干旱区生态环境知识资源中心(Arid): Salinity Is a Key Determinant for Soil Microbial Communities in a Desert Ecosystem

Arid

DOI	10.1128/mSystems.00225-18
	Salinity Is a Key Determinant for Soil Microbial Communities in a Desert Ecosystem
	Zhang, Kaoping 1,5; Shi, Yu 1; Cui, Xiaoqing 2; Yue, Ping 3; Li, Kaihui 3; Liu, Xuejun 2; Tripathi, Binu M.4; Chu, Haiyan 1
通讯作者	Chu, Haiyan
来源期刊	MSYSTEMS
ISSN	2379-5077
出版年	2019
卷号	4 期号:1
英文摘要	Soil salinization is a growing environmental problem caused by both natural and human activities. Excessive salinity in soil suppresses growth, decreases species diversity, and alters the community composition of plants; however, the effect of salinity on soil microbial communities is poorly understood. Here, we characterize the soil microbial community along a natural salinity gradient in Gurbantunggut Desert, Northwestern China. Microbial diversity linearly decreased with increases in salinity, and community dissimilarity significantly increased with salinity differences. Soil salinity showed a strong effect on microbial community dissimilarity, even after controlling for the effects of spatial distance and other environmental variables. Microbial phylotypes (n = 270) belonging to Halobacteria, Nitriliruptoria, [Rhodothermi], Gammaproteobacteria, and Alphaproteobacteria showed a high-salinity niche preference. Out of nine potential phenotypes predicted by BugBase, oxygen-related phenotypes showed a significant relationship with salinity content. To explore the community assembly processes, we used null models of within-community (nearest-taxon index [NTI]) and between-community (beta NTI) phylogenetic composition. NTI showed a significantly negative relationship with salinity, suggesting that the microbial community was less phylogenetically clustered in more-saline soils. beta NTI, the between-community analogue of NTI, showed that deterministic processes have overtaken stochastic processes across all sites, suggesting the importance of environmental filtering in microbial community assembly. Taken together, these results suggest the importance of salinity in soil microbial community composition and assembly processes in a desert ecosystem. IMPORTANCE Belowground microorganisms are indispensable components for nutrient cycling in desert ecosystems, and understanding how they respond to increased salinity is essential for managing and ameliorating salinization. Our sequence-based data revealed that microbial diversity decreased with increasing salinity, and certain salt-tolerant phylotypes and phenotypes showed a positive relationship with salinity. Using a null modeling approach to estimate microbial community assembly processes along a salinity gradient, we found that salinity imposed a strong selection pressure on the microbial community, which resulted in a dominance of deterministic processes. Studying microbial diversity and community assembly processes along salinity gradients is essential in understanding the fundamental ecological processes in desert ecosystems affected by salinization.
英文关键词	community assembly processes community diversity desert ecosystem microbial phenotypes salinity
类型	Article
语种	英语
国家	Peoples R China ; South Korea
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000460343800016
WOS关键词	PHYLOGENETIC DIVERSITY ; BACTERIAL COMMUNITIES ; GLOBAL PATTERNS ; GRADIENT ; DYNAMICS ; MOISTURE
WOS类目	Microbiology
WOS研究方向	Microbiology
来源机构	中国科学院新疆生态与地理研究所 ; 中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217697
作者单位	1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing, Jiangsu, Peoples R China; 2.China Agr Univ, Key Lab Plant Soil Interact, Coll Resources & Environm Sci, Minist Educ, Beijing, Peoples R China; 3.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Key Lab Biogeog & Bioresource Arid Land, Urumqi, Peoples R China; 4.Korea Polar Res Inst, Incheon, South Korea; 5.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Kaoping,Shi, Yu,Cui, Xiaoqing,et al. Salinity Is a Key Determinant for Soil Microbial Communities in a Desert Ecosystem[J]. 中国科学院新疆生态与地理研究所, 中国农业大学,2019,4(1).
APA	Zhang, Kaoping.,Shi, Yu.,Cui, Xiaoqing.,Yue, Ping.,Li, Kaihui.,...&Chu, Haiyan.(2019).Salinity Is a Key Determinant for Soil Microbial Communities in a Desert Ecosystem.MSYSTEMS,4(1).
MLA	Zhang, Kaoping,et al."Salinity Is a Key Determinant for Soil Microbial Communities in a Desert Ecosystem".MSYSTEMS 4.1(2019).