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Inner Mongolia Agricultural University (2003)

Basic Studies on Desertification Process and Vegetation Restoration of Otindag Sandy Land—A Case of Zhenglan Banner

Li Hong Li

Titre : Basic Studies on Desertification Process and Vegetation Restoration of Otindag Sandy Land—A Case of Zhenglan Banner

Auteur : Li Hong Li

Grade : Doctoral Dissertation 2003

Université : Inner Mongolia Agricultural University

Résumé
Vegetation recovery is key to desertification process of of this paper Hunshandake sandy, vegetation succession, natural plant communities in soil water dynamics, water features, adaptability and stability, vegetation recovery mechanisms to combat land desertification expansion and mitigation of dust storms endanger explore ways from the the SPAC system of sustainable development to discuss water use mechanism with the dynamic changes in plant community and community relationship. The study showed that : cultivated human too, overgrazing, over-interference firewood collection Hunshandake sandy desertification expansion and the main cause of degradation of vegetation, protection of natural vegetation, the establishment of artificial vegetation Desertification Reversion and promote vegetation recovery process . Vegetation progressive succession for the reversal of the process of desertification, plant soil seed bank of the study area and its germination mechanism may provide for the recovery of natural vegetation. The study area range of different plant species root distribution, morphological and anatomical structure and water physiological indicators reflect different plants to different mechanisms of water use and sandy habitats adaptive mechanism. Different spatial and temporal patterns of different plant communities of the study area, soil moisture, soil water content of the spatial distribution of low-value layer of surface soil moisture can be divided from top to bottom, a relatively stable layer of volatility layer of soil moisture and soil moisture ; season soil moisture The changes can be divided into the soil moisture stabilization period (May to June), soil moisture depletion period (June to September) and soil moisture slow recovery period (September to October), soil wet and dry seasons change and atmospheric precipitation in wet and dry season not consistent ; dynamic changes of soil moisture by vegetation and atmospheric precipitation. Main plant species transpiration rate diurnal and seasonal changes significantly, transpiration rate and environmental factors significantly associated linear ; study of plant communities evapotranspiration plant species ; spatial distribution of soil moisture in the community soil moisture deficit violent change layer, the roots are densely distributed layer coincides closely related to seasonal dynamics of plant phenophase. Various plant communities and soil water deficit can be divided into severe, moderate and mild deficit in three types, and its seasonal changes ; adaptive strategies of plant species and communities to soil water deficit. The Saudi natural recovery of vegetation suitable lots and plant communities ; dune vegetation succession laws and seed breeding mechanism proposed discussion on soil water resources capacity and community stability, the community water stability mechanism, based on high water consumption plants low water plants spatial distribution pattern of response mechanism of water resources, proposed Saudi artificial vegetation should take \Nutritional space proposed the theory of artificial vegetation restoration planting density.

Mots clés : Hunshandak Sandland Vegetation restoration Desertification process Sand Plant Community Soil moisture dynamics Water balance Transpiration rate Root

Présentation (Dissertationtopic)

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