Effect of mycorrhizal strategy on net primary productivity of trees in global forest ecosystem
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, mycorrhizal symbioses, including seven types varied between host species and fungal taxa, play key roles in important ecosystem processes and functions. To enhance our understanding of the functional diversity of mycorrhizal associations, we analyzed the impact of mycorrhizal strategies on net primary productivity (NPP) on the global scales based on a global forest database. The results showed that the NPP of trees varied with the differences of mycorrhizal strategy at the global forest ecosystem. When the different mycorrhizal strategy was considered, the NPP of trees was higher in arbuscular mycorrhizas (AM) dominated forest with a mean of C 679.49 g-m-2a-1 than in ectomycorrhizas (ECM) dominated forest with a mean of C 479.00 g·m-2·a-1. The response of above-and below-ground NPP of trees also highly varied among different mycorrhizal strategies. AM contributed more to below-ground NPP than above-ground when compared with ECM. It was contrary of the effects of ECM. In addition, mycorrhizal strategy affected significantly the NPP of leaf, stem, branch, and coarse and fine root AM increased the NPP of leaf and fine root, and ECM enhanced the NPP of stem and branch. We conclude that the total NPP and NPP of their different parts were significantly different with the variation of mycorrhizal strategies.
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