Biodiversity and Decomposition in Mesic Forests: An Across-site Experimental Study of Patterns and Processes

中生森林的生物多样性和分解：模式和过程的跨地点实验研究

• 批准号: 9416819
• 负责人: David Coleman
• 金额: $ 20万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-01 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9416819&HistoricalAwards=false
• 关键词: Biodiversity; Decomposition; Mesic; Forests; Across

9416819 Coleman Studies of decomposition and nutrient cycling in ecosystems have been very important processes for the interpretation of ecosystem function. They have become "keystone" parameters in the LTER program. There has been an increasing interest in the functional roles of hundreds of species of litter- and microbial- feeding fauna which occur in virtually all terrestrial sites. How do these species operate and interact, and are they "necessary' for optimal functioning of the system? This project will explore the interaction between biodiversity and decomposition processes, by studying factors causing marked differences which have been found between three moist, warm, broad-leaved forest sites, all on similar soil types. Two tropical sites, Luquillo (LUQ) in Puerto Rico, and La Selva (LAS Rica, have low and high species richnesses of soil microarthropods, respectively. Cowetta (CWT), in the Southern Appalachian mountains, has a species richness of microarthropods approaching that of LAS. Both CWT and LUQ are in the general substrate decomposition network study currently being conducted by Harmon et al. The same or similar litter substrates to those of the Harmon et al. network, will be contained in litter bags identical to the previous study. The network will be expanded to include LAS, to test the hypothesis: forests with litters containing the most diverse litter faunas will have the most rapid decomposition rates. Conversely, forests with relatively low species richness (LUQ) will have significantly lower rates of decomposition, when corrected for differences in moisture/temperature regimes. CWT is expected to have a decomposition rate intermediate to that of the two tropical sites, because of its seasonal cycles of warm wet weather. This project uses simple, proven techniques to compare decomposition rates across sites and should be the groundwork for more widespread studies of biotic interactions and processes across the LTER network.

小行星9416819科尔曼 生态系统分解和养分循环的研究是解释生态系统功能的重要过程。 它们已成为LTER方案中的“基石”参数。 人们对几乎所有陆地地点都存在的数百种以凋落物和微生物为食的动物的功能作用越来越感兴趣。 这些物种是如何运作和相互作用的，它们对系统的最佳功能是“必要的”吗？ 该项目将探讨生物多样性和分解过程之间的相互作用，研究造成三个潮湿、温暖、阔叶林地点之间明显差异的因素，这些地点都有类似的土壤类型。 两个热带站点，波多黎各的卢基略（LUQ）和拉塞尔瓦（LAS Rica），土壤微型节肢动物的物种丰富度分别较低和较高。位于阿巴拉契亚山脉南部的考埃塔（CWT）的微型节肢动物物种丰富度接近LAS。 CWT和LUQ都在Harmon等人目前正在进行的一般底物分解网络研究中。 与Harmon等人网络相同或相似的垫料基质将包含在与先前研究相同的垫料袋中。 该网络将扩大到包括LAS，以测试假设：森林的凋落物含有最多样化的凋落物动物群将有最快的分解速度。 相反，物种丰富度（LUQ）相对较低的森林将有显着较低的分解率，在水分/温度制度的差异进行校正时。 由于气候温暖潮湿的季节性循环，预计CWT的分解率介于两个热带地点之间。 该项目使用简单、经过验证的技术来比较不同地点的分解率，应该成为更广泛地研究整个LTER网络的生物相互作用和过程的基础。