论黄土高原种植业三元结构的几个问题

On cropping system of cereal cash forage three units structure in the loess plateau

粮料分流，建立种植业三元结构是解决黄土高原粮食问题的必然选择。因此，大力发展饲料粮生产是今后黄土高原种植业结构调整的必然方向。研究认为，黄土高原饲料作物播种面积占粮食作物总播种面积的比例应在 ２５％ 以上；提出了分层次建立黄土高原种植业三元结构和加大宏观调控力度的构想，强调了在农户层次上建立粮经饲结合种植模式和轮作制度的作用及意义；分析了本区可供开拓的饲料作物的潜在生态位资源以及粮饲结构调整的种植模式及其效益。

To separate cereal crop from forage crop and build a cropping system of cereal cash forage three units structure is an inevitable choice of solving grain problem in the Loess Plateau.So increasing forage crop production is a major approach of the cropping system adjustment in this area. The results in dicnte that the planting area of forage crop should keep above 25% of the total grain planting area; It put fornard the idea of building cereal cash forage three units structure in the loess Plateau and strengthening macro control power, and stressed the significance of building cereal cash forage combination crop patterns and rotation system in peasant household administrative levels; It also analysed potential niche resources of forage crop in the loess plateau. And Finally, it expounded the crop patterns and benefit of cereal cash forage three units structure in the Loess Plateau.\;