Pedosphere 20(5): 666--673, 2010
ISSN 1002-0160/CN 32-1315/P
©2010 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Impact of land use and soil fertility on distributions of soil aggregate fractions and some nutrients
LIU Xiao-Li1, HE Yuan-Qiu1, H. L. ZHANG2, J. K. SCHRODER2, LI Cheng-Liang1, ZHOU Jing1 and ZHANG Zhi-Yong3
1 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
2 Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 70478-6082 (USA)
3 Institute of Agricultural Resource and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014 (China)
ABSTRACT
      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.
Key Words:  fertility levels, land use types, red soil, water-stable aggregates
Citation: Liu, X. L., He, Y. Q., Zhang, H. L., Schroder, J. K., Li, C. L., Zhou, J. and Zhang, Z. Y. 2010. Impact of land use and soil fertility on distributions of soil aggregate fractions and some nutrients. Pedosphere. 20(5): 666-673.
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