目前,我们在造林、更新实践工作中,主要是依靠理论及经验来确定造林工艺设计树种。这种方法带有一定的主观性,这是因为人们生产实践经验和理论、认识的差异所致。例如在同一造林地块上,为同一目的,每人选择的造林树种及具体设计方案难以达到完全一致,且又各不十分完备,很难选定最优的方案及典型设计,这势必造 At present, in afforestation, renewal and practice, we rely mainly on theory and experience to determine afforestation design tree species. This method has some subjectivity, this is because people produce practical experience and theory, the difference caused by understanding. For example, on the same afforestation plots, the afforestation tree species and specific design options each person chooses can not reach the same goal for the same purpose, and each of them is not very complete. Therefore, it is very difficult to select the optimal plan and the typical design.