【摘要】 以河北省邯郸市曲周县为研究区域,采用地统计学与地理信息系统相结合的方法,对曲周县农田土壤有效微量元素铁(Fe)、锰(Mn)、铜(Cu)、锌(Zn)含量的空间变异特征及其主要影响因素进行了初步研究和探讨。结果表明:土壤有效Fe、Mn含量的最优理论模型为指数型(R2为0.887和0.553),有效Cu含量为球状模型(R2为0.988),有效Zn含量为高斯模型(R2为0.977)。土壤有效微量元素含量的空间变异程度和空间相关性由大到小依次为:Zn> Cu> Mn> Fe,Fe> Zn> Mn> Cu。从空间分布来看,土壤有效Fe、Mn、Zn含量主要处于低水平,并且土壤有效Fe、Mn、Cu含量以片状分布为主,土壤有效Zn含量呈现由西向东逐渐递减的趋势。土壤有效Fe、Mn、Cu、Zn含量与土壤有机质含量均呈极显著正相关,与土壤pH间没有显著的相关,而土壤有效Cu含量则与土壤pH间存在显著正相关。总体而言,曲周农田土壤有效Fe,Mn,Zn含量相对较低,而有效铜含量相对较高。如果种植对铁锌敏感而且需求量相对较高的作物,应该考虑Fe、Zn肥的施用。更多还原

【Abstract】 Based on the combination of GIS and geo-statistics analysis methods, the spatial distribution characteristics of soil available micronutrients including Fe, Mn, Cu, and Zn in Quzhou were analyzed. The theoretical semi-variogram models of soil available Fe and Mn concentrations matched with Exponential model(R2= 0.887 and0.553, respectively). The best fitting models of soil available Cu and Zn concentrations were spherical model(R2=0.988) and Gaussisn model(R2= 0.977), respectively. The degree of spatial variation and spatial correlation of soil available micronutrients were in the order of Zn > Cu > Mn > Fe, and Fe > Zn > Mn > Cu. The concentrations of soil available Fe, Mn and Zn were at the relatively lower levels and spatially distributed mainly in patchy. And the concentration of soil available Zn was gradually decreased from west to east of Quzhou. The concentrations of soil available Fe, Mn, Cu and Zn were positively correlated with soil organic matter, while the concentration of soil available Cu was correlated with soil pH. In summary, the concentrations of soil available Fe, Mn and Zn in Quzhou are at relatively lower levels, while the concentration of soil available Cu is relatively higher. If the crops are sensitive to Fe and Zn and have relatively higher demands for them, the application of Fe and Zn fertilizers should be considered.更多还原