DOI: 10.1007/s10533-013-9849-x
Scopus记录号: 2-s2.0-84891902186
论文题名: Ecoenzymatic stoichiometry of microbial nutrient acquisition in tropical soils
作者: Waring B.G. ; Weintraub S.R. ; Sinsabaugh R.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 117, 期: 1 起始页码: 101
结束页码: 113
语种: 英语
英文关键词: Carbon use efficiency
; Ecological stoichiometry
; Nutrient limitation
; Resource allocation model
; Soil enzymes
; Tropical forest
Scopus关键词: biogeochemistry
; biomass
; enzyme activity
; grassland
; growth rate
; microbial activity
; microbial community
; nutrient availability
; nutrient limitation
; organic carbon
; organic nitrogen
; phosphorus
; resource allocation
; stoichiometry
; tropical environment
英文摘要: The relative activities of soil enzymes involved in mineralizing organic carbon (C), nitrogen (N), and phosphorus (P) reveal stoichiometric and energetic constraints on microbial biomass growth. Although tropical forests and grasslands are a major component of the global C cycle, the effects of soil nutrient availability on microbial activity and C dynamics in these ecosystems are poorly understood. To explore potential microbial nutrient limitation in relation to enzyme allocation in low latitude ecosystems, we performed a meta-analysis of acid/alkaline phosphatase (AP), β-1,4-glucosidase (BG), and β-1,4-N-acetyl-glucosaminidase (NAG) activities in tropical soils. We found that BG:AP and NAG:AP ratios in tropical soils are significantly lower than those of temperate ecosystems overall. The lowest BG:AP and NAG:AP ratios were associated with old or acid soils, consistent with greater biological phosphorus demand relative to P availability. Additionally, correlations between enzyme activities and mean annual temperature and precipitation suggest some climatic regulation of microbial enzyme allocation in tropical soils. We used the results of our analysis in conjunction with previously published data on soil and biomass C:N:P stoichiometry to parameterize a biogeochemical equilibrium model that relates microbial growth efficiency to extracellular enzyme activity. The model predicts low microbial growth efficiencies in P-limited soils, indicating that P availability may influence C cycling in the highly weathered soils that underlie many tropical ecosystems. Therefore, we suggest that P availability be included in models that simulate microbial enzyme allocation, biomass growth, and C mineralization. © 2013 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83715
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Section of Integrative Biology, University of Texas at Austin, Austin, TX, United States; INSTAAR and Department of Ecology and Evolutionary Biology, University of Colorado at Boulder, Boulder, CO, United States; Biology Department, University of New Mexico, Albuquerque, NM, United States
Recommended Citation:
Waring B.G.,Weintraub S.R.,Sinsabaugh R.L.. Ecoenzymatic stoichiometry of microbial nutrient acquisition in tropical soils[J]. Biogeochemistry,2014-01-01,117(1)