Influence of mycorrhizal fungi on soil respiration
Soil, as a main part of terrestrial ecosystem, is one of the planet's largest carbon reserves, and soil respiration is one of the largest CO_2 fluxes from terrestrial biosphere to the atmosphere. The slim change of soil respiration will lead to the dramatic fluctua-tion of the atmospheric CO_2 concentration. In terrestrial ecosystems, symbiotic associations between plant roots and mycorrhizal fungi are near ubiquitous, with 90 per cent of all plant species forming mycorrhizas. At the global scale, although there are seven type mycorrhizas, plants with arbuscular mycorrhizas (AM) and Ectomycorrhizas (EM) are the dominant components of the major world biomes today. A few studies have testified that mycorrhizas including AM and EM play indispensable role in soil respiration while it is difficult to be determined. The advances in the influence on mycorrhizas to soil respiration were summarized in this paper. The results have shown that mycorrhizas have greater enhancement on the soil respiratory and minor influence on temperature sensitivity (Q_(10))-The possible ways included (1) to improve the respiration of plant roots, (2) to consider mycorrhizas as a component of respi-ration, and (3) to enhance the respiration in bulk soil. Furthermore, the mycorrhizal function in soil respiration is affected by all kinds of factors including biotic and abiotic factors. Mycorrhizal external hyphae expressed the acclimation to the temperature. The reports about the mycorrhizal contribution to soil respiration are by far comparatively few. Recently, the key role of mycorrhizas in soil res-piration has been gradually recognized, It will be helpful for us to predict the CO_2 flux from soil during the climatic changes if my-corrhizal roles in soil respiration are examined properly.
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