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Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils
Zhao, K (Zhao, Kang)1,2,3; Kong, WD (Kong, Weidong)1,2; Wang, F (Wang, Fei)1,2; Long, XE (Long, Xi-En)4; Guo, CY (Guo, Chunyan)1,2; Yue, LY (Yue, Linyan)1,2; Yao, HY (Yao, Huaiying)5; Dong, XB (Dong, Xiaobin)6
Source PublicationSOIL BIOLOGY & BIOCHEMISTRY
2018-12-01
Volume127Issue:0Pages:230-238
DOI10.1016/j.soilbio.2018.09.034
Abstract

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.

Subject Area生态学
WOS IDWOS:000449895600025
Language英语
Indexed BySCIE
KeywordSubunit Genes Cbbl Carbon-dioxide Community Structure Genome Sequence Grassland Soils Climate-change Diversity Bacteria Cyanobacteria Assimilation
WOS Research AreaAgriculture
WOS SubjectSoil Science
Cooperation Status国内
ISSN0038-0717
Department  高寒生态重点实验室
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8492
Collection图书馆
Corresponding AuthorKong, WD (Kong, Weidong)
Affiliation1.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.
Recommended Citation
GB/T 7714
Zhao, K ,Kong, WD ,Wang, F ,et al. Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils[J]. SOIL BIOLOGY & BIOCHEMISTRY,2018,127(0):230-238.
APA Zhao, K .,Kong, WD .,Wang, F .,Long, XE .,Guo, CY .,...&Dong, XB .(2018).Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils.SOIL BIOLOGY & BIOCHEMISTRY,127(0),230-238.
MLA Zhao, K ,et al."Desert and steppe soils exhibit lower autotrophic microbial abundance but higher atmospheric CO2 fixation capacity than meadow soils".SOIL BIOLOGY & BIOCHEMISTRY 127.0(2018):230-238.
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