内蒙古师范大学学报(自然科学汉文版)

利用描述性统计分析、地统计学、冗余分析等方法，探究锡林郭勒盟的草甸草原、典型草原和荒漠草原在0～50 cm土层土壤水分和盐分的含量变化、空间变异性以及影响因子。研究结果表明：（1）土壤水分含量在0～<5 cm表现为典型草原>草甸草原>荒漠草原，其余土层含水量均以草甸草原最高、荒漠草原最低；（2）在30 cm以下的土层中，三种草原均呈重度盐渍化水平，在30 cm以上的土层中，各草原基本为中度或重度盐渍化水平，总体上荒漠草原的盐渍化比其他两类草原要低；（3）土壤水分含量除20～<30 cm属于中等程度变异外，其余土层均为强变异类型；土壤含盐量除表层0～<5 cm属于中等程度变异外，其余深度土层均为强变异类型；（4）土壤水分含量高值斑点在0～<20 cm土层变化剧烈，在20～50 cm趋于稳定；土壤盐分含量在0～<5 cm土层变化明显，在5～<20 cm有所下降，20 cm以下随着土层深度的增加，出现局部增大的趋势；（5）各亚型草原土壤含水量均与土壤全氮呈正相关性，与Simpson指数呈负相关，土壤含盐量均与土壤含水量呈正相关。各层土壤水分含量均以荒漠草原最低。土壤pH值是影响草甸草原和典型草原土壤盐分含量的主要因子，土壤全磷是影响草甸草原土壤水分含量的主要因子，在荒漠草原中土壤水盐因子互为主要影响因子。

Using methods such as descriptive statistical analysis, geostatistics, and redundancy analysis, this paper explored the changes in soil moisture and salinity content, spatial variability, and influencing factors in the meadow steppe, typical steppe, and desert steppe of Xilingol at depths of 0 to 50 cm. The research findings are as follows.(1) Soil moisture content in the 0 to <5 cm layer is ranked as typical steppe > meadow steppe > desert steppe, while for the other soil layers, the meadow steppe has the highest moisture content and the desert steppe has the lowest.(2) In the soil layers below 30 cm, all three grassland types exhibit severe salinization levels, while in the layers above 30 cm, the grasslands are generally at moderate to severe salinization levels. Overall, the salinization of the desert steppe is lower than that of the other two types of grasslands.(3) The soil moisture content shows strong variability in all layers except for the 20 to <30 cm layer, which has moderate variability; the soil salinity exhibits strong variability in all depths except for the surface layer(0 to <5 cm), which has moderate variability.(4) High-value spots of soil moisture content show significant variability in the 0 to <20 cm layer, while they tend to stabilize in the 20 to 50 cm layer. Soil salinity exhibits noticeable changes in the 0 to <5 cm layer, decreases from 5 to <20 cm, and shows a trend of local increases with increasing soil depth below 20 cm.(5) The soil moisture content in each grassland subtype is positively correlated with total nitrogen and negatively correlated with the Simpson index. Soil salinity is positively correlated with soil moisture content, with desert steppe showing the lowest moisture content across all layers. Soil pH is the main factor influencing soil salinity in meadow and typical steppes, while total phosphorus is the primary factor affecting soil moisture content in meadow steppe. In desert steppe, soil moisture and salinity factors mutually influence each other as major contributing factors.