Effect Of Agriculture And Tourism Activities On ShaHu Lake Water Quality

The five sample sites of Shahu Lake were surveyed in March 2009 to December 2014.The principal component analysis method was used to analyze the main environmental factors affecting on the Shahu lake water quality. The method of grey relational was used to comprehensively evaluation water quality conditions of Shahu lakes. Based on the investigation and analysis of agricultural activities and tourism activities, the effect of agricultural activities and tourism activities on the water quality were studied in Shahu lake. The results could provide scientific basis and basic data for the Shahu lake ecological environment protection. The results of this study are as follows.1. The main factor affecting the water environment were chlorophyll, ammonia nitrogen, total nitrogen, dissolved oxygen, fluoride and 5th biochemical oxygen demand (cod) in Shahu lake from 2009 to 2014.The water quality comprehensive evaluation rusult of Shahu lake water quality was Ⅴ class in 2013 and that were Ⅳ class in other years.The Grey correlation method rusult of Shahu lake water quality was Ⅴ class in 2010 and that were Ⅳ class in other years.2.The agricultural irrigation water and the growth of agricultural pollution were significant positive correlation with the water quality comprehensive pollution index of Shahu lake. The major agricultural factors affecting on the water quality comprehensive pollution index in Shahu Lake were the agricultural irrigation return water, rural life pollution, agricultural irrigation farming, livestock and poultry breeding pollution.3. With the growth of tourist numbers,the water conductivity increased gradually,the transparency reduced gradually and the water quality comprehensive pollution index increased gradually in Shahu lake year by year. The water quality of Shahu lake was the basic state of qualified in 2011 and 2012,and that was pollution state in 2013 and 2014. The major tourism factors affecting on the water quality comprehensive pollution index in Shahu Lake were the catering accommodation total water use, the ship reception, catering accommodation reception of the total number, the total number of tourism, gasoline and diesel ship reception.The effect of tourism activities on the water environment quality was obvious in Shahu lake.