Savanna woody encroachment is widespread across three continents

Nicola Stevens, Caroline E.r. Lehmann, Brett P. Murphy, Giselda Durigan

Research output: Contribution to journalArticlepeer-review


Tropical savannas are a globally extensive biome prone to rapid vegetation change in response to changing environmental conditions. Via a meta-analysis, we quantified savanna woody vegetation change spanning the last century. We found a global trend of woody encroachment that was established prior the 1980s. However, there is critical regional variation in the magnitude of encroachment. Woody cover is increasing most rapidly in the remaining uncleared savannas of South America, most likely due to fire suppression and land fragmentation. In contrast, Australia has experienced low rates of encroachment. When accounting for land-use, African savannas have a mean rate annual woody cover increase two and a half times that of Australian savannas. In Africa, encroachment occurs across multiple land uses and is accelerating over time. In Africa and Australia, rising atmospheric CO2, changing land management and rainfall are likely causes. We argue that the functional traits of each woody flora, specifically the N-fixing ability and architecture of woody plants, are critical to predicting encroachment over the next century and that African savannas are at high risk of widespread vegetation change.
Original languageEnglish
Pages (from-to)235-244
JournalGlobal Change Biology
Issue number1
Early online date2 Jul 2016
Publication statusPublished - 1 Jan 2017


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