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生态学报  2004 

Effects of nitrogen deposition on ectomycorrhizal fungi
氮沉降对外生菌根真菌的影响

Keywords: N deposition,effect,ectomycorrhizal fungi
氮沉降
,影响,外生菌根真菌,临界负荷

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Abstract:

As a result of increasing anthropogenic nitrogen deposition, N availability in many forest ecosystems, which are normally N-limited, has been enhanced. Increased N availability may impact the ectomycorrhizal fungi (EMF) that are generally regarded as an adaptation to nutrient limited conditions. Based on available scientific knowledge the effects of nitrogen deposition on ectomycorrhizal fungi, including the formation of EMF, the change of extraradical mycelium and mycorrhizal, the productivity of the fruiting bodies and EMF structure are reviewed in this paper. The potential impacts were related to the following three aspects. Elevated nitrogen deposition would (1) affects the nutrient allocation and cycle between EMF and autoecious trees; (2) lead to a reduction of the productivity of fruit body, of the production of extraradical mycelium in soil, of the ectomycorrhizal fungal sporocarp abundance, and of the numbers and the productivity of mycorrhizal; (3) change structure and the function of the ectomycorrhizal fungal community. The critical load of forest nitrogen saturation and future research on EMF is also discussed in this paper.

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