Spatial heterogeneities of total carbon(C),total nitrogen(N),total phosphorus(P),and total potassium(K) contents in black thin-layer soil in Shuangcheng City,Heilongjiang Province were analyzed by geostatistical method.Results showed that all of them had the significant spatial heterogeneity.The spatial distribution of total C was affected by the depth of dark soil and it had high spatial similarity with total P.Total K had the least spatial heterogeneity and its variability is little in entire area except in the central and southwest areas.Total C was correlated positively with total N and total P,and total N,negatively with total P.However,total K was correlated negatively with total C,total N,and total P.Total C,total N,and total K were greatly affected by soil structure factors and their effects accounted to 86.8%,85.4%,and 81.8%,respectively.Total P was affected equally by structure and random factors.