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系统认识和掌握盐渍土的空间分布特征,是治理改良盐渍土的基础。在研究区内布设60个采样点,分层(0~100 cm)测定了土壤全盐量,应用地统计学方法结合GIS技术对其空间分布特征进行了研究。结果表明:30~50 cm和70~100 cm土层盐分均属于中等变异性。其他土层盐分属于强变异性。土壤含盐量的水平分布特点是:北侧土壤盐分变化大于南侧,东侧土壤盐分变化大于西侧。土壤含盐量的垂直分布特点是:从0~5 cm到70~100 cm土层盐分含量逐渐变小。研究区土壤分别属于非盐化土、轻度、中度、重度盐渍土和盐渍土,并且每个盐渍化土类型面积占研究区总面积的17%、14%、26%、31%、11%。研究区土壤类型总体属于重度盐渍化土,且呈现一定的盐分表聚趋势。
Systematic understanding and grasping the spatial distribution of saline soil is the basis for the improvement of saline soil. Sixty sampling sites were laid in the study area, and the total salinity of the soil was determined by stratification (0 ~ 100 cm). The spatial distribution characteristics of the soil were studied by using geostatistics and GIS. The results showed that the salt content in the soil layers of 30 ~ 50 cm and 70 ~ 100 cm belonged to moderate variability. Other soil salts belong to strong variability. The horizontal distribution of soil salt content is characterized by: the change of soil salinity in the north is larger than that in the south, the change of soil salinity in the east is larger than that in the west. The vertical distribution of soil salt content is that the salt content of 0 ~ 5 cm to 70 ~ 100 cm soil layer gradually becomes smaller. Soil in the study area belongs to non-saline soil, mild, moderate and severe saline soil and saline soil respectively, and the area of each saline soil type accounts for 17%, 14%, 26%, 31% of the total area of the study area %, 11%. The soil types in the study area belong to heavy saline soil in general, and show a certain trend of salt content.