“三北”是全国森林分布最少的地区,森林覆盖率只有2.1%。由于森林覆盖率低,水土流失特别严重,仅黄土高原每年流入黄河的泥沙就有16亿吨之多,我省竟占8亿多吨。渭北高原沟壑区大部分县、市是水土流失重点县,农业产量低而不稳,“四料”缺乏。因此,在保护好现有森林植被的基础上,迅速提高森林覆盖率,控制水土流失,实为当务之急。去年,我参加了“三北”防护林建设第一期工程的规划设计工作。在设计中,对渭北高原沟壑区荒山造林树种的选择问题曾有过争议。有人认为:刺槐材质不好,是万年脏,群众不喜爱,应提高油松的 “Three Norths” is the region with the least forest distribution in the country with a forest coverage rate of only 2.1%. Due to low forest cover and particularly serious soil erosion, only 1.6 billion tons of sediment flows into the Yellow River each year, accounting for more than 800 million tons in our province. Most counties and cities in the gully area of ​​Weibei Plateau are key counties for soil and water loss, with low and unstable agricultural output and lack of “four materials”. Therefore, on the basis of protecting existing forest vegetation, it is imperative to rapidly increase forest cover and control soil and water loss. Last year, I participated in the planning and design of the first phase of the “Three North” shelterbelt construction project. In the design, there has been controversy over the choice of afforestation tree species in the afforested hills in the gully area of ​​the Weibei Plateau. Some people think: acacia material is not good, is a thousand years dirty, the masses do not like, should increase the pine