分析了豫中烟区8个主要植烟县的土壤物理性状和养分特性,并对其相关性进行了研究.结果表明,豫中植烟土壤的物理性状较稳定,粒级以粉粒为主,沙粒次之,黏粒含量最低,其中粉粒以粗粉粒＞细粉粒＞中粉粒;物理性黏粒含量分布为30％～60％,属于中壤土和重壤土;容重分布范围为1.05～1.17 g·cm-3,均适宜烟株根系生长;总孔隙度分布范围39.40％～70.15％,2.28％的偏低,40.57％偏高,其中禹州、郏县和叶县均值偏高.养分特性以pH值中性偏碱,有机质、全氮、碱解氮和氯离子含量适宜,速效磷和速效钾含量最适宜,但是除pH值为弱变异外,有机质、全氮、全磷、全钾和碱解氮为中等变异,速效磷、速效钾和氯离子含量为强变异.相关性分析表明,土壤pH值与粗沙粒、黏粒、容重呈极显著正相关,与细沙粒和粉粒呈极显著负相关;有机质、全氮、全磷、速效钾与黏粒呈极显著正相关,而与沙粒、粉粒呈极显著负相关;全钾、碱解氮与孔隙度呈极显著正相关,与粗沙粒、容重呈极显著负相关;速效磷与粉粒呈显著正相关,与粗沙粒呈极显著负相关;氯离子仅与粒级0.5～0.1 mm呈显著正相关.

Spatial distribution of soil available micro-elements in tobacco planting fields was studied to provide theoretical basis for precision application of micro-fertilizers using geostatistics and GIS technique on small scale.Results showed that soil available microelements(Fe,Mn,Cu,and Zn) had medium variability with coefficient of variation from 22.0% to 48.4%.The semivariograms of available microelements could be fitted well with the spherical models.Kriging method was used to generate spatial distribution maps of soil available microelements,which indicated the content of soil available Cu and Mn had medium to high levels,while the 78% and 43% area of the whole study region were lack of soil available Fe and Zn,respectively.