[1]GENG Ren,ZHANG Guang-hui,YU Yao-chuang,et al.Seasonal Variability in Physical Properties of Topsoil in the Typical Croplands in Northern Shaanxi Province[J].Research of Soil and Water Conservation,2014,21(04):1-6.

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Seasonal Variability in Physical Properties of Topsoil in the Typical Croplands in Northern Shaanxi Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 04 Page number: 1-6 Column: Public date: 2014-08-28

Title:: Seasonal Variability in Physical Properties of Topsoil in the Typical Croplands in Northern Shaanxi Province

Author(s):: GENG Ren¹, ZHANG Guang-hui^1,2, YU Yao-chuang², WANG Hao¹; 1. School of Geography, Beijng Normal University, Beijing 100875, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Minister of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: loess hill region; soil physical properties; cropland; seasonal variability

CLC:: S157.1

DOI:: -

Abstract:: Soil physical properties play an important role in affecting soil hydrology and erosion. This paper studied the seasonal variations in soil water content, soil bulk density, water-stable aggregate and soil cohesion in the croplands of corn, millet, soybean and potato in Ansai, Shaanxi Province. The results showed that the seasonal variations in soil physical properties of different croplands were almost similar. Soil water contents showed obvious peak and valley caused by the changes in precipitation. Soil bulk density and soil cohesion generally increased in the growth season and decreased rapidly after tillage and harvest. However, water-stable aggregate increased monotonically. The paired T test showed that there was no significant difference(0.29≤P≤0.99) in soil water content except those in corn and mille fieldst(P=0.04). For soil bulk density, there was no significant difference(0.07≤P≤0.86) between croplands besides those in millet and soybean fields(P=0.03). With respect to aggregate stability, soybean filed was significantly different from other croplands(0.01≤P≤0.03). No significant difference was detected among different croplands in soil cohesion(0.16≤P≤0.53).Tillage operation was the main reason for the decreases in soil bulk density and soil cohesion. The results have significant implications to analyze the seasonal changes in soil hydrology and erosion process of croplands.

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