我国北方地区,约有二分之一以上的耕地属干旱、半干旱性的土地。这里的牧草种类大多数是豆科植物。它们耐旱、耐瘠薄、适应性广。柔软的枝叶含有丰富的蛋白质、粗纤维和多种营养成分,是载畜的饲草。其匍匐在地面的茎叶和发达的地下根系有固沙、固土、护地和防止水肥流失等方面的重要作用。如果在农业生产和农田建设中将它们实行合理的间、套、 About half of the arable land in northern China is arid and semi-arid lands. Most of the forage species here are legumes. They are drought-tolerant, barren-tolerant and have wide adaptability. Soft foliage is rich in protein, crude fiber and a variety of nutrients, is livestock forage. Its prostrate on the ground stems and leaves and developed underground roots with sand, solid soil, protect the land and prevent water loss and other important role. If they are implemented in agricultural production and farmland construction in a reasonable way,