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Trees : Volume 19, Issue 2, March 2005

Trees : Volume 19, Issue 1, January 2005

Drought effects on seedling survival in a tropical moist forest

Content Provider	Springer Nature Link
Author	Engelbrecht, Bettina M. J. Kursar, Thomas A. Tyree, Melvin T.
Copyright Year	2005
Abstract	The amount and seasonality of rainfall varies strongly in the tropics, and plant species abundance, distribution and diversity are correlated with rainfall. Drought periods leading to plant stress occur not only in dry forests, but also in moist and even wet forests. We quantified experimentally the effect of drought on survival of first year seedlings of 28 co-occurring tropical woody plant species in the understory of a tropical moist forest. The seedlings were transplanted to plots and subjected to a drought and an irrigation treatment for 22 weeks during the dry season. Drought effects on mortality and wilting behavior varied greatly among species, so that relative survival in the dry treatment ranged from 0% to about 100% of that in the irrigated treatment. Drought stress was the main factor in mortality, causing about 90% (median) of the total mortality observed in the dry treatment. In almost half of the species, the difference in survival between treatments was not significant even after 22 weeks, implying that many of the species are well adapted to drought in this forest. Relative drought survival was significantly higher in species associated with dry habitats than in those associated with wet habitats, and in species with higher abundance on the dry side of the Isthmus of Panama, than in those more abundant on the wet side. These data show that differential species survival in response to drought, combined with variation in soil moisture availability, may be important for species distribution at the local and regional scale in many tropical forests.
Starting Page	312
Ending Page	321
Page Count	10
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	19
Issue Number	3
e-ISSN	14322285
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-03-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mortality Drought performance Irrigation Soil moisture Tropical moist forest
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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