Can ectomycorrhizal colonization of Pinus resinosa roots affect their decomposition?
Can ectomycorrhizal colonization of Pinus resinosa roots affect their decomposition?
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DOI：
10.1111/j.1469-8137.2011.03694.x
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
R. Koide;Christopher W. Fernandez;Matthew S. Peoples
中科院分区：
文献类型：
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作者：
R. Koide;Christopher W. Fernandez;Matthew S. Peoples
在许多森林生态系统中，细根凋落物包含大量有机碳和养分。在温带气候下，外生菌根真菌定植于许多森林植物的根部。如果外生菌根定殖影响根部分解，则可能显着影响碳固存和养分循环。真菌组织和细根可能以不同的速度分解，因此，外生菌根定殖可能加速或延缓根的分解。不幸的是，尚未对根和外生菌根真菌的分解进行比较。因此，我们比较了树脂松人工林中树脂松细根和外生菌根真菌的分解情况。我们还比较了非菌根树脂松细根与九种外生菌根真菌定殖的根的分解率。我们发现，外生菌根真菌的几种测试分离株的分解速度远远快于细根，并且根据真菌分离株的不同，外生菌根定植对根分解没有显着影响，或者显着增加了根分解。我们的结论是，外生菌根真菌群落的组成可能通过影响根分解来影响碳和养分循环。
In many forest ecosystems, fine root litter comprises a large pool of organic carbon and nutrients. In temperate climates ectomycorrhizal fungi colonize the roots of many forest plant species. If ectomycorrhizal colonization influenced root decomposition, it could significantly influence carbon sequestration and nutrient cycling. Fungal tissues and fine roots may decompose at different rates and, therefore, ectomycorrhizal colonization may either hasten or retard root decomposition. Unfortunately, no comparisons of the decomposition of roots and ectomycorrhizal fungi have yet been made. Therefore, we compared decomposition of Pinus resinosa fine roots and ectomycorrhizal fungi from a Pinus resinosa plantation. We also compared the decomposition rates of nonmycorrhizal Pinus resinosa fine roots with roots colonized by nine species of ectomycorrhizal fungi. We found that the several tested isolates of ectomycorrhizal fungi decomposed far more rapidly than the fine roots and that ectomycorrhizal colonization either had no significant effect on root decomposition or significantly increased root decomposition depending on the isolate of fungus. We conclude that the composition of an ectomycorrhizal fungal community may affect carbon and nutrient cycling through its influence on root decomposition.