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Home NEWS Science News

Land repair vital for survival

Bioengineer by Bioengineer
July 22, 2021
in Science News
Reading Time: 4 mins read
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Successful dryland restoration to benefit 2bn people

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Credit: Flinders University

Restoration of degraded drylands is urgently needed to mitigate climate change, reverse desertification and secure livelihoods for the two billion people who live there, experts warn in a major new paper in Nature Ecology & Evolution.

Scientists leading the Global Arid Zone Project examined restoration seeding outcomes at 174 sites on six continents, encompassing 594,065 observations of 671 plant species – with the lessons learned important to meeting ambitious future restoration targets.

Flinders University Dr Martin Breed, one of three Australian researchers who helped coordinate data collection for the live database, says the new paper is really important for Australia.

“Much of Australia is drylands and huge areas of these drylands in Australia are degraded,” he says. “They have been cleared, unsustainably farmed, burnt in megafires and generally not taken good care of. Accordingly, vast areas of our drylands are now being restored to help return biodiversity and supply many important ecosystem services, such as clean air and water, supporting our good mental health and increasing agricultural productivity.

“This restoration usually requires revegetation, primarily via re-seeding areas.

“The scale of this re-seeding effort globally is truly enormous, encouraged no less by the UN Decade on Ecosystem Restoration that started this year. The annual budgets involved are in the 10s to 100s billions of dollars,” Dr Breed says.

“This research lays a solid foundation to innovate new ways to effectively re-seed areas.

“It brings together a global understanding of how effective this re-seeding is in these drylands. It shows that re-seeding generally works – if you sow the seeds, the plant has a good chance of being there in the future.

“However, re-seeding is really risky, with almost 20% of seeding events failing. Alarmingly, this risk increased as areas were more arid – and with the realised and predicted increases in aridity with climate change, this does not bode well for seed-based restoration in drylands.”

The Nature Ecology & Evolution article says there are reasons for optimism, even though the global targets set for dryland restoration to restore millions of hectares of degraded land have been questioned as overly ambitious.

But without a global evaluation of successes and failures it is impossible to gauge feasibility, the researchers say, pointing out:

Seeding had a positive impact on species presence: in almost a third of all treatments, 100% of species seeded were growing at first monitoring.

However, dryland restoration is risky: 17% of projects failed, with no establishment of any seeded species, and consistent declines were found in seeded species as projects matured.

Across projects, higher seeding rates and larger seed sizes resulted in a greater probability of recruitment, with further influences on species success including site aridity, taxonomic identity and species life form.

The findings suggest that investigations examining these predictive factors will yield more effective and informed restoration decision-making.

###

Lead investigators in the Global Arid Zone Project are Assistant Professor Nancy Shackelford, Restoration of Natural Systems Director at University of Victoria, British Columbia, Canada (@drylandrestore) and Professor Katharine Suding, Colorado University at Boulder.

Dr Gustavo Paterno, Universidade Federal do Rio Grande do Norte, Brazil was corresponding lead author on the new paper with Dr Shackelford.

In Australia, Dr Martin Breed (Flinders University), Dr Todd Erickson (University of Western Australia) and Dr Peter Harrison (University of Tasmania) are collaborating on the steering committee of the Global Arid Zone Project.

The article, Drivers of seedling establishment success in dryland restoration efforts (23 July 2021) by Nancy Shackelford, Gustavo B Paterno, Daniel E Winkler, Todd E Erickson, Elizabeth A Leger, Lauren N Svejcar, Martin F Breed, Akasha M Faist, Peter A Harrison, Michael F Curran, Qinfeng Guo, Anita Kirmer, Darin J Law, Kevin Z Mganga, Seth M Munson, Lauren M Porensky, R Emiliano Quiroga, Péter Török, Claire E Wainwright, Ali Abdullahi, Matt A Bahm, Elizabeth A Ballenger, Nichole Barger, Owen W Baughman, Carina Becker, Manuel Esteban Lucas-Borja, Chad S Boyd, Carla M Burton, Philip J Burton, Eman Calleja, Peter J Carrick, Alex Caruana, Charlie D Clements, Kirk W Davies, Balázs Deák, Jessica Drake, Sandra Dullau, Joshua Eldridge, Erin Espeland, Hannah L Farrell, Stephen E Fick, Magda Garbowski, Enrique G de la Riva, Peter J Golos, Penelope A Grey, Barry Heydenrych, Patricia M Holmes, Jeremy J James, Jayne Jonas-Bratten, Réka Kiss, Andrea T Kramer, Julie E Larson, Juan Lorite, C Ellery Mayence, Luis Merino-Martín, Tamás Miglécz, Suanne Jane Milton, Thomas A Monaco, Arlee M Montalvo, Jose A Navarro-Cano, Mark W Paschke, Pablo Luis Peri, Monica L Pokorny, Matthew J Rinella, Nelmarie Saayman, Merilynn C Schantz, Tina Schroeder, Eric W Seabloom, Katharine L Stuble, Shauna M Uselman, Orsolya Valkó, Kari Veblen, Scott Wilson, Megan Wong, Zhiwei Xu and Katharine L Suding has been published in Nature Ecology & Evolution DOI: 10.1038/s41559-021-01510-3

Media Contact
Dr Martin Breed
[email protected]

Related Journal Article

http://dx.doi.org/10.1038/s41559-021-01510-3

Tags: AgricultureBusiness/EconomicsClimate ChangeEarth ScienceEnvironmental HealthGeology/SoilHydrology/Water ResourcesNaturePollution/Remediation
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