The Dynamic Study Of Vegetation And Water Body Of Qingtu Lake Based On High Resolution Satellite Image

The high resolution remote sensing data from 2008, 2010, 2011, 2012, 2013, 2014 combining with field survey data were statistically analyzed and compared to study area and The area of water surface, the plant species, plant community diversity and the main research areas of the plant species, plant communities, and the area of Phragmites australi,Nitraria tangutorum community before and after the formation of the artificial lake.The main conclusions are in the following:(1) The results showed that: the formation water additive effect was formed with for consecutive five consecutive years, increasing year after year, the ground water level continued to rise 70 cm by 5 years, Phragmites australis and Nitraria tangutorum communities area after water was increased and overall decreasing trend, and leads to an increase of 8.43 times of reeds and Nitraria tangutorum reduced about 0.68. With the formation and change of of artificial lake.The relative frequency of Phragmites australis in the continuous water delivery increased and the relative frequency of the Nitraria tangutorum reduced year by year, and the Form.Phragmites australis embedded in a large area and surrounding theadjacent water and the portion of Form.Nitraria tangutorum disappeared. From the 50 m wide of Lake Bank by a continuous distribution to points.The water delivery to Qingtu Lake promoted wetland plants growing, and resulting in degradation of desert plant.(2) It was applied diversity index to analyze plant diversity of Qintu shores and its relationships of water formation. The results showed that: the number of plant species reduced in 200 m range from the surface, where 0 m from the surface reducedthe maximum plant species and minimal changes at 100 m. Shannon-Weiner, Pielou indexand Simpson indexhad similar trend, Shannon-Weiner reduced, Pielou index and Simpson index increased.(3) It is used ecology and canonical correspondence analysis method, the relations of plant community structure and its environment of Qingtu lakeshore were analyzed. The results showed that during the process of artificial lake formation, plant species distribution gradually dispersed and differentiated. The number of herbaceous plants represented by Phragmites australis from the water body of the range 0-50 m with 3.5m level of underground water was increasing sharply, and cluster. The Trend on the distribution of plant species shown cluster to uniform at the water area of the range 50-200 m. The change of plant life proportional appeared with the horizontal distance from near to far with the lake. The spatial structure of plant community was constructed by transformation of plant species.