中国农业科学2025，Vol.58Issue(9)：1791-1803,13.DOI:10.3864/j.issn.0578-1752.2025.09.009
黑龙江省嫩江市土壤容重空间分布格局及传递函数构建
Spatial Distribution Pattern and Transfer Function Construction of Soil Bulk Density in Nenjiang City,Heilongjiang Province
摘要
Abstract
[Objective]Given the unclear degree of"hardening"of cultivated soil and its spatial distribution in the typical black soil region of Northeast China,this study took Nenjiang City,Heilongjiang Province for example,the spatial distribution pattern of soil bulk density were predicted and analyzed,and the soil bulk density transfer function based on factors such as organic matter content and compaction was established.[Method]Pearson correlation analysis and principal component analysis were used to evaluate the importance of various factors on soil bulk density,the random forest model was employed for predictive mapping,and multiple soil bulk density transfer functions were constructed and compared for accuracy.[Result]Soil bulk density was significantly negatively correlated with water content and organic matter content,and was affected by multiple factors such as clay,sand,pH,average annual temperature,and average annual precipitation,but the impact of topography was relatively small.Forecast mapping revealed that the soil bulk density showed a gradually increasing trend from the northeast(1.08-1.17 g·cm-3)to the southwest(1.30-1.40 g·cm-3)in Nenjiang City,and the soil bulk density in the subsoil was higher than that in the topsoil.In addition,soil bulk density and soil compaction increased with soil depth,but the soil bulk density changed slowly(1.20-1.44 g·cm-3),while the soil compaction increased rapidly mainly in the topsoil(0-20 cm)(the change amplitude was about 300 kPa).Besides,the binomial model and support vector machine had higher R2 values in the fitting of organic matter-bulk density and compaction-bulk density,respectively,and had better fitting effects.In the subsoil,the prediction accuracy of the soil bulk density transfer function constructed by compaction(R2=0.55,RMSE=0.1)was higher than that of the model constructed by soil organic matter(R2=0.43,RMSE=0.12).[Conclusion]The soil bulk density in Nenjiang City showed a distribution trend of being low in the northeast and high in the southwest,and was affected by multiple factors such as soil properties,climate and topography.In addition,the compaction transfer function could be used as a rapid diagnostic method for changes in soil bulk density and the degree of"hardening"of the black soil region in Northeast China.关键词
东北黑土/土壤容重/土壤紧实度/土壤有机质/空间分布/传递函数/随机森林模型Key words
Northeast black soil/soil bulk density/soil compaction/soil organic matter/spatial distribution/transfer function/random forest model引用本文复制引用
王冰洁,汪景宽,秦诗涵,李德成,胡文友,姜军,迟凤琴,张超,张久明,徐英德..黑龙江省嫩江市土壤容重空间分布格局及传递函数构建[J].中国农业科学,2025,58(9):1791-1803,13.基金项目
国家重点研发计划(2021YFD1500202)、国家自然科学基金(42207383) （2021YFD1500202）
