| 摘要: |
| 在人工模拟降雨条件下，采用接触式测针糙度仪量测法，分析了土壤质地、土壤容重和土壤含水量对地表糙度变化的影响。结果表明，在1.0 mm/min雨强下，随土壤物理性粘粒含量的增加，地表糙度变化呈增大的趋势；随土壤容重的增加，地袁糙度的变化总体上呈减小的趋势，且当土壤容重相同时，直线坡面和耙耱地坡面地表的糙度变化均高于人工锄耕和等高耕作坡面；随土壤含水量的增加，地表糙度的变化总体上也呈减小的趋势，且在土壤含水量相同时，直线坡面地表的糙度变化较其他处理高。并在此基础上，就上述因子相互作用对地表糙度变化的影响进行了量化分析，表明土壤含水量和土壤容重与地表的糙度变化呈负相关,而土壤孔隙度与地表糙度变化呈正相关。 |
| 关键词: 降雨 地表糙度 土壤质地 土壤容重 土壤含水量 |
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| 基金项目:中国科学院“知识创新”工程项目“农果复合型生态农业模式建设与示范”(KZCX1-06-02-03) |
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| Research about effect of soil physical properties on the variation of surface roughness under the condition of rainfall |
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| Abstract: |
| On the basis of artificial rainfall experiments and contact roughness meter ,the effect of soil physical properties on surface roughness was studied. Under the condition of rainfall density of 1. 0 mm/min,the variation of roughness increased with the increase of soil physical clay gradually. The variation of roughness decreased generally with the increase of soil bulk density during the course of rainfall. The variations of straight slope and rake slope were higher than those of artificial hoe slope and contour tillage slope when soil bulk density was the same. The variation of roughness also decreased generally with the increase of soil moisture content during the course of rainfall and the variations of straight slope were higher obviously than those during the course of the same soil moisture content. At the same time, the quantitative analysis was done on the effect of the above soil physical factors on the variation of surface roughness. The results were that the variation of roughness had negative relationship with soil moisture content and soil bulk density ,and had positive relationship with soil porosity. |
| Key words: rainfall surface roughness soil texture soil bulk density soil moisture content |
