NDLI: The relative contribution of short-term versus long-term effects in shrub-understory species interactions under arid conditions

Content Provider	Springer Nature Link
Author	umi, Zouhaier Chaieb, Mohamed Bagousse Pinguet, Yoann Michalet, Richard
Copyright Year	2015
Abstract	Plant–plant interactions (competition and facilitation) in terrestrial ecosystems include: (1) short-term effects, primarily quantified with experimental removals; and (2) long-term effects, mostly due to soil weathering processes, primarily quantified with observational methods. It has been argued that these effects are likely to vary in contrasting directions with increasing drought stress in arid systems. However, few studies have used appropriate methodology to assess both types of effects and their variation across nurse species and environmental conditions, in particular in arid systems. This knowledge is crucial for predicting variation in the mediating role of facilitation with climate change and assessing the importance of nurse effects in ecological restoration. In the arid climate of central-south Tunisia, understory species’ biomass, abundance and composition and soil parameters were compared in shrub-control, shrub-removed and open areas for three shrub species and in two habitats with contrasting soil moisture conditions. Long-term effects were dominant, positive for all three shrub species and associated with increasing nutrient content in shrub patches. Short-term effects, mainly related to water consumption, were weaker, mostly negative and dependent on shrub species. Additionally, long-term effects were less positive and short-term effects more negative in the dry habitat than in the wet habitat. Our study provides evidence of the primary influence of positive (facilitative) long-term effects in this arid system. However, the net effects of shrubs could be less beneficial for other species with increasing aridity under climate change, due to both a decrease in positive long-term effects and an increase in negative short-term effects.
Starting Page	529
Ending Page	542
Page Count	14
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	180
Issue Number	2
e-ISSN	14321939
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-11-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arid communities Canopy effect Competition Facilitation Soil effect Ecology Plant Sciences Hydrology/Water Resources
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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