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The temperature responses of soil respiration in deserts: a seven desert synthesis
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- Lucas, Richard (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
- (creator_code:org_t)
- 2010-06-23
- 2011
- English.
- In: Biogeochemistry. - : Springer Science and Business Media LLC. - 0168-2563 .- 1573-515X. ; 103, s. 71-90
- Journal article (peer-reviewed)
Abstract
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- The temperature response of soil respiration in deserts is not well quantified. We evaluated the response of respiration to temperatures spanning 67A degrees C from seven deserts across North America and Greenland. Deserts have similar respiration rates in dry soil at 20A degrees C, and as expected, respiration rates are greater under wet conditions, rivaling rates observed for more mesic systems. However, deserts differ in their respiration rates under wet soil at 20A degrees C and in the strength of the effect of current and antecedent soil moisture on the sensitivity and magnitude of respiration. Respiration increases with temperature below 30A degrees C but declines for temperatures exceeding 35A degrees C. Hot deserts have lower temperature sensitivity than cold deserts, and insensitive or negative temperature sensitivities were predicted under certain moisture conditions that differed among deserts. These results have implications for large-scale modeling efforts because we highlight the unique behavior of desert soil respiration relative to other systems. These behaviors include variable temperature responses and the importance of antecedent moisture conditions for soil respiration.
Subject headings
- LANTBRUKSVETENSKAPER -- Annan lantbruksvetenskap -- Miljö- och naturvårdsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Other Agricultural Sciences -- Environmental Sciences related to Agriculture and Land-use (hsv//eng)
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