Log Decomposition Processes as Influenced by Heterotroph Community Structure

详细的过程一级和社区一级研究将 这是一个长期的， 以俄勒冈州的H. J. Andrews LTER站点为中心的对数衰减研究。 具体而言，本研究将重点完成三项研究 任务 首先，一项为期两年的营养动态研究， 各种腐烂的原木将被完成。 有关变化的数据 原木的养分含量将与信息集成， 通过诸如固氮作用等过程的养分输入， 以及通过破碎和沥滤等过程的产出。 第二，将研究1985年野外设置的测井曲线，以确定 固氮作用，真菌群落分布与酶 与分解者社区相关的活动。 蒂瑟福尔 将完成对原木腐烂季节性模式的研究。和 第三，测定原木中萜类和酚类的含量 1985年，将完成。 其中一些化合物被认为 用作钻木昆虫的引诱剂和/或 作为分解的抑制剂。 这项研究的意义在于它将帮助我们 了解对数衰减在养分循环中的作用， 森林生态系统 在太平洋古老的森林里 西北部，倒下的原木和其他木质残体占22% 地上有机物质（活的和死的有机物质）， 81%的地上碎屑。 这一大片枯死的树木 物质可以作为重要的营养物质仓库 and regulator调节of nutrition营养dynamics动态in these forest森林systems系统. 肖沃尔特博士和他的同事们有着良好的生产力记录 in this research研究area区. 可提供的机构资源， 他们是上级的。

Detailed process-level and community-level studies will beconducted on decomposing logs that are part of a long-term logdecay study centered at the H.J. Andrews LTER site in Oregon. Specifically, the research will focus on completing threeresearch tasks. First, a two-year study of nutrient dynamics infour species of decaying logs will be finished. Data on changesin nutrient content of the logs will be integrated withinformation on nutrient inputs through processes such as nitrogenfixation, and outputs through processes such as fragmentation andleaching. Second, logs set in the field 1985, will be studied todetermine nitrogen fixation, fungal community distribution andenzyme activity associated with the decomposer community. Thiseffort will complete a study of seasonal patterns in log decay. And third, analyses of terpene and phenol content of the logs setout in 1985, will be completed. Some of these compounds arethought to serve as attractants for wood-boring insects and/or asinhibitors of decomposition. The significance of this research is that it will help us tounderstand the role of log decay in nutrient cycling in forestecosystem. In old-growth forests of the Pacific Northwest,downed logs and other woody debris comprise up to 22% of above-ground organic mass (live and dead organic matter) and 81% ofaboveground detritus. This large mass of dead woody material maywell serve as an important storehouse of nutrients and regulatorof nutrient dynamics in these forest systems. Dr. Showalter and his colleagues have good records ofproductivity in this research area. The institutional supportavailable to them is superior.