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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