Study on the Change of Soil Nutrient Content in Pinus sylvestris var.mongolica Plantations in Northern Liaoning Province
In order to understand the change of soil nutrient content in Pinus sylvestris var.mongolica plantations in northern Liaoning Province,the soil of Pinus sylvestris var.mongolica plantations in Fujia Mechanical Forest Farm of Changtu County in northern Liaoning Province was taken as the object to investigate and research the soil nutrient status of the stands with different forest ages.The results showed as follows:there were significant differ-ences in the nutrient content changes of soil carbon,nitrogen and phosphorus among Pinus sylvestris var.mongolica plantations with different forest ages,and the nutrient content of surface soil(0-10 cm)was generally higher than that of subsurface soil(＞10-20 cm).With the increasing of age of Pinus sylvestris var.mongolica,soil organic carbon and total nitrogen increased significantly,total phosphorus did not change significantly,alkali-hydrolyzed ni-trogen increased first and then decreased,available phosphorus content continued to decrease,and there was no sig-nificant change in soil C/N.The soil organic carbon content in surface soil(0-10 cm)was positively correlated with total nitrogen content and negatively correlated with alkali-total nitrogen content,and negatively correlated with alkali-hydrolyzable nitrogen;soil total nitrogen content was negatively correlated with alkali-hydrolyzable nitrogen,total phosphorus and available phosphorus content.The contents of soil carbon,nitrogen and phosphorus in the stands with different forest ages were enriched in the surface layer.With the increase of forest age,the return of soil carbon and nitrogen nutrients increased,so that the soil could be effectively supplemented,but the soil phosphorus a-vailability was low,which was one of the factors limiting the effective transformation of soil nitrogen.
万方数据
维普
