A meta-analysis of soil microbial biomass responses to forest disturbances.
A meta-analysis of soil microbial biomass responses to forest disturbances.
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DOI：
10.3389/fmicb.2013.00163
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发表时间：
2013
影响因子：
5.2
通讯作者：
Treseder KK
中科院分区：
文献类型：
--
作者：
Holden SR;Treseder KK
气候变暖可能会增加森林扰动的频率和严重程度，对土壤微生物群落及其对生态系统C动态的贡献产生不确定的后果。为了解决这一不确定性，我们对139篇已发表的土壤微生物对森林干扰的反应进行了荟萃分析。这些干扰包括非生物（火灾、收获、风暴）和生物（昆虫、病原体）干扰。我们假设土壤微生物生物量在森林干扰后会下降，但非生物干扰会导致微生物生物量比生物干扰更大的减少。为了支持这一假设，在所有已发表的研究中，干扰使土壤微生物生物量平均减少了29.4%。然而，微生物对非生物和生物干扰的反应不同。在火灾、收获和风暴后，微生物生物量分别减少48.7%、19.1%和41.7%。相比之下，虫害和病原菌引起的树木死亡后土壤微生物生物量的变化不显著，尽管生物干扰在文献中很少有代表。当单独测量时，真菌和细菌对干扰的反应反映了整个微生物群落的反应。干扰后微生物丰度的变化与微生物呼吸的变化呈显著正相关。我们认为，非生物和生物干扰对微生物生物量的不同影响可能归因于不同干扰类型对土壤破坏和森林有机碳去除的差异。总之，这些结果表明，非生物森林干扰可能显著降低土壤微生物丰度，并对微生物呼吸产生相应的影响。生物干扰对森林土壤微生物群落和土壤碳动态的影响有待进一步研究。
Climate warming is likely to increase the frequency and severity of forest disturbances, with uncertain consequences for soil microbial communities and their contribution to ecosystem C dynamics. To address this uncertainty, we conducted a meta-analysis of 139 published soil microbial responses to forest disturbances. These disturbances included abiotic (fire, harvesting, storm) and biotic (insect, pathogen) disturbances. We hypothesized that soil microbial biomass would decline following forest disturbances, but that abiotic disturbances would elicit greater reductions in microbial biomass than biotic disturbances. In support of this hypothesis, across all published studies, disturbances reduced soil microbial biomass by an average of 29.4%. However, microbial responses differed between abiotic and biotic disturbances. Microbial responses were significantly negative following fires, harvest, and storms (48.7, 19.1, and 41.7% reductions in microbial biomass, respectively). In contrast, changes in soil microbial biomass following insect infestation and pathogen-induced tree mortality were non-significant, although biotic disturbances were poorly represented in the literature. When measured separately, fungal and bacterial responses to disturbances mirrored the response of the microbial community as a whole. Changes in microbial abundance following disturbance were significantly positively correlated with changes in microbial respiration. We propose that the differential effect of abiotic and biotic disturbances on microbial biomass may be attributable to differences in soil disruption and organic C removal from forests among disturbance types. Altogether, these results suggest that abiotic forest disturbances may significantly decrease soil microbial abundance, with corresponding consequences for microbial respiration. Further studies are needed on the effect of biotic disturbances on forest soil microbial communities and soil C dynamics.
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影响因子：
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