| 王金贵,王益权,徐海,冯小龙,王永健,伏耀龙,张育林.关中农田土壤有机质和碳酸钙空间变异特征及其机理分析[J].干旱地区农业研究,2009,27(6):23~26 |
| 关中农田土壤有机质和碳酸钙空间变异特征及其机理分析 |
| Spatial variability of soil organic matter and calcium carbonate and its reason in Guanzhong farmland |
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| DOI：10.7606/j.issn.1000-7601.2009.06.05 |
| 中文关键词: 有机质 碳酸钙 空间变异 人为活动 |
| 英文关键词:organic matter calcium carbonate spatial variability human activities |
| 基金项目:陕西省农业科技推广项目“关中灌区小麦玉米高产技术”(14220210) |
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| 中文摘要: |
| 为了研究人为活动对于农田土壤有机质含量和碳酸钙空间变异性的作用与影响,在陕西杨凌杜寨村研究了农田土壤有机质和碳酸钙空间变异性,并对其变异机理进行了分析。试验表明:表层0~10 cm和底层20~40 cm土壤有机质平均值分别20.64 g/kg和10.81 g/kg,变异系数为0.087和0.013,均属弱变异程度;亚表层10~20cm土壤有机质平均值为16.96 g/kg,变异系数为0.130,属中等变异程度;碳酸钙均属弱变异程度。经过对土壤特性空间分布等值线图的分析得出:在水平方向上,土壤有机质和碳酸钙均具有相同的变异规律,距离村庄越近土壤有机质和碳酸钙含量越高,以村庄为圆心土壤有机质和碳酸钙含量呈同心圆式的空间变异特征。 |
| 英文摘要: |
| n order to study the effect and influence of human activities on spatial variability of soil organic matter and calcium carbonate in farmland,an experiment was made in the farmland of Duzhai Village,Yangling,Shaanxi,and meanwhile,the variation mechanism was analyzed.The results showed that the average soil organic matter contents in top soil and substratum soil were 20.64 g/kg and 10.81 g/kg,while the coefficients of variation were 0.087 and 0.013 respectively,belonging to a low level;the average soil organic matter content in subsurface was 16.96 g/kg belonging to a moderate level;a low level of variation coefficient of calcium carbonate appeared in all the soil layers.Through analyzing the contour map of soil spatial variability,the same changing law was found in soil organic matter and calcium carbonate content in the horizon direction,which showed that higher soil organic matter and calcium carbonate content appeared in the points closer to the village,forming a concentric circle. |
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