摘要
Agricultural production activities are organic combinations between the courses of nat-ural reproduction and economic one. Natural reproduction course is the material base forthe agro-ecological and economic system uniformly operating. So the development ofagro-production has closely concerned with the ecological circumstances. The serious wat-
出处
《干旱区资源与环境》
CSCD
1993年第Z1期494-497,共4页
Journal of Arid Land Resources and Environment