A global climate niche for giant trees. (2nd May 2018)

• Record Type: Journal Article
• Authors: Scheffer, Marten; Xu, Chi; Hantson, Stijn; Holmgren, Milena; Los, Sietse O.; van Nes, Egbert H.
• Is Part Of: Global change biology. Volume 24:Number 7(2018)
• Page Start: 2875
• Page End: 2883
• Publication Date: 2018-05-02
• Subjects: alternative ecosystem state -- canopy height -- LiDAR -- precipitation temperate rainforest -- remote sensing -- resilience -- threshold -- tropical rainforest; Climatic changes -- Environmental aspects -- Periodicals; Troposphere -- Environmental aspects -- Periodicals; Biodiversity conservation -- Periodicals; Eutrophication -- Periodicals; 551.5
• DOI: 10.1111/gcb.14167
• Languages: English
• ISSNs: 1354-1013

Abstract

Abstract: Rainforests are among the most charismatic as well as the most endangered ecosystems of the world. However, although the effects of climate change on tropical forests resilience is a focus of intense research, the conditions for their equally impressive temperate counterparts remain poorly understood, and it remains unclear whether tropical and temperate rainforests have fundamental similarities or not. Here we use new global data from high precision laser altimetry equipment on satellites to reveal for the first time that across climate zones 'giant forests' are a distinct and universal phenomenon, reflected in a separate mode of canopy height (~40 m) worldwide. Occurrence of these giant forests (cutoff height > 25 m) is negatively correlated with variability in rainfall and temperature. We also demonstrate that their distribution is sharply limited to situations with a mean annual precipitation above a threshold of 1, 500 mm that is surprisingly universal across tropical and temperate climates. The total area with such precipitation levels is projected to increase by ~4 million km 2 globally. Our results thus imply that strategic management could in principle facilitate the expansion of giant forests, securing critically endangered biodiversity as well as carbon storage in selected regions. Abstract : Rainforests are among the most charismatic as well as the most endangered ecosystems of the world. However, although the effects of climate change on tropical forests resilience is a focus of intense research, the conditions for their equally impressive temperate counterparts remain poorly understood and it remains unclear whether tropical and temperate rainforests have fundamental similarities or not. Here we use new global data from high precision laser altimetry equipment on satellites to reveal for the first time that across climate zones 'giant forests' are a distinct and universal phenomenon, reflected in a separate mode of canopy height worldwide. Moreover, we demonstrate that these giant forests are sharply limited to situations with low climatic variability and a mean annual precipitation above a threshold of 1, 500 mm that is surprisingly universal across tropical and temperate climates. Our results imply that in foreseen future climate scenarios, strategic management of a safe operating space for giant forests could facilitate their expansion, securing critically endangered biodiversity as well as carbon storage in selected regions.