Arid
DOI10.1016/j.soilbio.2018.09.034
Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils
Zhao, Kang1,2,3; Kong, Weidong1,2; Wang, Fei1,2; Long, Xi-En4; Guo, Chunyan1,2; Yue, Linyan1,2; Yao, Huaiying4,5; Dong, Xiaobin6
通讯作者Kong, Weidong
来源期刊SOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
出版年2018
卷号127页码:230-238
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.


英文关键词Soil autotrophs CO2 fixation Tibetan plateau Grassland cbbL gene Stable isotope
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000449895600025
WOS关键词SUBUNIT GENES CBBL ; CARBON-DIOXIDE ; COMMUNITY STRUCTURE ; GENOME SEQUENCE ; GRASSLAND SOILS ; CLIMATE-CHANGE ; DIVERSITY ; BACTERIA ; CYANOBACTERIA ; ASSIMILATION
WOS类目Soil Science
WOS研究方向Agriculture
来源机构北京师范大学 ; 中国科学院青藏高原研究所
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/213212
作者单位1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100101, Peoples R China;
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100039, Peoples R China;
3.Chinese Acad Sci, Inst Genet & Dev Biol, Ctr Agr Resources Res, Shijiazhuang 050021, Hebei, Peoples R China;
4.Chinese Acad Sci, Key Lab Urban Environm & Hlth, Inst Urban Environm, Xiamen, Peoples R China;
5.Wuhan Inst Technol, Sch Environm Ecol & Biol Engn, Res Ctr Environm Ecol & Engn, Wuhan 430073, Hubei, Peoples R China;
6.Beijing Normal Univ, Coll Resources Sci & Technol, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
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]. 北京师范大学, 中国科学院青藏高原研究所,2018,127:230-238.
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,127,230-238.
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):230-238.
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