Fungal community responses to precipitation
Fungal community responses to precipitation
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DOI：
10.1111/j.1365-2486.2010.02327.x
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发表时间：
2011-04-01
影响因子：
11.6
通讯作者：
Suttle, Kenwyn Blake
中科院分区：
文献类型：
--
作者：
Hawkes, Christine V.;Kivlin, Stephanie N.;Suttle, Kenwyn Blake
了解真菌群落如何受降水影响，是预测土壤对未来气候变化的功能响应以及这些响应对土壤碳循环的影响的一个重要方面。我们在加利福尼亚北部对降雨进行长期野外调控，追踪了4年间的真菌丰度、真菌群落组成和土壤碳。真菌对降雨水平有直接反应，在干旱条件下，更丰富、多样且稳定的群落占主导，而在湿润时期和增雨处理中，出现的群落则不那么丰富、多样且更易变。土壤碳储量本身并不随降雨调整而变化，但分解速率的提高预示着在季节性降雨延长的条件下土壤碳的长期损失。在周期性干旱事件中真菌多样性和丰度的反复恢复表明，具有广泛环境耐受性的物种在这个群落中共存，这与土壤真菌的储存效应相符。干旱时期多样性的增加进一步表明干旱胁迫缓和了真菌类群之间的竞争。基于在此观察到的响应，我们认为土壤微生物群落经历自然环境波动的时间尺度与其对未来环境变化的响应能力之间可能存在一种关系。
Understanding how fungal communities are affected by precipitation is an essential aspect of predicting soil functional responses to future climate change and the consequences of those responses for the soil carbon cycle. We tracked fungal abundance, fungal community composition, and soil carbon across 4 years in long-term field manipulations of rainfall in northern California. Fungi responded directly to rainfall levels, with more abundant, diverse, and consistent communities predominating under drought conditions, and less abundant, less diverse, and more variable communities emerging during wetter periods and in rain-addition treatments. Soil carbon storage itself did not vary with rainfall amendments, but increased decomposition rates foreshadow longer-term losses of soil carbon under conditions of extended seasonal rainfall. The repeated recovery of fungal diversity and abundance during periodic drought events suggests that species with a wide range of environmental tolerances coexist in this community, consistent with a storage effect in soil fungi. Increased diversity during dry periods further suggests that drought stress moderates competition among fungal taxa. Based on the responses observed here, we suggest that there may be a relationship between the timescale at which soil microbial communities experience natural environmental fluctuations and their ability to respond to future environmental change.