兰州南北两山绿化区植物与植被类型初查

通过对兰州南北两山环境绿化工程区进行植物、植被类型调查，结果表明：该项目区内植物资源相对丰富，有植物185种，分属于56科；区内植物生长状况良好，植物群落趋向多元化，且稳定性增加；按照植物群落学—生态学原则，并参考中国植被分类系统，将工程区内植被类型划分为９种类型，即 2种天然植被类型和7种人工植被类型。根据当前所造林分多为结构单一的纯林的现状，认为今后在南北两山进行植树造林应考虑营造混交林，以提高林分稳定性和抵御病虫害的能力，并积极采用人工措施促进森林更新。

Preliminary Investigation into Plant and Vegetation Types in Afforestation Region in Southern and Northern Mountains of Lanzhou City

The plants and vegetation types of the environmental afforestation project regions in the northern and southern mountains of Lanzhou were investigated.The results indicate that the vegetation types are relatively abundant,including 185 species which can be divided into 56 families;the growth status of the plants is good;the plant communities tend to be diversifying and their stability increase.According to plant community-ecology principle,the afforestation regions can be divided into 9 zones,including 2 natural plant zones and 7 planted zones.Considering present situations,it is better to plant mixed forests,strengthen the forest stability and its ability to resist plant diseases and insect pests,and simultaneously to promote forest's renewing by artificial measures.