免耕补播对新疆伊犁河流域草地生态化学计量特征的影响OA

No-tillage reseeding is one of the important measures for improving degraded grasslands.This study focused on three types of temperate grasslands in the Ili River Basin of Xinjiang,setting up no-tillage reseeding and free grazing treatments.The aim was to investigate the effects of short-term reseeding treatment on plant communities,soil physicochemical properties,and plant-soil ecological stoichiometric characteristics,as well as to reveal the ecosystem's internal stability response mechanisms.The results showed that no-tillage reseed-ing significantly increased aboveground biomass and community coverage,with community diversity signifi-cantly enhanced only in the temperate meadow steppe.The effects of no-tillage reseeding on soil physical prop-erties varied across the grassland types.Plant carbon content significantly increased across all three grassland types,while nitrogen content significantly decreased,and the nitrogen-to-phosphorus ratio of vegetation signifi-cantly decreased.Soil organic carbon and total nitrogen both significantly increased,while total phosphorus showed no significant change.The soil carbon-to-phosphorus ratio in the temperate desert steppe and temper-ate grassland significantly increased,and nitrogen-to-phosphrous ratio increased significantly only in temperate desert steppe.Plant communities of all three grassland types exhibited"absolutely steady state"characteristics.In conclusion,no-tillage reseeding significantly enhanced grassland productivity by promoting community resto-ration and regulating soil nutrients.The responses of different grassland types to no-tillage reseeding vary,pro-viding scientific evidence and theoretical support for the"differentiated zoning management"of grassland eco-logical restoration in arid and semi-arid regions.