The Impacts of Fertilization on Mycorrhizal Production and Investment in Western Gulf Coast Grasslands
The Impacts of Fertilization on Mycorrhizal Production and Investment in Western Gulf Coast Grasslands
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施肥对墨西哥湾西部沿岸草原菌根生产和投资的影响
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
E. Siemann
中科院分区：
文献类型：
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作者：
S. Nijjer;W. E. Rogers;E. Siemann
摘要菌根真菌是陆地生态系统中无处不在的组成部分，可以影响植物的表现、丰度和多样性。分配给特定菌根真菌结构的模式可以为理解地下动态响应不断变化的资源提供有用的背景。具体地说，据预测，土壤养分有效性的增加有利于菌根结合率较低的植物。此外，与吸收和交换结构相比，受精有利于菌根在存储结构上的投资更高。在滨海高草草原进行了为期3年的田间试验，研究了施肥对菌根丰度和投资模式的影响。施肥显著提高了菌根总量。施肥区菌根对菌丝、菌圈和菌泡的投资分别增加了53%、252%和440%。综上所述，这些结果表明，高肥力土壤中的菌根更多地分配给内部真菌存储，这可能会给植物寄主带来成本。因此，施肥可能通过潜在地改变菌根对寄主植物的成本和收益，对地上植物群落产生重要的间接影响。
Abstract Mycorrhizal fungi are ubiquitous components of terrestrial ecosystems that can influence plant performance, abundance and diversity. Patterns of allocation to specific mycorrhizal fungal structures could provide a useful context for understanding belowground dynamics in response to changing resources. Specifically, increased soil nutrient availability has been predicted to favor plants with lower rates of mycorrhizal association. In addition, fertilization has been predicted to favor mycorrhizae with higher investment in storage structures relative to uptake and exchange structures. A 3 y field experiment was conducted in coastal tallgrass prairie to examine how fertilization affects mycorrhizal abundance and investment patterns. Fertilization significantly increased total mycorrhizal abundance. Specifically, mycorrhizal investment in hyphae, coils and vesicles were significantly increased 53%, 252% and 440% in fertilized plots, respectively. Together these results suggest that mycorrhizae in high fertility soils allocate more to internal fungal storage at a potential cost to plant hosts. Thus, fertilization could have important indirect effects on the aboveground plant community by potentially altering the costs and benefits of mycorrhizae to host plants.