At first , the relations between vegetation structures and their controlling soil erosion are discussed . the results show that magnitude of plant community coverage or canopy closure is n ' t certainly the adequate condition of an anti - erosive effective community because the community function of soil and water conservation is related to height of coverage layer as well as community coverage or canopy closure 首先,讨论了植被结构与其防止土壤侵蚀作用的关系,结果表明,植被盖度或郁闭度的大小并不一定就是防蚀有效植被的充分条件,植被保持水土功能还与覆盖层的高度密切相关,覆盖层高度大并不有利于植被保持水土。
In order to make the agriculture and rural economy of this area keep on fast , persistent and stable developing , it must be on the basis of controlling soil erosion and improving eco - environment , and on the advanced science and technology to combine enhancing yields of main farm product with increasing peasant ' s incomes , to support resource exploitation , and to raise technical level of agriculture industry 从渭北旱原资源开发历史和经验中可得出,该区域实现农业和农村经济持续发展的途径和措施是:以提高水资源利用效率为中心,以挖掘资源潜力、充分发挥资源优势为基础,以科技进步为先导,着力提高农业产业技术水平,以控制水土流失、改善生态环境为前提,把增加重要农产品产量与增加农民收入统一起来。