银川市解放前只有树木4000株左右,大多是杨、柳、榆.58年开始大量植树,特别是63～65年,每年都栽植大量行道树、庭荫树.72年统计,银川市有树木250多万株,但到78年底只有60多万株,保存率不足20%.其原因,一是人为损害(包括迁移砍伐); Before the liberation of Yinchuan City, only about 4,000 trees, mostly Yang, Liu, elm. 58 years began planting a large number of trees, especially 63 to 65 years, each year a large number of trees planted, Tingyin trees 72 years statistics, Yinchuan City has trees 250 But there were only about 600,000 strains at the end of 78, with a preservation rate of less than 20%. The reasons for this are as follows: first, human damage (including the removal of deforestation);