论文部分内容阅读
运用遥感与GIS技术,结合地统计学方法研究了三工河流域下游阜北绿洲近23 a来表层土壤(0~20 cm)盐分动态特征及其主导因素。结果表明:①研究区景观类型间相互转换频繁,区域绿洲化进程的同时,荒漠化也在加重,并且绿洲化进程强于荒漠化;②通过对1982年和2005年土壤盐分的理论模型拟合,符合指数模型,并且,F检验达到极显著水平;③Kriging插值及其与同期的绿洲景观类型图进行叠加运算表明,在自然和人为作用下,区域土壤盐化程度加重,高盐区面积增加,低盐区面积减少,土壤盐分在20 g.kg-1以上的分布面积增加了15.36%,而在5~10 g.kg-1范围减少43.85%;④水库输水灌溉是引发区域地下水位抬升的直接因素,间接导致土壤盐渍
The remote sensing and GIS techniques were used to study the dynamic characteristics and the dominant factors of salinity in the topsoil (0-20 cm) in Fuxin oasis in the lower reaches of the Sangong River Basin in the past 23 years. The results show that: (1) the landscape types of the study area are interchanged frequently and the process of regional oasis is becoming more and more desertified; meanwhile, the process of oasis is stronger than the desertification. (2) By fitting the theoretical model of soil salinity in 1982 and 2005, The Kriging interpolation and its overlay with the oasis landscape type map of the same period show that under natural and man-made effects, the degree of soil salinization in the region aggravates, the area of high salt area increases, and the salt content of low salt The area of soil salinities increased by 15.36% in the area above 20 g · kg-1 and decreased by 43.85% in the range of 5 ~ 10 g · kg-1. ④ The water transfer in the reservoir was the direct result of the elevation of groundwater level in the area Factors that indirectly lead to soil salinization