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Shrub encroachment can reverse desertification in semi-arid Mediterranean grasslands
Fernando T Maestre1, Matthew A Bowker, María D Puche
1Area de Biodiversidad y Conservación, Departamento de Biología y Geología, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, 28933 Móstoles, Spain. fernando.maestre@urjc.es
Shrub encroachment in drylands may not indicate desertification. In Mediterranean grasslands, it improved plant richness, soil fertility, and microbial biomass, suggesting a reversal of desertification.
Area of Science:
- Ecology
- Soil Science
- Botany
Background:
- Shrub encroachment in drylands is often linked to desertification, but impacts are narrowly studied.
- Previous research focused on limited areas and a few effects of shrub encroachment.
Purpose of the Study:
- To evaluate shrub encroachment effects on biotic communities and ecosystem functions in Mediterranean grasslands.
- To determine if shrub encroachment in Stipa tenacissima grasslands signifies desertification or reversal.
Main Methods:
- Assessed vascular plant richness and diversity.
- Measured soil microbial biomass (fungi, actinomycetes, bacteria).
- Analyzed soil fertility indicators and nitrogen (N) mineralization rates.
Main Results:
- Shrub encroachment increased vascular plant richness.
- Enhanced biomass of soil fungi, actinomycetes, and bacteria.
- Linked shrub encroachment to improved soil fertility and N mineralization.
Conclusions:
- Shrub encroachment in Mediterranean grasslands does not universally indicate desertification.
- Shrub establishment may be a key process in reversing desertification in this region.
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