The effect of fire on microbial biomass: a meta-analysis of field studies
The effect of fire on microbial biomass: a meta-analysis of field studies
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DOI：
10.1007/s10533-011-9633-8
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发表时间：
2012-07-01
期刊：
影响因子：
4
通讯作者：
Treseder, Kathleen K.
中科院分区：
文献类型：
--
作者：
Dooley, Sandra R.;Treseder, Kathleen K.
土壤微生物调节碳(C)从生态系统向大气的转移，从而影响陆地生态系统之间的反馈和全球气候变化。火是全球变化的一个因素，可能会影响土壤微生物群落，进而影响它们对生态系统碳动态的贡献。为了提高我们对火灾如何影响地下群落的理解，我们对42种已发表的微生物对火的反应进行了荟萃分析。我们假设，在火灾发生后，微生物生物量作为一个整体，特别是真菌生物量会发生变化。在所有研究中，火平均降低了33.2%的微生物丰度和47.6%的真菌丰度。然而，微生物对火的反应在不同的生物群和火类型之间存在显著差异。例如，在北方和温带森林发生火灾后，微生物生物量下降，但在草原火灾后没有下降。此外，与规定的焚烧相比，野火导致微生物生物量的减少更大。这些差异很可能是由于不同生物群和火灾类型的火灾严重程度不同所致。微生物丰度的变化与土壤二氧化碳排放的变化显著相关。总之，这些结果表明，火灾可能会显著降低微生物的丰度，从而对土壤二氧化碳排放产生相应的后果。
Soil microbes regulate the transfer of carbon (C) from ecosystems to the atmosphere and in doing so influence feedbacks between terrestrial ecosystems and global climate change. Fire is one element of global change that may influence soil microbial communities and, in turn, their contribution to the C dynamics of ecosystems. In order to improve our understanding of how fire influences belowground communities, we conducted a meta-analysis of 42 published microbial responses to fire. We hypothesized that microbial biomass as a whole, and fungal biomass specifically, would be altered following fires. Across all studies, fire reduced microbial abundance by an average of 33.2% and fungal abundance by an average of 47.6%. However, microbial responses to fire differed significantly among biomes and fire types. For example, microbial biomass declined following fires in boreal and temperate forests but not following grasslands fires. In addition, wildfires lead to a greater reduction in microbial biomass than prescribed burns. These differences are likely attributable to differences in fire severity among biomes and fire types. Changes in microbial abundance were significantly correlated with changes in soil CO2 emissions. Altogether, these results suggest that fires may significantly decrease microbial abundance, with corresponding consequences for soil CO2 emissions.