关键词: 土壤盐分, 空间变异, 地统计学, Kriging插值, 塔里木河下游

Abstract: Soil salinization was one of the main factors that caused the natural vegetation degradation in the lower reaches of the Tarim River. The study on spatial variability of soil salinity in the lower reaches of the Tarim River was carried out for providing the important information for the restoration and rebuilding of the degraded vegetation. Based on geostatistics method, spatial heterogeneity pattern of salinity in surface soil was studied in this paper. The result showed that the salt content in study area was relatively high. The spatial heterogeneity of soil salt was obvious and there was a spatial correlation pattern. Meanwhile the spatial distribution of soil salinity was mainly influenced by the structural factors. The Kriging interpolation result showed salinity in surface soil presented a strip distribution pattern in the study area, while it presented a block distribution pattern in local regions. The salt contents at the sections near the Daxihaizi Reservoir and Taitema Lake were higher than that beyond them, and they declined with increasing distance away from the river channel. Furthermore, groundwater level of the sampling plots near the river channel was higher than that of the sampling pots farther away from the river channel, leading to the decline of the species numbers and vegetation coverage farther away from the river channel.

Key words: soil salinity, spatial variability, geostatistics, Kriging, the lower reaches of the Tarim River