DOI: 10.1016/S1002-0160(19)60832-5
论文题名: Responses of soil microbial communities and functions associated with organic carbon mineralization to nitrogen addition in a Tibetan grassland
作者: LUO R. ; LUO J. ; FAN J. ; LIU D. ; HE J.-S. ; PERVEEN N. ; DING W.
刊名: Pedosphere
ISSN: 10020160
出版年: 2020
卷: 30, 期: 2 语种: 英语
英文关键词: alpine grassland
; C cycling
; C turnover
; community level physiological profiles (CLPP)
; enzyme activity
; microbial community composition
; microbial function
; N input
Scopus关键词: biomass
; biomineralization
; calcareous grassland
; community composition
; community response
; community structure
; enzyme
; enzyme activity
; fungus
; global change
; grassland
; growth
; microbial activity
; organic carbon
; relative abundance
; soil carbon
; soil microorganism
; soil nitrogen
; Qinghai-Xizang Plateau
; Bacteria (microorganisms)
; Fungi
; Negibacteria
; Posibacteria
英文摘要: Alpine grasslands with a high soil organic carbon (SOC) storage on the Tibetan Plateau are experiencing rapid climate warming and anthropogenic nitrogen (N) deposition; this is expected to substantially increase the soil N availability, which may impact carbon (C) cycling. However, little is known regarding how N enrichment influences soil microbial communities and functions relative to C cycling in this region. We conducted a 4-year field experiment on an alpine grassland to evaluate the effects of four different rates of N addition (0, 25, 50, and 100 kg N ha−1 year−1) on the abundance and community structure (phospholipid fatty acids, PLFAs) of microbes, enzyme activities, and community level physiological profiles (CLPP) in soil. We found that N addition increased the microbial biomass C (MBC) and N (MBN), along with an increased abundance of bacterial PLFAs, especially Gram-negative bacterial PLFAs, with a decreasing ratio of Gram-positive to Gram-negative bacteria. The N addition also stimulated the growth of fungi, especially arbuscular mycorrhizal fungi, reducing the ratio of fungi to bacteria. Microbial functional diversity and activity of enzymes involved in C cycling (β-1,4-glucosidase and phenol oxidase) and N cycling (β-1,4-N-acetyl-glucosaminidase and leucine aminopeptidase) increased after N addition, resulting in a loss of SOC. A meta-analysis showed that the soil C/N ratio was a key factor in the response of oxidase activity to N amendment, suggesting that the responses of soil microbial functions, which are linked to C turnover relative to N input, primarily depended upon the soil C/N ratio. Overall, our findings highlight that N addition has a positive influence on microbial communities and their associated functions, which may reduce soil C storage in alpine grasslands under global change scenarios. © 2020 Soil Science Society of China Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158465
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, 10049, China; AgResearch Limited, Ruakura Research Centre, Hamilton, 3240, New Zealand; Department of Ecology, College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing, 100871, China
Recommended Citation:
LUO R.,LUO J.,FAN J.,et al. Responses of soil microbial communities and functions associated with organic carbon mineralization to nitrogen addition in a Tibetan grassland[J]. Pedosphere,2020-01-01,30(2)