Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils
Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils
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沙漠和草原土壤比草甸土壤表现出较低的自养微生物丰度，但具有较高的大气二氧化碳固定能力
DOI：
10.1016/j.soilbio.2018.09.034
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发表时间：
2018-12
影响因子：
9.7
通讯作者：
Xiaobin Dong
中科院分区：
文献类型：
--
作者：
Kang Zhao;Weidong Kong;Fei Wang;Xi-En Long;Chunyan Guo;Linyan Yue;Huaiying Yao;Xiaobin Dong
在半干旱和干旱生态系统（如青藏高原草原）中，土壤自养微生物的二氧化碳固定作用与植物的固定作用一样重要。二氧化碳固定微生物群落特征、能力及其驱动环境因素仍不清楚。在这里，我们利用针对核酮糖-1, 5-二磷酸羧化酶/加氧酶大亚基基因（cbbL）的分子方法研究了青藏高原草地表层土壤中的自养微生物群落。通过 13 CO 2 探测方法评估CO 2 固定能力。结果表明，从荒漠、草原到草甸，土壤自养微生物丰度大幅增加。随着年平均降水量（MAP）、土壤铵浓度和地上植物生物量（APB）的增加，自养丰度显着增加。 IAB 和 IC 自养微生物群落的形式随草地类型的不同而有很大差异。变异划分分析表明，MAP和干旱度主要解释了结构变异，其中IAB群落的结构变异解释为4.2%和2.6%，IC群落的结构变异解释为7.6%和8.5%。沙漠和草原土壤表现出比草甸土壤显着更高的大气 13CO2 固定率（29 vs 18mg kg−1soil d−1）。 13CO2固定率与APB和土壤铵浓度呈负相关，证明了自养微生物在贫营养土壤中的重要作用。 IAB 型自养生物在系统发育上属于蓝细菌。 IC型自养生物隶属于根瘤菌和放线菌，从荒漠、草原到草甸，前者逐渐增多，后者逐渐减少。我们的研究结果为 MAP 在驱动土壤自养微生物群落中的重要性提供了新的见解，并强调了微生物在旱地生态系统碳循环中的作用。
CO2-fixing by soil autotrophic microbes is as important as by plants in semi-arid and arid ecosystems, such as the Tibetan Plateau grassland. CO2-fixing microbial community characteristics, capacity and their driving environmental factors remain unclear. Here we investigated the autotrophic microbial community in grassland surface soils on the Tibetan Plateau using molecular methods targeting the large subunit gene (cbbL) of ribulose-1, 5-bisphosphate carboxylase/oxygenase. The CO2fixation capacity was assessed by the13CO2probing method. The results showed that soil autotrophic microbial abundance substantially increased from desert, steppe to meadow. The autotrophic abundance significantly increased with enhancing mean annual precipitation (MAP), soil ammonium concentration and aboveground plant biomass (APB). Forms IAB and IC autotrophic microbial communities strongly varied with grassland types. Variation partitioning analysis revealed that the structure variations were mainly explained by MAP and aridity, which explained 4.2% and 2.6% for the IAB community, and 7.6% and 8.5% for the IC community. Desert and steppe soils exhibited significantly higher atmospheric13CO2fixation rate than meadow soils (29 versus 18 mg kg−1soil d−1). The13CO2fixation rate negatively correlated with APB and soil ammonium concentration, demonstrating the substantially important role of autotrophic microbes in oligotrophic soils. Form IAB autotrophs were phylogenetically affiliated withCyanobacteria. Form IC autotrophs were affiliated withRhizobialesandActinobacteria, the former gradually increased and the latter decreased from desert, steppe to meadow. Our findings offer new insight into the importance of MAP in driving soil autotrophic microbial community and highlight microbial roles in carbon cycling in dryland ecosystems.
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DOI：
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发表时间：
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期刊：
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