Spatial variability and influencing factors of soil available microelements in the source region of the Dan-jiang River
Geostatistics,correction analysis,regression analysis and GIS technology were used to clarify the spatial variations of soil available microelements(Fe,Mn,Cu,Zn and B)and to explore their influencing factors in dif-ferent geological formation units in the source region of the Danjiang River of the Middle Route of China's South-to-North Water Transfer Project.The results showed that the average contents of soil available Fe,Mn,Cu,Zn and B were 45.51,42.39,1.26,3.34 and 0.39 mg·kg-1,respectively.Among them,the contents of available Fe,Mn and Zn were above the rich levels,available Cu reached the medium level,while available B was at the poor level.According to the results of semi-variance analysis,soil available Zn exhibited strong spatial variability(CV=130.4％)in different geological formations,influenced by structural factors.Soil available Mn,B,Fe and Cu all showed moderate spatial variabilities(CV=52.8％-94.2％),which were mainly affected by both structural and random factors.Soil available N,P,K and organic matter contents were positively correlated with soil available mi-croelements,while soil pH was negatively correlated with available Mn and Fe,but not significantly correlated with available B,Cu and Zn.Generally,the geological formation has a strong explanatory power on the spatial variation of soil available microelements,which provides a reliable reference for the utilization and management of land resources in different regions based on geological formations.
geological formationsoil available microelementspatial variabilityinfluencing factorsource region of the Danjiang River
万方数据
维普
