赤红壤开垦利用后生态环境的变化

CHANGE IN THE ECOLOGICAL ENVIRONMENT OF RECLAIMED LATERITIC RED EARTH

In recent 30 years, the site experiment of reclaimed laleritic red earth demonstrated that the ecological environment of soil varies with farming systems of two crops a year, one crop a year and one crop many years, relating to, for instance, the type and quantity of weeds and insects, soil nutrient contents and physical properties, soil desertification microbical composition and activity, etc. In farming plots, one crop many year is favorable to raise soil fertility and crop yield, and to improve soil ecological environment, where perennial green manure pla s an espically important role.