Published In

Journal of the Torrey Botanical Society

Document Type

Article

Publication Date

2008

Subjects

Trees -- Seedlings, Forest canopy gaps

Abstract

Gaps in the forest canopy can increase the diversity of tree regeneration. Understory shrubs also compete with tree seedlings for limited resources and may depress tree recruitment. We compared effects of shrub removal and canopy windthrow gaps on seedling recruitment and understory resource levels. Shrub removal, with the canopy left intact, was associated with increased levels of understory light and soil moisture and coincided with increased species richness and diversity of tree regeneration compared to both control plots and canopy gaps. Canopy windthrow gaps, however, resulted in a more than 500 fold increase in soil nitrate concentrations, and seedling growth rates that were twice as high as that observed with shrub removal. Our results suggest that gaps in the understory shrub layer and the overstory canopy may have complementary effects on resource availability with corresponding benefits to seedling establishment and growth.

Description

This is the publisher's final PDF. Originally published in the Journal of the Torrey Botanical Society (http://www.torreybotanical.org/publications/journal/) and is copyrighted by the Torrey Botanical Society.

Persistent Identifier

http://archives.pdx.edu/ds/psu/12173

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