Arid
DOI10.1016/j.soilbio.2011.11.008
Optimum temperatures for soil respiration along a semi-arid elevation gradient in southern California
Richardson, Justin1,2; Chatterjee, Amitava2,3; Jenerette, G. Darrel1,2
通讯作者Richardson, Justin
来源期刊SOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
出版年2012
卷号46页码:89-95
英文摘要

Soil respiration (R) has not been adequately studied at temperatures above 35 degrees C, which are common temperatures for soils in the southwestern United States and may be important for C dynamics in semi-arid regions. While frequently excluded from ecosystem models or set to 35 degrees C, the optimum temperature for soil R is poorly understood. Optimum temperatures are likely controlled by substrate availability, soil moisture content, and previous climate. To quantify the optimal temperature for soil R and hypothesized relationships, we collected soils from beneath and between plant canopies at three sites along a semi-arid elevation gradient. Processed soil samples were incubated at three soil moisture contents and soil R was measured at 6 temperatures, successively (25-55 degrees C). From these data, an activation energy for reaction kinetics and deactivation energy for enzyme functionality model was used to generate soil R curves from which two parameters were derived: R-max, the maximum rate of soil R and T-opt, the optimum temperature for soil R. R-max was significantly greater for soils at the highest elevation and at medium soil moisture content. T-opt was greater than 35 degrees C at all locations. In addition, Tom was significantly greater for soils with greater amounts of SOM but not significantly different along the elevation gradient or at different moisture contents. These results support inclusion of much higher optimum temperatures than currently used in many ecosystem and land-surface models and provide support for explaining variation in T-opt as regulated by substrate quantity within a site and general insensitivity across climate differences. (C) 2011 Elsevier Ltd. All rights reserved.


英文关键词Soil CO2 efflux Santa Rosa Mountains Soil microenvironments Maximum soil respiration Modified Arrhenius equation Soil organic matter
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000300743400012
WOS关键词ORGANIC-MATTER DECOMPOSITION ; TERRESTRIAL ECOSYSTEMS ; LITTER QUALITY ; DEPENDENCE ; MOISTURE ; WATER ; SENSITIVITY ; PARAMETERS ; VEGETATION ; MICROCOSMS
WOS类目Soil Science
WOS研究方向Agriculture
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/175049
作者单位1.Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA;
2.Univ Calif Riverside, Ctr Conservat Biol, Riverside, CA 92521 USA;
3.N Dakota State Univ, Dept Soil Sci, Fargo, ND 58108 USA
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Richardson, Justin,Chatterjee, Amitava,Jenerette, G. Darrel. Optimum temperatures for soil respiration along a semi-arid elevation gradient in southern California[J],2012,46:89-95.
APA Richardson, Justin,Chatterjee, Amitava,&Jenerette, G. Darrel.(2012).Optimum temperatures for soil respiration along a semi-arid elevation gradient in southern California.SOIL BIOLOGY & BIOCHEMISTRY,46,89-95.
MLA Richardson, Justin,et al."Optimum temperatures for soil respiration along a semi-arid elevation gradient in southern California".SOIL BIOLOGY & BIOCHEMISTRY 46(2012):89-95.
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