随着造林工作的不断开展，林种结构也相继出现较大变化，就是说，栽植果树的比重越来越大（一般占造林面积的４０％～７０％）。但是，一些单位和个人，不注重果园的长远建设，忽视了果园防护林的作用。大家知道，本地区属季风大陆性气候，自然条件脆弱，春季多是干旱、少... With the continual afforestation work, the structure of the forest species has also undergone major changes in succession, that is, the proportion of the planting fruit trees is increasing (generally, accounting for 40% to 70% of the afforestation area). However, some units and individuals do not pay attention to the long-term construction of orchards and neglect the role of orchards in protecting orchards. As we all know, this area belongs to the monsoon continental climate, the natural conditions are fragile, and the spring is mostly arid and less ...