The impact of enclosure on the vegetation and soil characteristics of alpine grassland in the upper reaches of the Yellow River
This paper investigates the effects of enclosure on vegetation and soil characteristics in alpine steppes in the upperYellow River.Taking the alpine degraded steppes in Shiqu County,Tibetan Autonomous Prefecture of Ganzi,Sichuan Province as the study ob-ject,this paper investigated the dynamic variations of physical and chemical properties of vegetation and soil across the steppes under enclo-sure conditions through field investigation and sample analysis.The findings elucidate that following the implementation of enclosure meas-ures,the ecological restoration efficiency of the steppes in closure sites against grazing surpassed that of comparison sites,attaining its zen-ith in the third year.Specifically,the increase in vegetation height was 92.52%,the coverage increased by 10.97%,and the productivity increased by101.02%.Soil bulk density significantly decreased to6.97%,organic carbon,total nitrogen,and total phosphorus content significantly increased by69.48%,96.92%,and66.99%,respectively.After the lapse of a triumvirate of years subsequent to the im-plementation of enclosure measures,the N element assumed an instrumental position in facilitating the restoration of soil integrity and the re-naissance of vegetation proliferation.The study conclusions have certain guiding significance for ecological restoration measures and guiding farmers and herdsmen production in alpine degraded steppes.
alpine grasslandenclosurevegetation communitiesphysical and chemical characteristics of soil
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