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拜泉县三北防护林一期工程树种多为杨树。随着树龄的增加，树身的上长和根系的延伸，危及农作物的生长和发育；被威胁面积的农作物，轻者减产７０％以上，重者绝产。挖掘土地潜力，开发利用树荫地区已引起关注。该县开展了树荫地人工栽培灌木树种对比试验。经过三年的试验，实践证明．农防林树荫地种植胡枝子是理想的灌木树种．胡枝子用途广，投资少，产量高．见效快，易于经营，深受农民欢迎。
Baiquan County Three North Shelterbelt a project mostly poplar. With the increase of the tree age, the length of the tree and the extension of the root system jeopardize the growth and development of the crops. Crops under threat are reduced by more than 70% and those who are seriously weakened by weight. Mining the potential of the land, development and utilization of shade area has attracted attention. The county carried out contrast cultivation of shrubs in shrubs. After three years of trial, practice proved. Cultivation of Lespedeza bicolor in shade-resistant forest is the ideal shrub species. Lespedeza widely used, less investment, high yield. Quick, easy to operate, welcomed by farmers.