气候变化领域集成服务门户(CCPortal): Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils

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DOI	10.1016/j.soilbio.2018.09.034
	Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils
	Zhao, Kang; Kong, Weidong; Wang, Fei; Long, Xi-En; Guo, Chunyan; Yue, Linyan; Yao, Huaiying; Dong, Xiaobin
通讯作者	Kong, WD (通讯作者)
发表日期	2018
ISSN	0038-0717
EISSN	1879-3428
起始页码	230
结束页码	238
卷号	127
英文摘要	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 CO2 fixation capacity was assessed by the (CO2)-C-13 probing 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 atmospheric (CO2)-C-13 fixation rate than meadow soils (29 versus 18 mg kg(-1) soil d(-1)). The (CO2)-C-13 fixation 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 with Cyanobacteria. Form IC autotrophs were affiliated with Rhizobiales and Actinobacteria, 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.
关键词	SUBUNIT GENES CBBL CARBON-DIOXIDE COMMUNITY STRUCTURE GENOME SEQUENCE GRASSLAND SOILS CLIMATE-CHANGE DIVERSITY BACTERIA CYANOBACTERIA ASSIMILATION
英文关键词	Soil autotrophs; CO2 fixation; Tibetan plateau; Grassland; cbbL gene; Stable isotope
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000449895600025
来源期刊	SOIL BIOLOGY & BIOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259293
推荐引用方式 GB/T 7714	Zhao, Kang,Kong, Weidong,Wang, Fei,et al. Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils[J]. 中国科学院青藏高原研究所,2018,127.
APA	Zhao, Kang.,Kong, Weidong.,Wang, Fei.,Long, Xi-En.,Guo, Chunyan.,...&Dong, Xiaobin.(2018).Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils.SOIL BIOLOGY & BIOCHEMISTRY,127.
MLA	Zhao, Kang,et al."Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils".SOIL BIOLOGY & BIOCHEMISTRY 127(2018).