EFFECT OF EXPLOITATION AND CONSTRUCTION OF JINGTAI IRRIGATION AREA ON LOCAL ECO ENVIRONMENT
景电灌区开发建设对区域生态环境的影响

This paper analyses the changes of eco enviroment in the new irrigated area of Jingtai County since its construction.The results show that,a new vegetation landscape was formed in combination of a man made vegetation and improved natural vegetation.That increased the irrgation area and raised the cover rate of vegetation,the evaporation capacity dropped considerably meanwhile,the day number of strong wind,the day number of dust and sand storm,and the annually average speed of winds were decreased.And the precipitation,air temperature and humidity changed to certain degree.The areas with stronger activities and longer time of exploitation generally and higher cover rate of vegetation,the better effect of transformation and the more improved fertility in soil.However,it was found that irrigation could cause secondary salinization in the area of bad drainage.