Published By US Fish and Wildlife Service, Department of the Interior
Issued mehr als 9 Jahre ago
Summary
Description
Several understory communities display successional stages during the first 200 years after logging or fire disturbance in the Coastal PiceaTsuga forests of southeast Alaska. Residual shrubs and tree seedlings increase their growth exponentially after overstory removal. Understory biomass peaks about 15 to 25 years after logging. Vascular plants are virtually eliminated from the understory after forest canopies close at stand ages of 25 to 35 years. Bryophytes and ferns dominate understory biomass during the following century. An understory of deciduous shrubs and herbs is reestablished after 140 to 160years. Thereafter, biomass of the vascular understory continues to increase, while bryophyte biomass and tree productivity decline. Departures from this developmental sequence are related to unusual types of stand establishment, soil, microclimate, or disturbance.
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