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Carbon stocks and fluxes in tropical lowland dipterocarp rainforests in Sabah, Malaysian Borneo


Saner, P; Loh, Y Y; Ong, R C; Hector, A (2012). Carbon stocks and fluxes in tropical lowland dipterocarp rainforests in Sabah, Malaysian Borneo. PLoS ONE, 7(1):e29642.

Abstract

Deforestation in the tropics is an important source of carbon C release to the atmosphere. To provide a sound scientific base for efforts taken to reduce emissions from deforestation and degradation (REDD+) good estimates of C stocks and fluxes are important. We present components of the C balance for selectively logged lowland tropical dipterocarp rainforest in the Malua Forest Reserve of Sabah, Malaysian Borneo. Total organic C in this area was 167.9 Mg C ha(-1)±3.8 (SD), including: Total aboveground (TAGC: 55%; 91.9 Mg C ha(-1)±2.9 SEM) and belowground carbon in trees (TBGC: 10%; 16.5 Mg C ha(-1)±0.5 SEM), deadwood (8%; 13.2 Mg C ha(-1)±3.5 SEM) and soil organic matter (SOM: 24%; 39.6 Mg C ha(-1)±0.9 SEM), understory vegetation (3%; 5.1 Mg C ha(-1)±1.7 SEM), standing litter (<1%; 0.7 Mg C ha(-1)±0.1 SEM) and fine root biomass (<1%; 0.9 Mg C ha(-1)±0.1 SEM). Fluxes included litterfall, a proxy for leaf net primary productivity (4.9 Mg C ha(-1) yr(-1)±0.1 SEM), and soil respiration, a measure for heterotrophic ecosystem respiration (28.6 Mg C ha(-1) yr(-1)±1.2 SEM). The missing estimates necessary to close the C balance are wood net primary productivity and autotrophic respiration.Twenty-two years after logging TAGC stocks were 28% lower compared to unlogged forest (128 Mg C ha(-1)±13.4 SEM); a combined weighted average mean reduction due to selective logging of -57.8 Mg C ha(-1) (with 95% CI -75.5 to -40.2). Based on the findings we conclude that selective logging decreased the dipterocarp stock by 55-66%. Silvicultural treatments may have the potential to accelerate the recovery of dipterocarp C stocks to pre-logging levels.

Abstract

Deforestation in the tropics is an important source of carbon C release to the atmosphere. To provide a sound scientific base for efforts taken to reduce emissions from deforestation and degradation (REDD+) good estimates of C stocks and fluxes are important. We present components of the C balance for selectively logged lowland tropical dipterocarp rainforest in the Malua Forest Reserve of Sabah, Malaysian Borneo. Total organic C in this area was 167.9 Mg C ha(-1)±3.8 (SD), including: Total aboveground (TAGC: 55%; 91.9 Mg C ha(-1)±2.9 SEM) and belowground carbon in trees (TBGC: 10%; 16.5 Mg C ha(-1)±0.5 SEM), deadwood (8%; 13.2 Mg C ha(-1)±3.5 SEM) and soil organic matter (SOM: 24%; 39.6 Mg C ha(-1)±0.9 SEM), understory vegetation (3%; 5.1 Mg C ha(-1)±1.7 SEM), standing litter (<1%; 0.7 Mg C ha(-1)±0.1 SEM) and fine root biomass (<1%; 0.9 Mg C ha(-1)±0.1 SEM). Fluxes included litterfall, a proxy for leaf net primary productivity (4.9 Mg C ha(-1) yr(-1)±0.1 SEM), and soil respiration, a measure for heterotrophic ecosystem respiration (28.6 Mg C ha(-1) yr(-1)±1.2 SEM). The missing estimates necessary to close the C balance are wood net primary productivity and autotrophic respiration.Twenty-two years after logging TAGC stocks were 28% lower compared to unlogged forest (128 Mg C ha(-1)±13.4 SEM); a combined weighted average mean reduction due to selective logging of -57.8 Mg C ha(-1) (with 95% CI -75.5 to -40.2). Based on the findings we conclude that selective logging decreased the dipterocarp stock by 55-66%. Silvicultural treatments may have the potential to accelerate the recovery of dipterocarp C stocks to pre-logging levels.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:January 2012
Deposited On:21 Jan 2012 17:15
Last Modified:21 Nov 2017 15:47
Publisher:Public Library of Science (PLoS)
ISSN:1932-6203
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.1371/journal.pone.0029642
PubMed ID:22235319

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