Pedotransfer Functions for Estimating Soil Bulk Density in Heilongjiang Province

Soil bulk density(BD), which can be measured by several labor-intensive procedures, is frequently missing from soil databases. However, it is an essential parameter in many calculations and models, and pedotransfer functions(PTFs)can be developed to estimate it. In this article, the predictive accuracy of 3 published PTFs was evaluated using soil datasets from Heilongjiang Province. Additionally, exploratory stepwise regression models were proposed and validated. The results show that the published models performed well when used for soil bulk density evaluation. The results have also shown that the exploratory models and the parameters tailored to the current data improved model performance and regionality must be considered in the published PTFs application.