Effects of different sand-fixation measures on vegetation and soil characteristics of high and flat mobile dunes
Desertification constitutes the primary catalyst for land degradation in the Horqin Sandy Land.Imple-menting scientifically sound measures to mitigate sand erosion can effectively curb wind-borne sand encroach-ment,thereby facilitating the restoration and rehabilitation of the vegetation-soil system.This study,focusing on the high and flat mobile dunes in the Horqin Sandy Land,investigates the vegetation community characteristics and soil physical and chemical properties under three sand-fixation measures,namely natural restoration,Artemisia halodendron planting,and grass checkerboard sand barriers.The findings aim to provide scientific guidance for selecting appropriate sand-fixation measures for this specific type of dunes.The results showed that:(1)Under different sand-fixation measures,the plant species richness of flat sand dunes was grass checkerboard(20 species)＞planting A.halodendron(18 species)＞natural restoration(15 species);the plant species rich-ness of high mobile dunes was grass checkerboard(14 species)＞plantingA.halodendron(8 species)＞natural restoration(5 species).(2)There was no significant difference in soil physical and chemical properties between the high and flat moblie dunes.Setting grass checkerboard sand barriers significantly increased soil organic car-bon and total nitrogen contents(P＜0.05);with the extension of restoration years,soil nutrient content increased significantly(P＜0.05).(3)There was a significant positive correlation between soil organic carbon and total ni-trogen contents and species richness in the high and flat sand dunes(P＜0.05).Establishing straw checkerboard sand barriers could significantly improve the species richness of plant communities and increase soil nutrients to improve soil quality,which was one of the most beneficial measures for the ecological restoration of mobile dunes in the study area.Ecological restoration is a relatively long process.With the extension of sand fixation years,natural restoration,planting A.halodendron and establishing straw checkerboard sand barriers were all beneficial to the ecological restoration of mobile dunes in Horqin Sandy Land.
sand fixation measuresmobile dunesplant community characteristicssoil physical and chemi-cal properties
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