Analysis on the Driving Force of Farming Non-Point Source Pollution in the Xingyun Lake Basin of Yunan Province

Farming non-point source pollution is one of the main sources of water pollution in lakes. However, little research has been done on the driving force of farming non-point source pollution. In order to study the driving forces of nonpoint source pollution in farming industry in Xingyun Lake Basin, the amount of fertilizer loss from farming industry in 2005, 2010 and 2015 was calculated by the loss coefficient method, and the influencing factors was analyzed by multiple linear regression. The results show that:(1) The proportion of agricultural population in the total population, the proportion of cultivated land, the farming area of economic crops and fruit trees, the ratio of sowing area of economic crops and grain crops, and the output value of the first industry are positively correlated with the amount of chemical fertilizer loss. The sown area of grain crops, non-agricultural income per capita, and environmental protection investment index are all negatively related to the amount of chemical fertilizer loss. (2) The farming area of economic crops and fruit trees, the ratio of sowing area of economic crops to grain crops and the amount of chemical fertilizer loss are the highest, which are all greater than 0. 9. Therefore, the decisive factor of planting non-point source pollution is planting structure in Xingyun Lake Basin.