延河流域不同植被带土地利用方式的土壤水分分析评价

以延河流域不同植被带上的三个小流域为研究对象，引用土壤湿度综合指数作为土壤水分评价指标，结合不同植被带土地利用分布特征与相应土壤含水量对延河流域土壤水分进行评价分析，为该区域不同植被带水土资源的合理利用提供科学依据。结果表明:三个植被带均处于极干旱状态，土壤湿度森林草原带 > 森林带 > 草原带；其中森林带以林地为主，森林草原带以林地和草地共同起主导作用，草原带以草地为主；不同植被带土壤含水量差异显著，森林带最高，其次为森林草原带，草原带最低；对不同植被带土壤水分的剖面变化分析表明，0—200 cm土层中土壤含水量随着深度增加呈现增长趋势。4种土地利用方式中，耕地的土壤含水量显著高于其他三种土地利用方式，这主要是与耕地坡度较小和修建梯田有关，同时还与农作物的耗水量相对较小有关。林地和草地土壤含水量无显著差异，灌木地土壤含水量最小。

Evaluation of Soil Moisture of Land Use under Different Vegetation Zones in Yanhe Basin

The study took three small watersheds in different vegetation zones of Yanhe River valley as the research areas. It treated SHI as soil evaluation index, and took the soil moisture combination with land use distribution of different vegetations and its soil moisture as the method, which made an analysis of the soil water content along the river basin. In addition, a scientific basis for the rational use of water and soil resources of different vegetation zone was provided. The results show that the three vegetation zones were extremely dry, the order of soil moisture was forest steppe region, forest region and grassland. The forest region was based on woodland, forest steppe region was forestland and grassland, steppe region was grass. There is significant difference among those soil water contents, forest region was higher than forestland and grassland, and grassland was the lowest. According to the analysis on soil water content profile in different vegetation zones, it showed that soil water content increased with depth in 0—200 cm soil layer and had a growth tendency. Therefore, among four ways of land use, soil moisture content of farmland was significantly higher than the other land uses, not only because it was mainly affected by smaller slope and terraces, but also the smaller crop water consumption. There was no significant difference in soil water content between forestland and grassland. Moreover, soil water content of shrub land is minimal.