Do fragment size and edge effects predict carbon stocks in trees and lianas in tropical forests?

Silva Magnago, Luiz Fernando, Magrach, Ainhoa, Barlow, Jos, Schaefer, Carlos Ernesto Goncalves Reynaud, Laurance, William F., Martins, Sebastião Venâncio, and Edwards, David P. (2017) Do fragment size and edge effects predict carbon stocks in trees and lianas in tropical forests? Functional Ecology, 31 (2). pp. 542-552.

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1. Tropical forests are critical for protecting global biodiversity and carbon stores. While forest degradation and fragmentation cause negative impacts on trees, many woody lianas benefit, with associated negative effects on carbon storage. Here, we focus on the key question of how abiotic environmental changes resulting from tropical forest fragmentation mediate the allocation of carbon into trees and lianas.

2. We focus on the globally threatened Brazilian Atlantic Forest, in forest fragments spanning 13-23 442 ha in area and at fragment edges and interiors. Within each fragment, we established two transects: one at the edge and one in the interior. Each transect consisted of ten 10 x 10 m plots spaced at 20 m intervals. Within each plot, we sampled living trees with diameter >= 4.8 cm at 1.3 m above ground, living lianas with diameter >= 1.6 cm at 10 cm above ground, and several microclimatic and soil variables.

3. Fragmentation changed a broad suite of abiotic environmental conditions recognized as being associated with forest carbon stocks: edges and smaller fragments were hotter, windier, and less humid, with more fertile and less acid soils at edges. Tree carbon stocks were thus higher in forest interiors than at edges, and were positively related to fragment size in interiors, but were not impacted by fragment size at edges.

4. Trees and lianas showed different responses to fragmentation: in interiors of small fragments, tree carbon stocks declined whereas liana carbon stocks increased; and at edges, tree carbon stocks were not affected by fragment size, whereas liana carbon stocks were highest in smaller fragments. These patterns were strongly related to changes in abiotic environmental conditions.

5. We conclude that the abiotic changes across the fragmentation gradient, rather than liana proliferation, were more likely to reduce tree carbon stocks. Cutting of lianas is frequently promoted for restoring forest carbon in human-modified tropical forests. However, this approach may not be effective for restoring forest carbon stocks in fragmented forests.

Item ID: 50493
Item Type: Article (Research - C1)
ISSN: 1365-2435
Keywords: air temperature, biomass, carbon cycle, desiccation, microclimate, REDD, soil fertility
Funders: Brazilian Agency for Science and Techology (CNPq), Brazilian Federal Agency for Support and Evaluation of Graduate Education (CAPES), Basque Government (BG), European Commission (EU)
Projects and Grants: CNPq grant no. 477780/2009-1, CAPES Brazilian Studentship grant, CAPES Doctorate Sandwich Program grant, BG Postdoctoral Fellowship, EU H2020 MSCA RISE ODYSSEA grant agreement no. 691053, CAPES PNPD
Date Deposited: 20 Sep 2017 09:37
FoR Codes: 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410401 Conservation and biodiversity @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960899 Flora, Fauna and Biodiversity of Environments not elsewhere classified @ 100%
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