DOI: 10.1007/s10533-016-0270-0
Scopus记录号: 2-s2.0-84995459704
论文题名: Pore-scale investigation on the response of heterotrophic respiration to moisture conditions in heterogeneous soils
作者: Yan Z. ; Liu C. ; Todd-Brown K.E. ; Liu Y. ; Bond-Lamberty B. ; Bailey V.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 131, 期: 2018-01-02 起始页码: 121
结束页码: 134
语种: 英语
英文关键词: Clay content
; Heterotrophic respiration
; Moisture
; Pore-scale
; Process model
; Soil structure
Scopus关键词: bioavailability
; carbon emission
; clay
; climate change
; heterotrophy
; laboratory method
; microbial activity
; moisture content
; numerical model
; pore space
; soil carbon
; soil moisture
; soil respiration
; soil structure
; water content
英文摘要: The relationship between microbial respiration rate and soil moisture content is an important property for understanding and predicting soil organic carbon degradation, CO2 production and emission, and their subsequent effects on climate change. This paper reports a pore-scale modeling study to investigate the response of heterotrophic respiration to moisture conditions in soils and to evaluate various factors that affect this response. X-ray computed tomography was used to derive soil pore structures, which were then used for pore-scale model investigation. The pore-scale results were then averaged to calculate the effective respiration rates as a function of water content in soils. The calculated effective respiration rate first increases and then decreases with increasing soil water content, showing a maximum respiration rate at water saturation degree of 0.75, which is consistent with field and laboratory observations. The relationship between the respiration rate and moisture content is affected by various factors, including pore-scale organic carbon bioavailability, the rate of oxygen delivery, soil pore structure and physical heterogeneity, soil clay content, and microbial drought resistivity. Overall, this study provides mechanistic insights into the soil respiration response to the change in moisture conditions, and reveals a complex relationship between heterotrophic microbial respiration rate and moisture content in soils that is affected by various hydrological, geophysical, and biochemical factors. © 2016, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83334
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: Pacific Northwest National Laboratory, 3335 Innovation Blvd, Richland, WA, United States; School of Environmental Science and Engineering, South University of Science and Technology of China, Shenzhen, China; Pacific Northwest National Laboratory-University of Maryland Joint Global Climate Change Research Institute, College Park, MD, United States
Recommended Citation:
Yan Z.,Liu C.,Todd-Brown K.E.,et al. Pore-scale investigation on the response of heterotrophic respiration to moisture conditions in heterogeneous soils[J]. Biogeochemistry,2016-01-01,131(2018-01-02)