环渤海低平原区土壤容重与含水量空间结构性研究

目的]查明环渤海低平原区土壤物理性质的空间特征,为土壤盐渍化的防治和农田合理灌溉提供依据。方法]选取深县、南皮和海兴3个典型区,运用传统统计学和地统计学相结合的方法,研究不同土层土壤容重和含水量的空间规律。结果]在垂直方向上,研究区各层土壤容重随着深度的增加,逐渐趋于稳定,深县、南皮和海兴为1.51、1.53和1.53 g/cm3,且3个地区的土壤容重均属于中等变异强度;在山前平原至滨海平原的水平方向,0～20、20～60和0～60 cm3层位的土壤容重均表现逐渐增大的趋势。3个典型区的含水量在垂直方向上都表现为逐渐增加态势,且都属于中等变异强度。结论]整个地区的土壤含水量变异大于容重变异,容重在垂直方向上的离散性和变异性都较小。

Spatial Structure of Water Content and Bulk Density of Soil in Bohai Sea Low Plain

Objective] The soil physical properties of the spatial characteristics in Bohai Sea low plains were studied to provide a reasonable basis for soil salinity control and farmland irrigation.Method] With the selection of three typical areas in the Bohai Sea low plain,such as Shen County,Nanpi and Haixing,the traditional statistics and geostatistics method was used to study the soil spatial variability in different soil bulk density and water content.Result] In the vertical direction,soil bulk density of each layer gradually stabilized with depth,with Shen County,Nanpi and Haixing as 1.51,1.53,1.53 g/cm3.And all the variations were moderate.In the horizontal direction from piedmont lain to the coastal plain,the soil bulk density of the three layers such as 0-20,20-60 and 0-60 cm showed a gradually increasing trend.The water content of the three typical areas in the vertical direction showed an increasing trend and the variations were moderate.Conclusion] The variation of soil water content was greater than that of bulk density while the discreteness and the variability of the later was small in the vertical direction.