Degradation of the Eco-Environmental System in Alpine Meadow on the Tibetan Plateau

The grassland environment in the cold regions of the Tibetan Plateau is an important parts of the tableland environment,because of the influence of the natural environment changes and the disturbances from the human activities;the meadow environment of the tableland is in great degradation now.In a representative area in the degraded meadow,the changes of the soil moisture in the grassland,the edaphic structures and the status of the vegetations are studied.It is revealed that after the grassland degradation,the courses of the soil moisture have changed a lot,and the more vegetation degenerates,the more soil moisture changes,and the process of the water entering into soil also becomes quick.Then, the succession of communities become more distinct,the preponderant plant degenerates greatly,and the plants become small.The soil erosion becomes heavy than ever and in the arid regions,desertification becomes more serious.The natural disasters,including the pests from rats and insects,will be frequent.