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首页> 外文期刊>Ecosystems >Soil Fungi Respond More Strongly than Fine Roots to Elevated CO in a Model Regenerating Longleaf Pine-Wiregrass Ecosystem
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Soil Fungi Respond More Strongly than Fine Roots to Elevated CO in a Model Regenerating Longleaf Pine-Wiregrass Ecosystem

机译：在再生长叶松-无线草生态系统的模型中，土壤真菌比细根对升高的CO的反应更强烈。

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摘要

Rising atmospheric CO concentration will affect belowground processes and forest function. However, the direction and magnitude of change for many soil processes are unknown. We used minirhizotrons to observe fine root and fungal dynamics in response to elevated CO in a model regenerating longleaf pine community in open-top chambers. The model community consisted of five plant species common to xeric sandhills longleaf pine stands: Pinus palustris, Quercus margaretta, Aristida stricta, Crotalaria rotundifolia, and Asclepias tuberosa. Elevated CO significantly increased both fine root and mycorrhizal tip standing crop by more than 50% in the deeper soil horizon (17-34 cm). Rhizomorph standing crop was nearly doubled in both deep and shallow soil (P = 0.04). Survivorship results for fine roots and rhizomorphs varied between soil depths. Fine root survivorship was likely influenced more by changes in community composition and species interactions driven by elevated CO rather than by direct effects of elevated CO on the fine roots of individual species. In this system, it appears that elevated CO led to a greater reliance on fungal symbionts to meet additional nutrient requirements rather than substantially increased root growth.
机译：大气中CO浓度的升高会影响地下过程和森林功能。但是，许多土壤过程的变化方向和幅度尚不清楚。我们使用小型根生动物在一个开放顶室的再生长叶松树群落的模型中观察细根和真菌动态，以响应CO升高。模范群落由干性沙丘长叶松林中常见的五种植物组成：松属松，玛格丽特栎，严格阿里斯蒂达，猪屎豆属和块菌。在土壤深处（17-34厘米），CO的升高显着提高了细根和菌根尖端站立作物的产量均超过50％。在深层和浅层土壤中，根状茎站立的作物都几乎翻了一番（P = 0.04）。细根和根茎的存活结果随土壤深度而变化。优良根系的生存可能更多地受到CO升高驱动的群落组成和物种相互作用的变化的影响，而不是CO升高对单个物种的优良根系的直接影响。在该系统中，似乎升高的CO导致了对真菌共生物的更多依赖，以满足额外的营养需求，而不是大大增加了根的生长。

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