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华北的荒山绿化多强调“三松二柏”,但多年的实践证明,几十年方能见效益的松柏,并没有把荒山绿化起来,没有制止住水土流失,也没有使山区人民得到明显的经济效益。而不甚被人重视的洋槐,在近年的荒山绿化中却发挥了很大的作用。根据密云县高岭乡四合村的经验,洋槐林既是水土保持林、薪炭林、用材林,又是饲料林(有人称之为“空中牧场”),它可以解放农村中一定程度的燃料、饲料和肥料的矛盾问题,可以改良土壤、提高地力,促进农林业增产。
The afforestation in northern China emphasizes “three pine and two cypress.” However, many years of practice have proved that the pines and pines, which can only see benefits for decades, have not afforested the barren hills, stopped the soil erosion and prevented the mountainous people from getting a clear economy benefit. The less-appreciated acacia has played a large role in the afforestation of barren hills in recent years. According to the experience of Sihe Village, Gaoling County, Miyun County, the acacia forest is not only a soil and water conservation forest, a fuelwood forest, a timber forest but also a feed forest (some call it “aerial pasture”), which liberates a certain level of fuel and feed in rural areas And the contradictions of fertilizers, can improve the soil, improve soil fertility and promote agricultural and forestry production.