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Beijing Forestry University (2013)

Analysis of Eco-efficiency on 4Kinds of Typical Vegetation Restoration Mode in Mu Us Sandy Land

安云;

Titre : Analysis of Eco-efficiency on 4Kinds of Typical Vegetation Restoration Mode in Mu Us Sandy Land

Auteur : 安云;

Grade : Master’s Theses 2013

Université : Beijing Forestry University

Résumé
Desertification is one of the world’s most serious environmental problems. Vegetation restoration by artificial measures is a effective way to combat desertification in the sandy land. In this study, through a field survey in Yanchi county, Ningxia and Wushen banner, Inner Mongolia,4typical vegetation restoration modes were summarized. Then their eco-efficiency was analyzed, including vegetation-efficiency, soil improvement-efficiency, wind-efficiency, climatic factors and community stability.(1) Shrub-afforestation mode. After afforesting, the vegetation coverage was increased from5%to65%, Salix was in good growth conditions, ground vegetation biomass and species diversity were increased. The porosity condition and nutrient content of soil were improved. Underlying surface roughness of woodland was raised, and wind effect was obvious. Moreover, afforestation made the surface temperature and air temperature lower and the air humidity higher. It played the role of regulate climatic factors. The M.Godron stability index of woodland was higher than mobile dune. But the woodland was not stable enough because of the unitary species structure.(2) Enclosure mode. After enclosure, vegetation coverage and ground vegetation biomass were improved, community structure varied from simple to complicated. The soil bulk density of closure area decreased while nutrient content increased significantly. Underlying surface roughness was improved and the wind effect was good. The surface temperature and air temperature of closure area were lower than non-closure area while the air humidity was higher. The condition was good for the growth of vegetation. Enclosure could improve the M.Godron stability, but the effect was not obvious. The enclosure should be optimized.(3) Shrub-afforestation for wind and sand with two lines and a region mode. After afforestation, ground vegetation biomass and vegetation recovery were increased obviously. The community became more complicated and homogeneous. The permeability and drainage conditions were better, and the nutrient content was increased. The underlying surface roughness was raised. The wind effect of50cm was higher than200cm. And the M.Godron stability was improved.(4) Aerial-afforestation mode. After afforestation, the vegetation recovery was increased, the community structure became more complicated and the stability was better. The habitat got better, the physical and chemical properties of soil were improved, the speed of wind was decreased. The mode had good ecological benefits.According to the results, the suggestions were given out for the vegetation restoration mode in order to provide a theoretical basis and technology practice for the vegetation recovery and desertification control in sandy land.

Mots clés : Mu Us sandy land; Vegetation restoration mode; Eco-efficiency;

Présentation (CNKI)

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