Studies of Soil Physical Properties and Community Characteristics of Different Abandoned Lands in the Minqin Oasis,Downstream of the Shiyang River
[Objective] The aim was to explore physical properties and community characteristics of abandoned lands in different years in Minqin Oasis,downstream of the Shiyang River.[Method] The evolution of environment and plant community characteristics in different abandoned lands were analyzed after abandonment for 1,2,3,4,5,8,15,24 and 31 years,and the plant community characteristics,water content,bulk density,porosity and mechanical composition of soil in the different abandoned lands were also researched in the Minqin Oasis,downstream of the Shiyang River.[Result] Plant of 32 species spread over 14 family live through fifty years appeared in abandoned lands in the study area.Shrubs was 6 species,herbs was 26 species among them,which were 18.75％,81.25％ respectively.The goosefoot family (6 species),the composite family(4 species),the grass family(4 species),caltrop family(3 species) were 53.13％ among them.Within the range of 0-40 cm of different abandoned Land,the soil moisture content showed a trend of first increase and then decrease with the increase of soil depth changes in soil bulk density and porosity of less obvious.In the range of 0-40 cm soil depth,the largest proportion of fine sand,followed by silt and clay and the smallest proportion of coarse sand in every plot,but the proportion of the each silt size varies little with the years abandoned.[Conclusion] The research provides references for vegetation reconstruction and eco-environment construction in abandoned lands in downstream of Shiyang River.
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