“小老树”是指树龄较长,生长缓慢或停滞,长期变化不大的树木。其特点是高生长和粗生长明显低于正常发育的同类树种。形成“小老树”的原因主要有三个方面: 1、不同树种的遗传特性是形成小老树的内在因素。利用发育不良的枝条或苗木造林也可形成小老 “Small old tree” refers to trees that grow older, grow slowly or stagnate, and change little in the long run. It is characterized by high growth and coarse growth significantly lower than the normal development of similar species. There are mainly three reasons for the formation of “small old tree”: 1, the genetic characteristics of different species are the inherent factors of forming small old tree. The use of poor growth of branches or seedlings afforestation can also form small old