The effects of above- and below-ground interaction on the productivity in a deciduous broad-leaved forest.

地上和地下相互作用对落叶阔叶林生产力的影响。

基本信息

批准号：
15208014
负责人：
HIURA Tsutomu
金额：
$ 24.71万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

1.In this project, we clarified some links among the species diversities of producer, consumer, and decomposer with special reference to the response to environmental gradient for Quercus crispula.2.We carried out the cutting and fertilization experiment in secondary forests to reveal the community-level and ecosystem-level responses to light-nutrient resource gradient. In results, the fertilization accelerated herbivory in Quercus crispula.3.We set up the experimental plots that manipulate the density of earthworm, and examined the density effects on ecosystem function. The fact that high accumulation of litter in the low density plots suggests that the lower density of earthworm would result the lower decomposition rate although nitrogen mineralization rates were not different among manipulations at least during the two years.4.The reconstruction process of species diversity of consumer on the canopy of Quercus crispula was compared between the disturbed canopy by using canopy fogging method and non-disturbed canopy. This experiment suggest that the community of herbivorous insects is converge to single stable equilibrium depend on the quality of a leaf, while the community of detritivorous insects varies depend on the assemblage process of the species (multiple stable equilibria). We also examined the diversity of decomposer community in stands that having different tree species diversity, however, the results suggest that oribatid mite community structure was minimally affected by tree species diversity and associated changes in litter diversity.5.We manipulated fungal diversity by some sterilizations to examine the function of fungal groups by estimating mineralization, decomposition rate and growth rate of some plants. The results suggested that Basidiomycota had higher decomposition ability than Ascomycota, and mycorrhiza on Maianthemum dilatatum contributed to uptake for phosphorous and its growth.

1.在这个项目中，我们阐明了生产者，消费者和分解商的物种多样性之间的一些联系，特别提及了Quercus crispula的环境梯度的响应。2。我们在二级森林中进行了切割和施肥实验，以揭示社区级别和生态系统级对轻营养资源梯度的反应。在结果中，施肥加速了crispula的草食作用。3。我们建立了操纵earth密度的实验图，并检查了对生态系统功能的密度影响。低密度图中垃圾中垃圾的高积聚表明，worm的较低密度将导致较低的分解速率，尽管氮矿化速率至少在两年中的操作中没有差异。使用冠层雾化方法和未扰动的冠层比较了干扰冠层之间的消费者。该实验表明，草食昆虫的群落融合到单个稳定平衡取决于叶子的质量，而降解昆虫的社区则取决于物种的组合过程（多个稳定的平衡）。我们还研究了具有不同树种多样性的展位中分解群落社区的多样性，但是结果表明，Oribatid Mite社区结构受树种多样性的影响以及垃圾多样性的相关变化。通过估计某些植物的矿化，分解速率和生长速率来检查真菌群的功能。结果表明，基型菌具有比Ascomycota更高的分解能力，而在Maianthemum dilatatum上的Mycorrhiza有助于吸收磷及其生长。