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

本文主要研究赤红壤开垦利用后采用一年一熟,一年二熟及多年一熟制的土壤生态环境变化,如自然植被作物代替,随着利用时间的延续,田间杂草种类及密度增加;动物及害虫增多,土壤养分减少和沙化显著。30年试验结果表明不同轮作方式对土壤生态环境及经济效益的影响不同,其中以轮种绿肥的多年一熟制效果较好。

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.