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Critical transition of soil bacterial diversity and composition triggered by nitrogen enrichment
Liu, Weixing; Jiang, Lin1; Yang, Sen2; Wang, Zhou2,3; Tian, Rui4; Peng, Ziyang1; Chen, Yongliang; Zhang, Xingxu5; Kuang, Jialiang6,7; Ling, Ning8; Wang, Shaopeng9; Liu, Lingli2
Source PublicationECOLOGY
AbstractSoil bacterial communities are pivotal in regulating terrestrial biogeochemical cycles and ecosystem functions. The increase in global nitrogen (N) deposition has impacted various aspects of terrestrial ecosystems, but we still have a rudimentary understanding of whether there is a threshold for N input level beyond which soil bacterial communities will experience critical transitions. Using high-throughput sequencing of the 16S rRNA gene, we examined soil bacterial responses to a long-term (13 yr), multi-level, N addition experiment in a temperate steppe of northern China. We found that plant diversity decreased in a linear fashion with increasing N addition. However, bacterial diversity responded nonlinearly to N addition, such that it was unaffected by N input below 16 g N center dot m(-2)center dot yr(-1), but decreased substantially when N input exceeded 32 g N center dot m(-2)center dot yr(-1). A meta-analysis across four N addition experiments in the same study region further confirmed this nonlinear response of bacterial diversity to N inputs. Substantial changes in soil bacterial community structure also occurred between N input levels of 16 to 32 g N center dot m(-2)center dot yr(-1). Further analysis revealed that the loss of soil bacterial diversity was primarily attributed to the reduction in soil pH, whereas changes in soil bacterial community were driven by the combination of increased N availability, reduced soil pH, and changes in plant community structure. In addition, we found that N addition shifted bacterial communities toward more putatively copiotrophic taxa. Overall, our study identified a threshold of N input level for bacterial diversity and community composition. The nonlinear response of bacterial diversity to N input observed in our study indicates that although bacterial communities are resistant to low levels of N input, further increase in N input could trigger a critical transition, shifting bacterial communities to a low-diversity state.
Keywordacidification bacterial community composition bacterial diversity life history plant diversity threshold
Subject AreaEcology
Indexed BySCI
WOS Research AreaEnvironmental Sciences & Ecology
WOS IDWOS:000548386700001
Publication PlaceHOBOKEN
Funding OrganizationNational Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31770530, 31370488, 31988102] ; Chinese National Key Development Program for Basic Research [2017YFC0503900] ; National Science Foundation of USANational Science Foundation (NSF) [DEB-1856318, CBET-1833988] ; CAS Interdisciplinary Innovation Team [JCTD-2018-06] ; State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou University
Corresponding Author EmailLingli.liu@ibcas.ac.cn
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Cited Times:32[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
2.Georgia Inst Technol, Sch Biol Sci, Atlanta, GA 30332 USA
3.Univ Chinese Acad Sci, Yuquan Rd, Beijing 100049, Peoples R China
4.Chinese Acad Sci, South China Bot Garden, Prov Key Lab Appl Bot, Key Lab Vegetat Restorat & Management Degraded Ec, Guangzhou 510650, Peoples R China
5.Henan Univ, Coll Life Sci, Int Joint Res Lab Global Change Ecol, Kaifeng 475004, Henan, Peoples R China
6.Lanzhou Univ, State Key Lab Grassland Agroecosyst SKLGAE, Lanzhou, Peoples R China
7.Univ Oklahoma, Inst Environm Genom, Norman, OK 73109 USA
8.Univ Oklahoma, Dept Microbiol & Plant Biol, Norman, OK 73109 USA
9.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China
10.Peking Univ, Inst Ecol, Coll Urban & Environm Sci, Beijing 100871, Peoples R China
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GB/T 7714
Liu, Weixing,Jiang, Lin,Yang, Sen,et al. Critical transition of soil bacterial diversity and composition triggered by nitrogen enrichment[J]. ECOLOGY,2020,101(8).
APA Liu, Weixing.,Jiang, Lin.,Yang, Sen.,Wang, Zhou.,Tian, Rui.,...&Liu, Lingli.(2020).Critical transition of soil bacterial diversity and composition triggered by nitrogen enrichment.ECOLOGY,101(8).
MLA Liu, Weixing,et al."Critical transition of soil bacterial diversity and composition triggered by nitrogen enrichment".ECOLOGY 101.8(2020).
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