陕北黄土高原白桦林初步研究

Preliminary Studies on the Betula Platyphylla Forests in Loess Plateau of Northern Shaanxi Province

白桦林是黄土区顶极森林群落破坏后的次生林代表之一，共含五个群丛，它们是：白桦—柔毛绣线菊—大披针苔；白桦—胡枝子—大披针苔；白桦—榛子—大披针苔；白桦—沙棘—大披针苔；白桦—胡颓子—大披针苔。它们将全被辽东栎林演替，辽东栎更新的临界光照强度是相对光照强度的３％左右。

The classification and succession of the betula platyphylla forest formed on the loessplateau after the destraction of the climax forest communities are discussed.