摘要
Abstract
Reseeding is an important measure for restoring the structure and function of degraded alpine grasslands,where plant species selection and reseeding strategies are critical factors determining the success of grassland restoration.This study focused on severely degraded alpine grasslands in Gannan and selected four native plant species.A reseeding experiment with different treatments(control,single-species reseeding,and mixed-species reseeding)was conducted to investigate the effects of reseeding strategies on plant community characteristics and soil physicochemical properties.The results showed that:(1)Both single-species and mixed-species reseeding significantly increased aboveground biomass,cover,height,and the proportion of high-quality forage in the plant community.Furthermore,these enhancement effects became stronger with an increasing number of reseeded plant species.(2)Mixed-species reseeding significantly improved species richness and the Shannon diversity index of the plant community,whereas single-species reseeding had no significant effect.(3)Mixed-species reseeding significantly increased soil total nitrogen,total phosphorus,total potassium,organic matter,ammonium nitrogen,and nitrate nitrogen content,but significantly decreased available potassium and available phosphorus content.In contrast,single-species reseeding only significantly increased soil organic matter and ammonium ni-trogen content,with no significant effects on other soil physi-cochemical properties.In conclusion,multi-species reseeding is an effective approach for the rapid restoration of ecosystem functions in degraded alpine grasslands.This study provides theoretical support and practical guidance for the ecological restoration of degraded alpine grasslands in Gannan.关键词
补播/高寒草地/草地修复/植物群落特征/土壤理化性质Key words
reseeding/alpine grassland/grassland restora-tion/plant community characteristics/soil physicochemical prop-erties分类
农业科技
