Aggregation and Soil Organic Matter Accumulation in Cultivated and Native Grassland Soils英文资料.pdf

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Aggregation and Soil Organic Matter Accumulation in Cultivated and Native Grassland Soils J. Six,* E.T. Elliott, K. Paustian, and J. W. Doran ABSTRACT Defining SOM pools that relate to soil structure and Tillage intensity affects soil structure and the loss of soil organic delineating SOM fractions that are functionally mean-

C and N. We hypothesized that no-tillage (NT) and conventional ingful are important challenges for research and are

tillage (CT) differentially affect three physically defined particulate necessary for a better understanding of SOM dynamics.

organic matter (POM) fractions. A grassland-derived Haplustoll was For example, Elliott et al. (1996) and Christensen (1996)

separated into aggregates by wet sieving. Free light fraction (LF) and described the importance of differ

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