干旱区生态环境知识资源中心(Arid): Analyzing High-Frequency Soil Respiration Using a Probabilistic Model in a Semiarid, Mediterranean Climate

Arid

DOI	10.1029/2018JG004640
	Analyzing High-Frequency Soil Respiration Using a Probabilistic Model in a Semiarid, Mediterranean Climate
	Anjileli, H.1; Moftakhari, H. R.1,2; Mazdiyasni, O.1; Norouzi, H.3; Ashraf, S.1; Farahmand, A.4; Bowler, P.5; Azarderakhsh, M.6; Huxman, Travis E.5; AghaKouchak, A.1,7
通讯作者	Anjileli, H.
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
EISSN	2169-8961
出版年	2019
卷号	124 期号:3 页码:509-520
英文摘要	High-frequency (subhourly) changes in soil respiration (Rs), a critical component of the carbon cycle, are not well documented in semiarid ecosystems. We investigate the response of Rs to subhourly soil temperature (Tsoil) and soil volumetric water content (VWC) variation in a semiarid ecosystem across a year of highly variable weather. We propose a probabilistic model to estimate the likelihood of Rs exceeding its annual mean (1.2molCO(2)/m(2)s), conditioned on different Tsoil and VWC values. The results show that Rs follows a Gaussian-like pattern as Tsoil increases, where it follows an upward trend until similar to 18 degrees C, and then begins to decline. Rs remains constant at Tsoil beyond similar to 27 degrees C. Using our novel conditional probability model, we show both the increasing and decreasing response of Rs to rising Tsoil through two ranges (14-17 and 20-23 degrees C) where Rs observations show opposing responses. We demonstrate that an increase in Tsoil from 14 to 17 degrees C causes a rise in Rs by a factor of 1.4 relative to the mean. The proposed model also describes how Rs reduces as Tsoil continues to increase above similar to 18 degrees C. Considering VWC and Tsoil into the proposed model, we show that when Tsoil is low (e.g., 17 degrees C), a rise in VWC yields a decrease of Rs by a factor of 3.6. However, when Tsoil is high (e.g., 23 degrees C), Rs increases with increasing VWC by a factor of 2.5. Overall, the probabilistic model enables us to detect and characterize changes in Rs distribution in response to different environmental variables and thresholds.
英文关键词	soil respiration CO2 flux semiarid region Mediterranean climate temperature sensitivity conditional probability density function
类型	Article
语种	英语
国家	USA
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000464653200005
WOS关键词	TEMPERATURE SENSITIVITY ; ECOSYSTEM ; MOISTURE ; DESERT ; FLUXES ; VEGETATION ; PULSES
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217082
作者单位	1.Univ Calif Irvine, Dept Civil & Environm Engn, Irvine, CA 92697 USA; 2.Univ Alabama, Civil Construct & Environm Engn, Tuscaloosa, AL USA; 3.City Univ NY, New York City Coll Technol, Dept Construct Management & Civil Engn, Brooklyn, NY USA; 4.CALTECH, NASA, Jet Prop Lab, Pasadena, CA 91125 USA; 5.Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92717 USA; 6.Fairleigh Dickinson Univ, Sch Engn & Comp Sci, Teaneck, NJ USA; 7.Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA USA
推荐引用方式 GB/T 7714	Anjileli, H.,Moftakhari, H. R.,Mazdiyasni, O.,et al. Analyzing High-Frequency Soil Respiration Using a Probabilistic Model in a Semiarid, Mediterranean Climate[J],2019,124(3):509-520.
APA	Anjileli, H..,Moftakhari, H. R..,Mazdiyasni, O..,Norouzi, H..,Ashraf, S..,...&AghaKouchak, A..(2019).Analyzing High-Frequency Soil Respiration Using a Probabilistic Model in a Semiarid, Mediterranean Climate.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,124(3),509-520.
MLA	Anjileli, H.,et al."Analyzing High-Frequency Soil Respiration Using a Probabilistic Model in a Semiarid, Mediterranean Climate".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 124.3(2019):509-520.