Abstract:
Taking the typical land use peach(Prunus persica) orchard and corn(Zea mays L.) field on brown soil from Yimeng mountainous area as a case study, the change characteristics of soil water repellency(SWR) before and after a rainfall event and its response to the soil physicochemical properties, such as soil moisture, soil organic content and soil texture, were explored.Further more, the SWR were analyzed using the spatial autocorrelation analysis and bivariate spatial correlation with the soil moisture, soil organic content and soil sand, silt, clay content. Results showed: (1) The actual SWR of both two land use types were strong and that of corn field were stronger. After the rainfall, the SWR of peach orchard decreased significantly while that of corn field was still strong water repellent. (2) There were obvious differences in spatial distribution characteristics of SWR between the two patches, that is, SWR of peach orchard presented spatial autocorrelation and that of corn field did random distribution.(3) Results of spatial correlation analysis showed that neither the SWR of two land use types has obvious correlation with soil organic content. The soil moisture presented negative spatial correlation with SWR of peach orchard and positive with that of corn field, both of them presented not obvious before the rainfall and significant after the rainfall. The soil sand and silt content presented significant spatial correlation with SWR of peach orchard both before and after the rainfall, and the degree of spatial correlation decreased after the rainfall. The soil clay content has no obvious effect on SWR of peach orchard. All the soil sand and silt and clay content presented significant spatial correlation with SWR of corn field before the rainfall and showed opposite correlation after the rainfall, with only the clay reach to significant correlation.(4) The spatial difference of the soil water repellency between peach orchard and corn field was mainly determined by soil texture and land use types, and the soil water content was the main factor that caused the different responses of SWR to the soil physicochemical properties of the two land use types before and after the rainfall.
