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The success of woody plant removal depends on encroachment stage and plant traits
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Journal Article
The success of woody plant removal depends on encroachment stage and plant traits
2023
Overview
Woody plants (shrubs and trees) are encroaching across the globe, affecting livestock production and terrestrial ecosystem functioning. Despite the widespread practice, there has been no quantitative global assessment of whether removal of encroaching woody plants will re-instate productive grasslands and open savanna. Here we compiled a global database of 12,198 records from 524 studies on the ecosystem responses of both the encroachment and removal of woody plants, and show that removal fails to reverse encroachment impacts. Removing woody plants only reversed less than half of the reductions in herbaceous structure induced by encroachment, and woody expansion actually enhanced ecosystem functions (+8%). The effectiveness of removal varied with encroachment stage (that is, time since treatment) and the functional traits (for example, deciduousness and resprouting) of the focal woody species, and waned in drier regions. Our results suggest that assessment of woody plant communities before removal is critical to assess the likelihood of successful ecosystem recovery.A global synthesis reveals that removing woody plants cannot compensate for losses caused by their expansion. The effectiveness of removing woody plants depends on their identity and how long a site has been encroached.
Publisher
Nature Publishing Group
Subject
