。 将同时进行实验室实验 通过实地工作来确定生物的相对重要性 和非生物吸收。