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Predicting drought tolerance from slope aspect preference in restored plant communities
Sarah Kimball1, Megan E Lulow2, Kathleen R Balazs2
1Center for Environmental Biology University of California Irvine CA 92697-1450 USA.
Ecology and Evolution
|May 9, 2017
Summary
Plants use different strategies to survive drought. Perennial plants thriving in dry areas endured drought, while annual plants escaped it, showing varied population dynamics in changing landscapes.
Area of Science:
- Ecology
- Plant Physiology
- Restoration Ecology
Background:
- Plants utilize tolerance, endurance, and avoidance strategies to manage aridity across space and time.
- Understanding how these strategies influence species abundance in heterogeneous landscapes remains a challenge.
Purpose of the Study:
- To investigate if species abundant in drier microhabitats exhibit enhanced drought survival.
- To determine the relationship between occupied sites, temporal dynamics, and physiological capacities for stress and dormancy.
Main Methods:
- A restoration project on two slope aspects (S-facing and N-facing) was utilized to test drought survival and abundance patterns.
- Species abundance and cover were monitored across different microhabitats and during an extreme drought event.
Main Results:
- Perennial species that established and grew well on S-facing slopes showed increased cover during drought, indicating drought tolerance and endurance.
- Annual species employing drought-escape strategies were less abundant on S-facing slopes during drought compared to N-facing slopes.
Conclusions:
- Different functional strategies interact with spatial and temporal heterogeneity to shape plant population and community dynamics.
- Large-scale restoration projects offer valuable opportunities for studying fundamental ecological questions regarding plant adaptation and survival.
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