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土壤属性空间分异研究是土壤调查、土壤资源利用与保护的重要依据。结合现有土壤资料和剖面数据,利用农作物长势信息探测稻—麦轮作种植的平原农区土壤属性的空间变化状况。结果表明:A1和A2区成土母质为湖相沉积物,A3区为黄淮冲积—海相沉积物,B区为黄泛冲积物。A1、A2、B2和A2与B2的过渡区土壤质地为黏土,A3和A1与B1的过渡区为黏壤土,B1区为壤土,B1与B2的过渡区为上壤下黏。A1和B1及其过渡区的地下水埋藏深度大于120 cm,A2区约70 cm,A3区约60 cm,B1与B2的过渡区约80~90 cm,B2和A2与B2的过渡区约55~70 cm。农作物长势信息可以指导中尺度平原区土壤属性空间分异规律研究,如成土母质、地下水埋藏深度和土壤质地等,将有利于提高平原区土壤调查的效率与精度。
Spatial variability of soil properties is an important basis for soil investigation, soil resource utilization and protection. Based on the available soil data and profile data, the spatial variability of soil properties in plain agricultural areas planted by rice-wheat rotation was probed using crop growth information. The results show that the alluvial soil parent materials in the A1 and A2 regions are lacustrine sediments, the A3 region is the Huanghuai alluvial-marine sediment, and the B region is the yellow alluvial sediment. The soil texture of the transitional areas A1, A2, B2 and A2 and B2 is clay, the transitional areas of A3 and A1 and B1 are clay loam, B1 is loamy soil, and B1 and B2 are underlying soil. The buried depth of groundwater in areas A1 and B1 and their transitional area is more than 120 cm, the area A2 is about 70 cm, the area A3 is about 60 cm, the transition area between B1 and B2 is about 80-90 cm, and the transition area between B2 and A2 is about 55 ~ 70 cm. Crop growth information can guide the study of the spatial heterogeneity of soil properties in mesoscale plain areas, such as soil parent materials, depth of groundwater burial and soil texture, which will be helpful to improve the efficiency and accuracy of soil survey in plain areas.