【摘要】 <正> 多年来,人们对水旱轮作的增产效果和经济效益有很多研究,但对它的生态效益研究不多。其实,水旱轮作之所以增产,产生巨大的经济效益,其根源还是水旱轮作所带来的良好的生态效益所致。本文从生态效应的角度,初步探讨了水旱轮作的增产原因。一、综合治理“水袋子”,大力开展水旱轮作1.开展水旱轮作,促进粮棉高产稳产全县现有耕地7.087×10~4ha,其中稻田4.197×10~4ha;棉田1.607×10~4ha。利用本县丰富的水资源(年客水量1.36×10~9m~3),根据农田生产线基本平行于水位线的特点,1970年开始实行水旱轮作,随着水利条件的逐更多还原

【Abstract】 In consideration of the low elevation and high under groundwater level in Honghu county, the agricultural and ecological benefits of lowland-upland rotation were discussed from the oxidation-reduction theory. The rotation years of water-dry shift for cotton cultivation were suggested at 6-7 years and dry-water shift for rice cultivation at 4 years, which might facilitate the fuller circling of soil nutrients and the continuous increasement of yield productions. Conditions for the optimum ecological benefits were also discussed.更多还原