Analysis on Environmental Pollution in Drinking Headwater Area in Bijie Karst Mountainous Region and Its Protection

It selects nine environment factors,including domestic sewage discharge as analysis variables based on the evaluation of water quality of 13 drinking headwater areas,such as Daotianhe Reservoir in Bijie region.It summarizes the environment affecting factors of the area into four main factors of number of population,intensity of agricultural land use,agricultural chemical pollution and natural condition of a river basin through main factors analysis.Its square deviation cumulative contribution ratio reaches to 86.093%.It divides the environment of headwater area into three categories of domestic sewage pollution,soil and water loss pollution and pesticide and fertilizer pollution and puts forward corresponding measures for environmental protection according to different intensity of water pollution effected by each main factor and status of polluted water.