| 陕北典型农地表层土壤物理性质季节变化 |
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| 引用本文： | 耿韧,张光辉,,郁耀闯,王浩.陕北典型农地表层土壤物理性质季节变化[J].水土保持研究,2014,21(4):1-6. |
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| 作者姓名： | 耿韧 张光辉 郁耀闯 王浩 |
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| 作者单位： | 1. 北京师范大学 地理学与遥感科学学院, 北京 100875;2. 中国科学院 水利部水土保持研究所, 陕西 杨凌 712100 |
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| 摘 要： | 土壤物理性质是影响土壤水文、侵蚀过程的重要因素。为此系统研究了陕北安塞4种典型农地（玉米、谷子、大豆和土豆）的土壤含水量、容重、水稳性团聚体和粘结力的季节变化特征。结果表明:4种农地表层土壤物理性质随季节变化的趋势大致相同，土壤含水量随降雨量的变化呈现出明显的峰谷。土壤容重和土壤粘结力在农作物生长阶段大体呈上升趋势，翻耕和收获后显著下降。水稳性团聚体则呈现单调递增趋势。在0.05显著性水平下的配对样本T检验显示:土壤含水量除玉米地和谷子地外（P=0.04），其他农地土壤含水量之间无显著差异（0.29≤P≤0.99）；土壤容重除谷子地和大豆地外（P=0.03），其他农地之间无显著差异（0.07≤P≤0.86）；土豆地与其他农地的水稳性团聚体之间有显著性差异（0.01≤P≤0.03）；各农地土壤粘结力之间无显著性差异（0.16≤P≤0.53）。土壤含水量的变化趋势与降雨的变化趋势基本一致，农事活动所引起的土壤扰动是土壤容重和粘结力变化的主要原因。研究结果对于分析农地水文、侵蚀过程的季节变化特征具有重要的意义。
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| 关 键 词： | 黄土丘陵区 土壤物理性质 农地 季节变化 |
Seasonal Variability in Physical Properties of Topsoil in the Typical Croplands in Northern Shaanxi Province |
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| GENG Ren,ZHANG Guang-hui,,YU Yao-chuang,WANG Hao.Seasonal Variability in Physical Properties of Topsoil in the Typical Croplands in Northern Shaanxi Province[J].Research of Soil and Water Conservation,2014,21(4):1-6. |
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| Authors: | GENG Ren ZHANG Guang-hui YU Yao-chuang WANG Hao |
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| Institution: | 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 |
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| 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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| Keywords: | loess hill region soil physical properties cropland seasonal variability |
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