河北蔚县北山黄士丘陵地区,海拔900—1,400米,年平均降雨量为400毫米,而且70%集中于雨季(6、7、8月),冬春雨雪稀少,春风旱气强大,常常出现春旱。水土流失严重,土壤贫瘠,植被稀少,树木很难生长。近年来,蔚县人民在党的领导下,总结历年的经验教训,坚持抗旱造林,向三害(干旱、风沙、水土流失)展开战斗。以杨、柳、榆、沙枣、紫穗槐 Hebei Yuxian Beishan Huangshi hilly areas, 900-1,400 meters above sea level, the average annual rainfall of 400 mm, and 70% concentrated in the rainy season (June, July, August), rare in winter and spring rain, spring strong dry air, and often Spring drought. Severe soil erosion, poor soils, scarce vegetation and hard-to-grow trees. In recent years, under the leadership of the party, the people of Yuxian County have summed up the experience and lessons of the past years, insisted on fighting against drought and afforestation and started fighting against the three pests (drought, sandstorm and soil erosion). To Yang, Liu, Yu, date dates, Amorpha fruticosa