LTER: Microbial Ecology of Ectomycorrhizal Mats in a Douglas-Fir Ecosystem

至少两种外生菌根真菌， 和Gautieria monticola在土壤中形成广泛的菌丝垫 产于太平洋西北部的针叶林。 其他 Hysterangium物种在针叶和针叶树中形成类似的垫， 落叶林，包括H.加德内里因 与桉树的关系 初步研究表明， 表明，根际群落占主导地位的 前两种真菌的微生物生物量显着增加， 呼吸速率和七种酶的水平变化 有机物分解时相比，邻近 非殖民化土壤 由于这些垫子提供离散单元， 研究外生真菌对微生物生态的影响 的根际群落，我们建议比较上述 三个垫社区与未殖民化的土壤方面：真菌 以及细菌生物量、群落呼吸和酶 活动;氮和磷的分配到 不稳定和不稳定的游泳池;垫化学对 酶活性;通过纯真菌培养物的酶生产;和 酚偶联酶在根际过程中的作用。

At least two ectomycorrhizal fungi, Hysterangium setchellii and Gautieria monticola, form extensive hyphal mats in the soils of coniferous forests of the Pacific Northwest. Other Hysterangium species form similar mats in coniferous and deciduous forests throughout the world, including H. gardneri in association with Eucalyptus. Preliminary research has demonstrated that the rhizosphere communities dominated by the first two fungi have significantly elevated microbial biomass, respiration rates and altered levels of seven enzymes responsible for organic matter decomposition when compared to adjacent uncolonized soils. Since these mats offer discrete units to study the influence of ectomycorrhizae on the microbial ecology of the rhizosphere community, we propose to compare the above three mat communities with uncolonized soils in terms of: fungal and bacterial biomass, community respiration and enzyme activities; the partitioning of nitrogen and phosporus into labile and recalcitrant pools; the effects of mat chemistry on enzyme activities; enzyme production by pure fungal cultures; and the role of phenolic-coupling enzymes in rhizosphere processes.