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Impact of land use and soil fertility on distributions of soil aggregate fractions and some nutrients.

作者：

Liu XiaoLi;He YuanQiu;Zhang, H. L.;Schroder, J. K.;Li ChengLiang;Zhou Jing;Zhang ZhiYong

单位：

Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China

关键词：

aggregates;chemical composition;formation;grassland soils;grasslands;land use;nutrients;orchard soils;orchards;paddy soils;red soils;rice;soil;soil fertility;soil science;soil structure;soil types (anthropogenic);soiltypes (cultural);soil types (ecological);soil types (genetic);soil types (physiographic);structure;upland soils;utilization;oryzapoaceae;cyperales;monocotyledons;angiosperms;spermatophyta;plants;eukaryotes;anthropogenic soil types;cultural soil types;ecological soil types;genetic soil types;hill soils;paddy;pasture soils;physiographic soil types;red earths

摘要：

The size distribution of water-stable aggregates and the variability of organic C, N and P contents over aggregate size fractions were studied for orchard, upland, paddy, and grassland soils with high, medium, and low fertility levels. The results showed that >5 mm aggregates in the cultivated upland and paddy soils were 44.0% and 32.0%, respectively, less than those in the un-tilled orchard soil. Organic C and soil N in different size aggregate fractions in orchard soil with high fertility were significantly higher than those of other land uses. However, the contents of soil P in different size aggregates were significantly greater in the paddy soil as compared to the other land uses. Soil organic C, N and P contents were higher in larger aggregates than those in smaller ones. The amount of water-stable aggregates was positively correlated to their contribution to soil organic C, N and P. For orchard and grassland soils, the >5 mm aggregates made the greatest contribution to soil nutrients, while for upland soil, the 0.25-0.053 mm aggregates contributed the most to soil nutrients. Therefore, the land use with minimum disturbance was beneficial for the formation of a better soil structure. The dominant soil aggregates in different land use types determined the distribution of soil nutrients. Utilization efficiency of soil P could be improved by converting other land uses to the paddy soil.Digital Object Identifier http://dx.doi.org/10.1016/S1002-0160(10)60056-2

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Impact of land use and soil fertility on distributions of soil aggregate fractions and some nutrients.

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