Abstract: With the help of remote sensing, this paper analyzed the land use change and related ecological environment in Wushui River Basin of Hunan Province. The results indicated that in 1986-2000, the forestland of this basin increased by 12.69%, uplands with a slope larger than 25° reduced by 1.13×10⁴ hm², and cultivated land and lawn increased by 16.31% and 98.10%, respectively. The annual increasing rate of water and soil erosion was 1.79%, with a moderately eroded area increased by 77.75%. Industrial wastewater discharge raised 2.5% annually, and industrial waste gas emission increased by 1.37 times. In light of these problems, more attention should be paid to the bush land protection and forest vegetation restoration, the control of water and air pollution with focus on the renovation of coal-smoke pollution enterprises, and the small scale integral management of non-point source contamination.

Key words: Bemisia tabaci, Natural population, Life table, Index of population development trend, Exclusion index of population control