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Restoring oak forests through direct seeding or planting: Protocol for a continental-scale experiment.
Alexandro B Leverkus1,2, Laura Levy1, Enrique Andivia3
1Departamento de Ecología, Facultad de Ciencias, Universidad de Granada, Granada, Spain.
Plos One
|November 4, 2021
Summary
Direct seeding and planting are two methods for revegetation, with outcomes influenced by species traits and environment. This study compares these methods across Europe using oak (Quercus) species to understand seedling success factors.
Area of Science:
- Ecological restoration
- Forestry science
- Plant ecology
Background:
- Revegetation success depends on seedling establishment, influenced by methods like direct seeding versus planting nursery-grown seedlings.
- Factors such as herbivory, drought, species identity, and plant traits interact with environmental conditions to affect seedling survival.
- Oak (Quercus) species are ecologically and economically relevant and widely distributed, making them ideal for continental-scale ecological studies.
Purpose of the Study:
- To compare the effectiveness of direct seeding versus planting for seedling establishment across diverse European environments.
- To investigate how species identity, plant functional traits (e.g., seed size), and environmental conditions mediate the success of different revegetation methods.
- To provide a continental-scale assessment of the seeding versus planting dilemma in ecological restoration.
Main Methods:
- A continental-scale experiment replicated across multiple sites in Europe, involving direct seeding and planting of native oak (Quercus) species.
- Standardized protocols for seed collection, nursery cultivation, outplanting, herbivore protection, site maintenance, and performance measurements.
- Mixed-effects meta-analysis to analyze effect sizes from seedling performance and environmental variables across sites and species.
Main Results:
- The study will assess the main effects of revegetation method, species, and plant functional traits on seedling performance.
- It will evaluate the influence of site-specific environmental moderators on the success of seeding versus planting.
- Differences in seedling performance will be analyzed in relation to environmental conditions, seed size, functional traits, and species relatedness.
Conclusions:
- This research will offer a continental-scale perspective on the direct seeding versus planting debate in ecological restoration.
- Findings will elucidate the role of environmental heterogeneity, species-specific traits, and phylogenetic factors in determining the optimal revegetation strategy.
- The study aims to inform more effective and adaptable restoration practices for forest ecosystems.
