Old growth Afrotropical forests critical for maintaining forest carbon

dc.contributor.author

Poulsen, JR

dc.contributor.author

Medjibe, VP

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White, LJT

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Miao, Z

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Banak-Ngok, L

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Beirne, C

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Clark, CJ

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Cuni-Sanchez, A

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Disney, M

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Doucet, JL

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Lee, ME

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Lewis, SL

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Mitchard, E

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Nuñez, CL

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Reitsma, J

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Saatchi, S

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Scott, CT

dc.date.accessioned

2022-02-01T14:36:49Z

dc.date.available

2022-02-01T14:36:49Z

dc.date.issued

2020-10-01

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2022-02-01T14:36:47Z

dc.description.abstract

Aim: Large trees [≥ 70 cm diameter at breast height (DBH)] contribute disproportionately to aboveground carbon stock (AGC) across the tropics but may be vulnerable to changing climate and human activities. Here we determine the distribution, drivers and threats to large trees and high carbon forest. Location: Central Africa. Time period: Current. Major taxa studied: Trees. Methods: Using Gabon's new National Resource Inventory of 104 field sites, AGC was calculated from 67,466 trees from 578 species and 97 genera. Power and Michaelis–Menten models assessed the contribution of large trees to AGC. Environmental and anthropogenic drivers of AGC, large trees, and stand variables were modelled using Akaike’s information criterion (AIC) weights to calculate average regression coefficients for all p. ossible models. Results: Mean AGC for trees ≥ 10 cm DBH in Gabonese forestlands was 141.7 Mg C/ha, with averages of 166.6, 171.3 and 96.6 Mg C/ha in old growth, concession and secondary forest. High carbon forests occurred where large trees are most abundant: 31% of AGC was stored in large trees (2.3% of all stems). Human activities largely drove variation in AGC and large trees, but climate and edaphic conditions also determined stand variables (basal area, tree height, wood density, stem density). AGC and large trees increased with distance from human settlements; AGC was 40% lower in secondary than primary and concession forests and 33% higher in protected than non-managed areas. Main conclusions: AGC and large trees were negatively associated with human activities, highlighting the importance of forest management. Redefining large trees as ≥ 50 cm DBH (4.3% more stems) would account for 20% more AGC. This study demonstrates that protecting relatively undisturbed forests can be disproportionately effective in conserving carbon and suggests that including sustainable forestry in programs like reduced emissions for deforestation and forest degradation could maintain carbon dense forests in logging concessions that are a large proportion of remaining Central African forests.

dc.identifier.issn

1466-822X

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1466-8238

dc.identifier.uri

https://hdl.handle.net/10161/24289

dc.language

en

dc.publisher

Wiley

dc.relation.ispartof

Global Ecology and Biogeography

dc.relation.isversionof

10.1111/geb.13150

dc.subject

aboveground biomass

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carbon

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Central Africa

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climate change

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Gabon

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large trees

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tree height

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tropical forest

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wood density

dc.title

Old growth Afrotropical forests critical for maintaining forest carbon

dc.type

Journal article

duke.contributor.orcid

Poulsen, JR|0000-0002-1532-9808

pubs.begin-page

1785

pubs.end-page

1798

pubs.issue

10

pubs.organisational-group

Duke

pubs.organisational-group

Nicholas School of the Environment

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Environmental Sciences and Policy

pubs.publication-status

Published

pubs.volume

29

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