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.