海拔梯度下高寒草甸土壤有机碳、全氮含量的影响因素研究OA

[Objective]This study aims to investigate the characteristics and influencing factors of soil organic carbon and total nitrogen contents in alpine meadow across an altitudinal gradient in Golog Tibetan Autonomous Pre-fecture,Qinghai Province.[Method]Using methods such as stepwise regression and path analysis,the surface soil(0～20 cm)of alpine meadows at an altitude of 3,300～4,500 m in Golog Tibetan Autonomous Prefecture was stud-ied.The influencing factors were analyzed to provide an important reference for estimating carbon and nitrogen stor-age on the Qinghai-Tibet Plateau.[Result]The results showed that the soil organic carbon and total nitrogen con-tent in the 0～20 cm soil layer of the alpine meadows in the study area ranged from 39.79～72.51 g/kg and 3.65～6.48 g/kg,with average values of 62.3 g/kg and 5.7 g/kg,respectively.Both exhibited a fluctuating trend with in-creasing altitude.Stepwise regression analysis established multiple regression equations between total nitrogen con-tent,soil organic carbon content,and other physicochemical factors:SOC=27.97+10.12TN-3.62pH+0.57AP+0.01AK and TN=-4.09+0.07SOC+0.01AN+0.47pH,Indicating that interactions among soil physi-cochemical properties jointly influenced soil carbon and nitrogen content.Soil organic carbon and total nitrogen con-tent were significant direct influencing factors for each other.Soil pH,available potassium,and available phosphorus content indirectly affected soil organic carbon through other factors,while soil pH and alkaline hydrolysable nitrogen content indirectly affected soil total nitrogen content through other factors.[Conclusion]The soil in the study area are relatively fertile,with high levels of organic matter and total nitrogen content,providing sufficient nutrients for vegeta-tion growth.Increasing available soil nutrients and rationally regulating pH are conducive to the accumulation of soil organic carbon and total nitrogen content.