Rapid recovery of soil bacterial communities after wildfire in a Chinese boreal forest.
Rapid recovery of soil bacterial communities after wildfire in a Chinese boreal forest.
复制标题
中国北方森林火灾后土壤细菌群落的快速恢复
DOI：
10.1038/srep03829
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发表时间：
2014-01-23
影响因子：
4.6
通讯作者：
Chu H
中科院分区：
文献类型：
--
作者：
Xiang X;Shi Y;Yang J;Kong J;Lin X;Zhang H;Zeng J;Chu H
火灾每年影响数亿公顷土地。火灾后地上群落的组成和多样性已被广泛研究，但尽管细菌在生态系统恢复和功能中发挥着核心作用，但火灾对土壤细菌群落的影响在很大程度上仍未得到检验。我们利用标记焦磷酸测序技术研究了中国大兴安岭森林火灾细菌群落的反应。火灾极大地改变了土壤细菌群落组成，高强度火灾显着降低了燃烧地点一年后的细菌多样性。 11 年后，细菌群落组成和多样性恢复到与对照（无火）中观察到的相似水平。在北方森林中，林下植被群落通常需要 20-100 年才能达到火灾前的状态，因此我们的结果表明，土壤细菌的恢复速度比植物群落快得多。最后，在受野火干扰的土壤中，土壤细菌群落组成与土壤 pH 值、水分含量、NH4+ 含量和碳/氮比显着共变（所有情况下 P < 0.05），表明火灾可能通过改变土壤土壤特性来间接影响细菌群落。
Fires affect hundreds of millions of hectares annually. Above-ground community composition and diversity after fire have been studied extensively, but effects of fire on soil bacterial communities remain largely unexamined despite the central role of bacteria in ecosystem recovery and functioning. We investigated responses of bacterial community to forest fire in the Greater Khingan Mountains, China, using tagged pyrosequencing. Fire altered soil bacterial community composition substantially and high-intensity fire significantly decreased bacterial diversity 1-year-after-burn site. Bacterial community composition and diversity returned to similar levels as observed in controls (no fire) after 11 years. The understory vegetation community typically takes 20–100 years to reach pre-fire states in boreal forest, so our results suggest that soil bacteria could recover much faster than plant communities. Finally, soil bacterial community composition significantly co-varied with soil pH, moisture content, NH4+content and carbon/nitrogen ratio (P < 0.05 in all cases) in wildfire-perturbed soils, suggesting that fire could indirectly affect bacterial communities by altering soil edaphic properties.
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