安固里淖干湖区土壤理化因子空间分布特征

Spatial Distribution of Soil Physical and Chemical Factors in the Angulinao Playa

对安固里淖干湖区的土壤粒度组成、含盐量、含水量、有机质和p H的空间分布特征进行了研究。结果表明,湖区内土壤主要以粉粒（0.002-0.05 mm）为主,湖区外围土壤主要以粉粒（0.002-0.05 mm）、极细砂（0.05-0.1 mm）和细砂（0.1-0.25 mm）为主,湖区东部土壤比西部土壤质地更细。土壤含水量由湖区内部向外围逐渐减小,但湖岸边缘土壤含水量最高。研究区土壤盐碱化现象明显,含盐量和p H都较高,湖区东部土壤含盐量和p H都高于西部。研究区土壤有机质含量总体偏低,与西部相比,干湖区东部土壤有机质含量较高。研究区土壤含盐量、含水量与p H显著正相关,有机质含量与p H显著负相关。

In this study, the spatial distribution of soil particle-size, salinity, water contents, organic matter contents, and p H of surface soil in the Angulinao playa were examined. The results showed that the soils in the dry lake were mainly composed by silt（0.002-0.05 mm）, while the soils around the dry lake mainly included silt（0.002-0.05 mm）, very fine sand（0.05-0.1 mm） and fine sand（0.1-0.25 mm）. The soil texture in the east part of the dry lake was finer than that in the west part. Water contents of soil approximately decreased from center to periphery in the dry lake, but the highest water contents were occurred at the edge of the dry lake.Soil salinization was severe, the salinity and p H were high in the study area. Salinity and p H of soil samples in the eastern area were higher than those in the western area. Soil organic matter contents were low, while organic matter contents of soil samples in the eastern area were higher than those in the western area. Salinity, water contents and p H were closely correlated with others, but organic matter contents were only highly negative related to p H.