Soil fungal networks moderate density-dependent survival and growth of seedlings.
Soil fungal networks moderate density-dependent survival and growth of seedlings.
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DOI：
10.1111/nph.17237
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发表时间：
2021-01
期刊：
影响因子：
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通讯作者：
Minxia Liang;Liuqing Shi;D. Burslem;David Johnson;Miao Fang;Xinyi Zhang;Shixiao Yu
中科院分区：
文献类型：
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作者：
Minxia Liang;Liuqing Shi;D. Burslem;David Johnson;Miao Fang;Xinyi Zhang;Shixiao Yu
致病性和互利互惠的真菌有对比的影响，幼苗建立，但目前还不清楚是否密度依赖的生存和生长调节访问不同类型的菌根真菌网络支持相邻的成年树木。在这里，我们进行了广泛的实地调查，以测试如何在亚热带森林的丛枝菌根（AM）和外生菌根（ECM）幼苗的菌根和病原真菌的定殖密度相邻的成年树木。此外，我们进行了菌丝排斥实验，明确测试土壤真菌网络的作用，在驱动密度依赖的影响幼苗生长和存活。同种成人密度是一个强有力的预测相对丰富的推定病原体，这是更大的AM比ECM幼苗的根，而菌根真菌丰度和定植不一致的影响同种成人密度。ECM和AM真菌网络都能抵消密度依赖的同种死亡率，但ECM真菌比AM真菌更能有效地削弱高密度的负面影响。我们的研究结果揭示了常见的真菌网络在减轻病原真菌对幼苗建立的负面密度依赖性影响方面的关键作用，这为土壤真菌多样性如何塑造亚热带森林中的植物群落结构提供了机制见解。
Pathogenic and mutualistic fungi have contrasting effects on seedling establishment, but it remains unclear whether density-dependent survival and growth are regulated by access to different types of mycorrhizal fungal networks supported by neighbouring adult trees. Here, we conducted an extensive field survey to test how mycorrhizal and pathogenic fungal colonization of arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) seedlings in a subtropical forest respond to density of neighbouring adult trees. In addition, we undertook a hyphal exclusion experiment to explicitly test the role of soil fungal networks in driving density-dependent effects on seedling growth and survival. Conspecific adult density was a strong predictor for the relative abundance of putative pathogens, which was greater in roots of AM than ECM seedlings, while mycorrhizal fungal abundance and colonization were not consistently affected by conspecific adult density. Both ECM and AM fungal networks counteracted conspecific density dependent mortality, but ECM fungi were more effective at weakening the negative effects of high seedling density than AM fungi. Our findings reveal a critical role of common fungal networks in mitigating negative density-dependent effects of pathogenic fungi on seedling establishment, which provides mechanistic insight into how soil fungal diversity shapes plant community structure in subtropical forests.