一、什么叫次生林 国外一般把森林划分为三代林:即第一代林称原始林,第二代林称次生林;第三代林称人工林。 国内有人把再生林、派生林、低价林萌生林(无性更新)、阔叶林、杂木林等视为次生林。我们认为,次生林是原始林受外因反复破坏形成的次生群落。 First, what is the secondary forest Foreign generally divided the forest into three generations of forests: the first generation of forest said the original forest, the second generation of forest called secondary forest; the third generation of forest called plantation. Some domestic people refer to the regenerated forest, the derivative forest, the low-cost forest Mengsheng forest (asexual update), the broad-leaved forest and the mixed wood forest as the secondary forest. In our opinion, the secondary forest is the secondary community formed by the repeated destruction of the original forest by external factors.