关键词: 吉林省, 时空演变, 环境污染, 空间计量

Abstract: Oasis reservoir, a node of hydraulic system in the inland river watershed, plays an important role in transporting water in the process of regional agriculture development. We examined the effect of reservoir on soil salt accumulation with the Binghu Reservoir and Liuchengzi Reservoir in the Sangong River watershed as cases. The spatial variability of soil salinity around reservoir under two landscape types was studied by classical statistics, geostatistics and GIS. The results showed that: (1) Salt contents of soil profiles were higher in the natural landscape type around Liuchengzi Reservoir (0-20 cm: 20.77 g·kg^-1; 20-40 cm: 14.96 g·kg^-1; 40-60 cm: 16.9 g·kg^-1) than that of Binghu Reservoir (0-20 cm: 7.81 g·kg^-1; 20-40 cm: 5.66 g·kg^-1; 40-60 cm: 5.24 g·kg^-1) dominated by the irrigation landscape. Soil salt content showed a great variability (CV>100%) in each soil layer around the Binghu Reservoir and was moderately variable (10%<CV<100%) around the Liuchengzi Reservoir. (2) Soil salt content had a moderate spatial autocorrelation (0.25<C₀/(C₀+C)<0.75) around both reservoirs. Spatial dependence of soil salt content was mainly due to random factors resulted from the strong anthropogenic activities around Binghu Reservoir. The influence of structural factors gradually increased with soil depth. In contrast, the spatial variability of soil salinity was mainly induced by structural factors around Liuchengzi Reservoir. (3) There was “salt island” phenomenon around the agricultural reservoirs. Non-saline soil was a major type around the Binghu Reservoir, with the area of which increased with soil depth. However, saline soil was a dominant type around the Liuchengzi Reservoir, whose area increased with soil depth.

Key words: spatial-temporal evolution, Jilin Province., spatial econometric, environment pollution