黑龙江省土壤容重传递函数研究

Pedotransfer Functions for Estimating Soil Bulk Density in Heilongjiang Province

基于黑龙江省土壤系统分类数据库,对已发表的3种土壤容重传递函数在黑龙江省的预测精度与适用性进行评估.研究结果表明:已发表的3种容重传递函数在黑龙江省的预测精度较好,为此,基于该区数据库重新拟合模型或对已有模型的参数校正可以提高该区土壤容重的预测精度.与多项式模型1’相比,非线性模型2’与多项式简化模型3’在预测土壤容重时只需要一个参数,而预测精度并没有明显降低,因此适用范围更大.研究结果同时表明在研究与应用土壤容重传递函数时要考虑土壤的地域性.

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.