M.: The temperature responses of soil respiration in deserts: a seven desert synthesis

Abstract The temperature response of soil respiration in deserts is not well quantified. We evaluated the response of respiration to temperatures spanning 67°C from seven deserts across North America and Greenland. Deserts have similar respiration rates in dry soil at 20°C, and as expected, respirat...

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Main Authors: Jessica M Cable, Kiona Ogle, Richard W Lucas, Travis E Huxman, Michael E Loik, Stanley D Smith, David T Tissue, Brent E Ewers, Elise Pendall, Jeffrey M Welker, Therese N Charlet, Meagan Cleary, Alden Griffith, Robert S Nowak, Matthew Rogers, Heidi Steltzer, • Patrick, F Sullivan, Natasja C Van Gestel, K Ogle, Á B E Ewers, Á E Pendall, Á M Cleary, R W Lucas, T E Huxman, M E Loik, S D Smith, Á T N Charlet, D T Tissue, Á N C Van Gestel
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Greenland
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1047.6578
http://www.unm.edu/%7Eunmvclib/cascade/handouts/soilrespiration.pdf
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Summary:Abstract The temperature response of soil respiration in deserts is not well quantified. We evaluated the response of respiration to temperatures spanning 67°C from seven deserts across North America and Greenland. Deserts have similar respiration rates in dry soil at 20°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 20°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 30°C but declines for temperatures exceeding 35°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. Electronic supplementary material The online version of this article

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