Neighboring trees affect ectomycorrhizal fungal community composition in a woodland-forest ecotone
Neighboring trees affect ectomycorrhizal fungal community composition in a woodland-forest ecotone
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DOI：
10.1007/s00572-008-0185-2
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发表时间：
2008-09-01
期刊：
影响因子：
3.9
通讯作者：
Gehring, Catherine A.
中科院分区：
文献类型：
--
作者：
Hubert, Nathaniel A.;Gehring, Catherine A.
外生菌根真菌 (EMF) 通常种类丰富且功能多样；然而，我们对影响当地电磁场多样性和物种组成的环境因素的了解仍然很少。特别是，人们对邻近植物对 EMF 群落结构的影响知之甚少。我们测试了以下假设：具有异种邻居的植物的 EMF 在物种丰富度和群落组成方面与具有同种邻居的植物的 EMF 不同。我们在美国亚利桑那州北部的松 (Pinus edulis) - 杜松 (Juniperus monosperma) 林地和黄松 (Pinus ponderosa) 森林之间的交错带进行了研究，那里的优势树木与 EMF（P. edulis 和 P. ponderosa）或丛枝菌根真菌（AMF；J. monosperma）形成了关联。我们还比较了松树和黄松根际重叠处的电磁场群落。松树的 EMF 群落组成（而非物种丰富度）受到邻近 AM 杜松的显着影响，但不受邻近 EM 黄松的影响。当与松树联合生长时，与与同种松联合生长时，黄松 EMF 群落的物种组成有所不同。松树和黄松的 EMF 群落相似，其根际重叠，主要由相对丰度相似的相同物种组成。我们的研究结果表明，邻近树种的特性塑造了 EMF 群落结构，但这些影响是宿主-邻近树种组合所特有的。松树和黄松群落组成的重叠表明，这些树种可能相互充当电磁场接种物的储存库。
Ectomycorrhizal fungi (EMF) are frequently species rich and functionally diverse; yet, our knowledge of the environmental factors that influence local EMF diversity and species composition remains poor. In particular, little is known about the influence of neighboring plants on EMF community structure. We tested the hypothesis that the EMF of plants with heterospecific neighbors would differ in species richness and community composition from the EMF of plants with conspecific neighbors. We conducted our study at the ecotone between pinyon (Pinus edulis)-juniper (Juniperus monosperma) woodland and ponderosa pine (Pinus ponderosa) forest in northern Arizona, USA where the dominant trees formed associations with either EMF (P. edulis and P. ponderosa) or arbuscular mycorrhizal fungi (AMF; J. monosperma). We also compared the EMF communities of pinyon and ponderosa pines where their rhizospheres overlapped. The EMF community composition, but not species richness of pinyon pines was significantly influenced by neighboring AM juniper, but not by neighboring EM ponderosa pine. Ponderosa pine EMF communities were different in species composition when growing in association with pinyon pine than when growing in association with a conspecific. The EMF communities of pinyon and ponderosa pines were similar where their rhizospheres overlapped consisting of primarily the same species in similar relative abundance. Our findings suggest that neighboring tree species identity shaped EMF community structure, but that these effects were specific to host-neighbor combinations. The overlap in community composition between pinyon pine and ponderosa pine suggests that these tree species may serve as reservoirs of EMF inoculum for one another.