Carbon, Nitrogen, and Sulfur Pools in Particle‐Size Fractions as Influenced by Climate

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Abstract
The response of soil organic matter (SOM) dynamics to climate change may be deduced from changes in the distribution of SOM among different C pools. The distribution of soil organic carbon (SOC), total N, and total S in particle‐size fractions were measured to assess the influences of climate. Clay (R2 = 0.80*** [significant at P = 0.001] for SOC and 0.83*** for N); the concentration of SOM in the fine sand fraction showed the opposite trends. Principal axis component analyses confirmed that both clay and fine sand fractions comprised sensitive SOC and N pools related to climate, whereas S seemed to be controlled by factors other than those regulating the dynamics of SOC and N. These results suggest that SOM is preferably decayed from pools of the fine sand fractions with increasing temperature, resulting in a relative enrichment of SOM stabilized on clay.

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