The study of effects of acid rain in Southwestern China on forest ecosystems .has been inrestigated since 1984. The results have shown that the ecosystem of Pin
There is a close relationship between agricultural production and environmental meteorological conditions. In the study of the correlation between them, the sim
This is the first half of a review article, which deals with merits and demerits in many aspects of using pesticides, particularly in China for years. The secon