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基于遥感数据,结合地下水位观测资料,本文对渭-库绿洲土壤盐渍化与地下水的关系进行了定量研究,并探讨土壤盐渍化的逆向演替过程。研究表明:渭-库绿洲在地下水埋深2.3~2.7 m区间,盐渍地面积占的比例较高,在地下水埋深2.7~3.4 m区间,盐渍地面积占的比例相对较低;渭-库绿洲部分地方地下水位已低于影响地表盐渍化的水位临界值(4.66 m),地下水矿化度低于3 g/L,研究区整体处于有利于土壤盐渍化逆向演替的环境之中;土壤盐渍化的逆向演替过程具有时空特征,由绿洲上部向下部,内部向外部逐步发生逆向演替。
Based on the remote sensing data and the observation data of groundwater level, this paper quantitatively studied the relationship between soil salinization and groundwater in Wei-Ku reservoir, and discussed the reverse succession process of soil salinization. The results show that the proportion of salinized land is high in the range of 2.3-2.7 m for groundwater, and the proportion of salted land is relatively low in the range of 2.7-3.4 m for groundwater; The groundwater table in some parts of the reservoir oasis is lower than the critical value (4.66 m) which affects the surface salinization, and the salinity of groundwater is less than 3 g / L. The study area is in an environment favorable for the reverse succession of soil salinization ; The process of the reverse succession of soil salinization has the characteristics of space-time, from the upper part of the oasis to the lower part, the reverse succession gradually occurs from the inside to the outside.