Increased grazing pressure threatens the most arid rangelands sciencemagazine
in drylands, a particularly important issue in oak woodlands that we studied in Portugal and were part of this work," points out Dr. Alice Nunes from the Centre for Ecology, Evolution and Environmental Changes at the Faculty of Sciences of the University of Lisbon and co-author of the study.
The impacts of increasing grazing pressure shifted from mostly positive in colder drylands with a lower rainfall seasonality and higher plant species richness to negative in hotter drylands with lower plant diversity and higher rainfall seasonality."There is no one-size-fits-all when it comes to grazing in drylands. Any effects of grazing, particularly overgrazing, will vary across the globe, making it important to consider local condition when managing livestock and wild herbivores" says Dr. David Eldridge from the University of New South Wales and coauthor of the study.Ranchers driving livestock in Patagonia . Credit: Sergio Velasco Ayuso.The authors also found positive relationships between plant species richness and the delivery of multiple ecosystem services such as soil carbon storage, erosion control, and both forage quality and quantity, regardless of grazing pressure."Our results highlight the importance of conserving and restoring diverse plant communities to prevent land degradation, ensure the delivery of essential ecosystems services for humans, and mitigate climate change in grazed drylands," says Ph.D. student Melanie Köbel from cE3c at Ciências ULisboa and co-author of the study. The findings of this study are of great relevance for achieving a more sustainable management of grazing, as well as for establishing effective management and restoration actions aimed at mitigating the effects of ongoing climate change and desertification across global drylands.Science
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