论文部分内容阅读
为探讨宁夏河东沙区典型沙漠化治理区风沙土土壤含水量的变化规律,选取了研究区表层及30cm深度的风沙土,采用烘干法及TDR300对土壤含水量进行监测,研究结果显示:1)表层土壤含水量4月底、5月底、6月底平均值较高,7月底土壤含水量最低,8月底和9月底逐渐开始增加。30cm的土壤含水量平均值4月底、8月底及9月底较高,5-7月相对较低。10cm和30cm的土壤含水量均属中等变异,且前者变异系数大于后者。2)不同时间的表层土壤含水量及30cm深处的土壤含水量均表现出强烈的空间自相关。30cm的空间变异程度低于10cm的。而表层土壤含水量空间自相关性较强。3)不同时间的表层土壤含水量的空间分布明显不同。不同季节的30cm的土壤含水量空间异质性较相似,6月底、7月底、8月底和9月底空间分布图相似,4月底和5月底,研究区北部土壤含水量空间分布有差异,其它区域空间分布斑块也很相似。30cm处的土壤含水量空间分布基本表现为南部低地与西部坡中部土壤含水量较高,坡中部偏东区域及坡上部土壤含水量较低。
In order to investigate the variation law of soil water content of sandy soil in typical desertification control area of Hedong Sandy Area in Ningxia, the sandy soil of 30 cm depth and surface layer of the study area were selected. The soil moisture content was monitored by drying method and TDR300. The results showed: 1) The topsoil moisture content was the highest at the end of April, the end of May and the end of June, the lowest at the end of July, and gradually began to increase at the end of August and the end of September. The average soil water content of 30 cm was higher at the end of April, the end of August and the end of September, and from May to July was relatively lower. The soil water content at 10 cm and 30 cm was moderately variable, and the former had a larger coefficient of variation than the latter. 2) Surface soil moisture at different times and soil moisture at 30cm depth showed strong spatial autocorrelation. The degree of spatial variation of 30 cm is less than 10 cm. The spatial autocorrelation of surface soil moisture is strong. 3) The spatial distribution of surface soil moisture is obviously different at different times. The spatial heterogeneity of soil moisture at 30 cm was similar in different seasons. The spatial distribution maps of the end of July, the end of August, the end of August and the end of September were similar. At the end of April and the end of May, the spatial distribution of soil moisture in the northern part of the study area was different. Spatial distribution of patches is also very similar. The spatial distribution of soil water content at 30cm showed that the soil moisture content in the lowlands of the south and the middle of the western slope was higher than that in the east of the slope and the upper part of the slope.