DOI: 10.1016/j.scitotenv.2019.134691
论文题名: Responses of soil extracellular enzyme activities and microbial community properties to interaction between nitrogen addition and increased precipitation in a semi-arid grassland ecosystem
作者: Ma W. ; Li J. ; Gao Y. ; Xing F. ; Sun S. ; Zhang T. ; Zhu X. ; Chen C. ; Li Z.
刊名: Science of the Total Environment
ISSN: 489697
出版年: 2020
卷: 703 语种: 英语
英文关键词: Alleviated effects
; Extracellular enzyme activity
; Increased precipitation
; Nitrogen deposition
; Semi-arid grasslands
Scopus关键词: Biogeochemistry
; Enzyme activity
; Microorganisms
; Nitrogen
; Soils
; Alleviated effects
; Biogeochemical process
; Extracellular enzyme activity
; Extracellular enzymes
; Microbial communities
; Nitrogen deposition
; Semi-arid grasslands
; Soil microbial community
; Ecosystems
; hydrolase
; nitrogen
; phosphorus
; xylan 1,4 beta xylosidase
; enzyme activity
; grassland
; microbial community
; nitrogen cycle
; precipitation (climatology)
; semiarid region
; soil chemistry
; Article
; bacterial gene
; biogeochemistry
; chemical interaction
; controlled study
; environmental monitoring
; enzyme activity
; gene dosage
; grassland
; microbial community
; nitrogen deposition
; nonhuman
; nutrient cycling
; pH measurement
; precipitation
; prediction
; priority journal
; soil analysis
; stoichiometry
; China
; Bacteria (microorganisms)
英文摘要: Both atmospheric nitrogen (N) deposition and precipitation can strongly impact below-ground biogeochemical processes. Soil extracellular enzymes activities (EEAs) and microorganisms are considered as the key agents in ecosystem nutrient cycling. However, how the interaction between increasing N deposition and precipitation may affect soil EEAs and microbes remain poorly understood. In a 5-year field experiment in a meadow steppe in northern China, we tested the effects of N addition (N0, 0; N1, 5; N2, 10 g N m−2 yr−1) and increased precipitation (W0, ambient precipitation; W1, increase of 15% ambient precipitation; W2, increase of 30% ambient precipitation) on soil EEAs, microbial and chemical properties. Results showed that their interaction significantly affected all hydrolase activities, except for β-1,4-xylosidase (βX). Furthermore, increased precipitation and N addition interactively affected bacterial gene copies (P ≤ 0.05), and increased precipitation comparatively had a stronger effects. The results on the combination of N addition and increased precipitation showed that increased precipitation alleviated the positive effects of N addition on soil EEAs. This implies that the effects of either treatment alone on grassland biogeochemical processes may be alleviated by their simultaneous occurrence. Our results suggested that soil EEAs were mainly controlled by the content of N and phosphorus (P), and the ratio of C: N and C: P. Therefore, soil element content and stoichiometry could better explain the responses of EEAs to global changes. Moreover, soil microbial communities were mainly controlled by soil P content. Overall, our study highlights that the interaction between N deposition and precipitation may play a vital role in predicting the responses of soil enzyme activities to global changes in grassland ecosystems. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159321
Appears in Collections: 气候变化与战略
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作者单位: Institute of Grassland Science, Northeast Normal University, Key Laboratory of Vegetation Ecology, Ministry of Education, Changchun, 130024, China; Department of Biology, Lund University, Microbial Ecology, Ecology Building, Lund, 22646, Sweden; Institute of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
Recommended Citation:
Ma W.,Li J.,Gao Y.,et al. Responses of soil extracellular enzyme activities and microbial community properties to interaction between nitrogen addition and increased precipitation in a semi-arid grassland ecosystem[J]. Science of the Total Environment,2020-01-01,703