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在2003年6月~10月选择农田、草地和碱斑地作为典型的土地利用方式,对0~120 cm土层水盐时空动态进行了对比分析,结果发现:农田和草地土壤剖面含水量都有“上升—下降—上升”的趋势,但是在8月中旬之前农田含水量高于草地,而碱斑地含水量的变化呈“U”型。三种土地利用方式土壤剖面含盐量的变化趋势与含水量相反;土壤剖面6月7日含盐量最大,10月17日最小;农田和碱斑地土壤剖面各层含盐量在8月8日开始上升,而草地在7月7日已开始上升;从垂直剖面看,农田各个时刻土壤含盐量都随剖面深度的增加而上升,碱斑地则随着剖面深度的增加而下降,草地在各个时刻土壤剖面含盐量均呈先上升后下降型,在土壤剖面有峰存在。采样期内,草地有良好的蓄水作用,而农田土壤剖面含盐量下降幅度最大,水分、盐分在土壤剖面运移剧烈。
From June to October 2003, farmland, grassland and alkali spot were selected as typical land use patterns to compare the temporal and spatial dynamics of water and salinity in 0 ~ 120 cm soil layer. The results showed that: There was a trend of “rising-falling-rising”, but before mid-August, the water content of farmland was higher than that of grassland, while the change of alkali spot water content was “U”. The change trend of soil salt content in the three land use patterns is opposite to that of water content. The soil salt content is the highest on June 7 and lowest on October 17, and the salt content in the soil layers of farmland and alkali spot soil profile in August The grassland started to rise on the 8th, and the grassland began to rise on July 7. From the vertical section, the salt content in the soil increased with the depth of the section at all times. The amount of alkali spot decreased with the increase of section depth, The soil salt content of the soil profile in the grassland at all times showed the first increase and then the decline, and there was a peak in the soil profile. During the sampling period, grassland had a good water storage effect, while the salt content in the soil profile of farmland had the largest drop, and the moisture and salt moved fiercely in the soil profile.