三峡库区坡地新建梨-旱稻复合系统生态经济效应研究

对三峡库区坡地梨-旱稻复合系统的生态经济效应进行了研究。结果表明:与清耕梨园相比,间作旱稻并秸秆还田后,不仅能改善梨园小气候环境,有良好的水土保持作用和改土培肥效果,而且能提高叶片叶绿素含量和光合速率,改善果实内在品质。同时能有效控制田间杂草,减少梨园病虫害的发生,且可消减非点源N污染负荷60.19kg/hm2,非点源P污染负荷8.0kg/hm2。与单一系统相比,复合系统能提高土地利用率44%,具有显著的经济效益。

Economic and Ecological Effects of Newly Built Pear-Upland Rice System in Sloping Land in Three Gorges Reservoir Area

The economic and ecological effects of the pear-upland rice system in sloping land in Three Georges reservoir area were analyzed in this paper. Comparing with the pear mono-cropping orchard, the new pear-upland rice system indicated that:(1)It improved the microclimate environment and soil fertility, reducing soil and water losses and decreased the soil erosion;(2)It increased the content of chlorophyll of pear leaves and the photosynthetic rate, and also improved the intrinsic quality of pear;(3) Weed and pest can be significantly controlled in the system so that it could reduce or limit the application of herbicide and pesticide which resulted in 60.19 kg N/hm~2 and 8.0 kg P/hm~2 of non-point source pollution load.(4)It could notably increase the economic benefits, and the land utilization efficiency increased by 44%.