Abstract:

Based on field sampling, laboratory experiment and geostatistics analysis, we studied on the spatial distribution dynamics of soil organic matter and soil moisture of the topsoil at desertification combating areas in Ningxia. Data showed that the soil organic matter fitted normal distribution, the content of soil organic matter was low, and the average value of soil organic matter was 1.34 g·kg^-1. With the Kriging analysis, results showed that the content of soil organic matter decreased from the north to the south in this study area and the distribution of soil organic matter was zonal with great spatial heterogeneity. The content of soil organic matter in the northwest of the study area was lowest, among 0.8~1.05 g·kg^-1, and the content of soil organic matter in the south of the study area was high, among 2.20~2.36 g·kg^-1, but the distribution was low. The soil water content (SWC) fitted normal distribution, and was very low, average 0.75%. With the Kriging analysis, results showed that SWC of the topsoil in the study area had spatial heterogeneity, and decreased from the north to the south. The soil organic matter and the soil moisture all had higher spatial autocorrelation. The spatial correlation range of the soil organic matter was relatively large, 36.69 m. The spatial correlation range of the soil moisture was small, 8.48 m.

Key words: Soil organic matter, Soil moisture, Spatial heterogeneity, Geostatistics analysis, Desertification combating area

摘要：

为探讨宁夏河东沙地沙漠化治理区表层土壤有机质含量和土壤含水量的空间分布规律,选取表层土壤作为研究对象,通过野外采样、室内试验以及地统计学数据分析,得出以下结果:研究区内有机质含量为0.5~3.48 g·kg^-1,均值为1.34 g·kg^-1,含量较低,Kriging 插值结果表明,有机质含量从北向南呈递减的态势,呈带状分布,空间变异较高,该研究区有机质含量最低是在西北地区,含量普遍在0.8~1.05 g·kg^-1,有机质含量高的地区位于研究区域南部,分布较少,此地有机质含量在2.20~2.36 g·kg^-1之间。土壤含水量较低,平均值为0.75%,Kriging 插值结果表明,该研究区表层土壤含水量的分布存在空间变异,由北向南递减。有机质含量和土壤含水量均表现出较高的空间自相关性,土壤有机质含量的空间相关范围相对较大,为36.69 m,土壤含水量的空间自相关距离较小,为8.48 m。

关键词: 土壤有机质, 土壤水分, 空间异质性, 地统计分析, 防沙治沙