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基于区域变量理论,采用GPS定位技术,于2005年7-8月,对岳普湖县土壤进行定点取样,土壤取样层次为0-30cm、30-60cm、60-100cm和100-200cm,共取样点118个。在GIS技术支持下,通过地统计学半变异函数和Kriging空间插值,定量分析岳普湖县不同层次土壤盐分的空间异质性。结果表明:岳普湖县各层土壤含盐量普遍较高,均值分别为17.44,11.67,9.10,8.14g/kg,且变异性大、变异系数为0.877～0.959,接近于强变异性。0-30cm、30-60cm和60-100cm土壤盐分的理论分布模型属于指数模型,100-200cm属于球状模型。各层土壤盐分空间相关性均属于中等程度。不同土层之间的空间自相关范围具有明显的差异,由表层至深层,土壤盐分的自相关范围逐渐增大。在空间格局上,岳普湖县土壤盐渍化极其严重,0-30cm土层,强度盐渍化面积占总面积的40.42%,盐土47.87%。水平方向上,土壤盐分的高值区主要分布在岳普湖镇、岳普湖乡、色也克乡、阿其克乡和铁热木乡。研究成果可为岳普湖县防治土壤次生盐碱化及其合理利用水土资源方面提供决策依据。
Based on the theory of regional variables, the GPS positioning technique was used to carry out the site-specific sampling of the soil in Yuepuhu County from July to August in 2005. The soil sampling levels were 0-30cm, 30-60cm, 60-100cm and 100-200cm, 118 points. With the support of GIS technology, the spatial heterogeneity of soil salinity at different levels in Yuepuhu County was quantitatively analyzed by geostatistical semi-variogram and Kriging interpolation. The results showed that the salt content of soil in Yupuhu County was generally high, with mean values of 17.44, 11.67, 9.10 and 8. 14 g / kg, respectively. The variability was large and the coefficient of variation was 0.877 ~ 0.959, close to strong variability. The theoretical distribution model of soil salinity at 0-30cm, 30-60cm and 60-100cm belongs to the exponential model, and 100-200cm belongs to the spherical model. Spatial correlations of soil salinity at all levels were moderate. The spatial autocorrelation ranges of different soil layers have obvious differences. From the surface to the deep layers, the range of soil salinity increases gradually. In the spatial pattern, the soil salinization in Yuepuhu County is extremely serious. In 0-30cm soil layer, the area of salinization intensity accounts for 40.42% of the total area and 47.87% of saline soil. In the horizontal direction, the high value areas of soil salinity are mainly distributed in Yuepuhu Town, Yopuhu Township, Yeyahuke Township, Aqiku Township and Tiewenmu Township. The research results may provide decision-making basis for prevention and control of secondary salinization of soil and its rational utilization of water and soil resources in Yuepuhu County.