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Inner Mongolia Agricultural University (2022)

Effects of Vegetation Characteristics of Desert Steppe on Aeolian Soil under Different Stocking Rates

倪芳芳

Titre : Effects of Vegetation Characteristics of Desert Steppe on Aeolian Soil under Different Stocking Rates

Auteur : 倪芳芳

Grade : Master 2022

Université : Inner Mongolia Agricultural University

Résumé
The objective of this research was to study the effect of vegetation community characteristics on soil wind erosion under different stocking rates,based on the experimental platform for wind erosion monitoring in 2013 in Stipa breviflora desert steppe area.The grazing experiment adopted a completely randomized block design,with a total of 4 levels of stocking rate and 3 repetitions,namely control(CK),light grazing(LG),moderate grazing(MG)and heavy grazing(HG).Four sets of sand collecting devices(BSNE)with different heights(including one set of sand collecting box with height of 0,0.1,0.3,0.5,0.7,1.0,1.2m,in addition,three sets of sand collecting box with height of 0,0.1,0.3,1.0 m)were used in each grazing plot to collect wind erosion materials in mid-April and mid-October every year,and then weigh and calculate the dust flux,and the total C and total N content were tested by Vario MACRO CUBE element analyzer.Monthly survey of plant community characteristics(height,coverage,Standing biomass,and litter weight)was carried out from May to October.Base on the data analysis,the results were as follows :(1)The fitting equation between dust flux and height under different stocking rates in non-growing season and growing season conformed to Q=a Hb+c,the percentage of dust flux at 0.1 m height was the highest.Dust flux of different height in growing season were higher than non-growing season under different stocking rates.(2)The fitting equation between total C,N and height in non-growing season and growing season conformed to y=ax 2+bx+c,total C of aeolian soil at the same height was ten times than total N content.Total C content of aeolian soil of non-growing season were higher than growing season in different heights under different stocking rates.Grazing reduced the total C content and the total N content of aeolian soil.(3)The plant community characteristics have the function of preventing wind erosion under different stocking rates in different seasons.With the stocking rate increasing,plant community height,vegetation cover,standing biomass and litter weight were gradually reduced.The effects of HG,MG,LG,and CK on dust flux decreased in turn.Plant community standing biomass and litter weight played a major role in reducing wind erosion in CK and LG treatment.Plant community height and vegetation cover has a great influence on reducing wind erosion in MG and HG treatment.

Mots clés : Desert steppe ;Stocking rate ;Plant community characteristics ;Wind erosion ;Dust flux ;

Présentation (CNKI)

Page publiée le 14 mai 2023