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Title of Journal: Biogeochemistry

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Abbravation: Biogeochemistry

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Springer Netherlands

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DOI

10.1016/0022-2836(76)90097-8

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1573-515X

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Relations of mineralsoil C and N to climate and t

Authors: Peter S Homann Jason S Kapchinske Andrew Boyce
Publish Date: 2007/07/12
Volume: 85, Issue: 3, Pages: 303-316
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Abstract

Soil is a prominent component of terrestrial C and N budgets Soil C and N pools are influenced by and may reciprocally influence many environmental factors Our objective was to determine the quantitative relations of surface mineralsoil organic C N and C/N ratios to climate and soil texture across seven ecological regions that make up the conterminous USA Up to 608 soil profiles per region and their corresponding climates were evaluated with regression analysis The organic C pool kg C m−2 in the upper 20 cm of mineral soil was positively related to mean annual precipitation evapotranspiration and clay content in all regions It was negatively related to a temperature/precipitation index in all regions and negatively related to mean annual temperature except in the northwest temperate forest region Soil C/N ratios were negatively related to clay or silt content in all regions These relations are consistent with concepts of moisture and temperature controls on detrital production differential effects of temperature on detrital production and decomposition and stabilization of organic matter by clay and silt Differences in quantitative relations among regions may be related to vegetationcomposition effects on soil organic matter processes clay mineralogy and faunal mixing of surface organic horizons with mineral soil Regional differences also occurred in the importance of climate vs soil texture in explaining the variability in soil C The regional differences indicate the importance of using regionspecific rather than generalized equations for projecting longterm soil responses to climate change and for conducting ecosystemmodel calibration or validationWe thank John Kimble for his continued efforts to make funds and soil data available for environmental research We thank Chris Daly and the Oregon Climate Service for access to PRISM climate layers Major funding was provided by the Natural Resources Conservation Service under NRCS agreement number 6874827310 Additional funding was provided by the Office of Research and Sponsored Programs Western Washington University We thank three anonymous reviewers for helpful comments on an earlier version of this manuscript

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