【摘要】 本文着重论述了三北农田防护林在林带结构上的重要性,在这一地区的385万平方公里的面积上,它的环境容量和生态条件是非常脆弱的。增加这个地区的绿色覆盖面积,将根本上改变它的生态条件和现有状态,藉以建立一种综合的生态系统,来促进该地区生态农业的建立和发展。本文又论述和分析了“大农业”是不符合于生态学的观点,同时,也不适应于现行的商品经济发展的需要,因为在自然界中是综合的,而人们的需求往往是单一的。更多还原

【Abstract】 This paper emphasizes the important construction of shelterbelt ecosystem in Northeast, North and Northwest areas of China because in the 3850000km area, the environmental capacity and ecological condition are most feeble. The green cover will change the ecological conditions and basic situation in order to establish the comprehensive ecosystem (ecological agriculture).The author analysed and Convinced that the opinion of "large Agriculture" is not suitable for the ecological point of view and merchandized economics in the present time, because it is divergent in nature and convergent in human thought.更多还原