Impact of deforestation on solid and dissolved organic matter characteristics of tropical peat forests: implications for carbon release

Gandois, Laure; Cobb, Ale×ander R.; Hei, I. Chieng; Lim, Linda B.L.; Salim, Kamariah Abu; Harvey, Charles F.

doi:10.1007/s10533-012-9799-8

Cited by 61 publications

(62 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DOC concentrations of 5661 µM measured in a channel draining pristine peat soils in Borneo (Moore et al, 2013) fall within the range of DOC pore water concentrations (Gandois et al, 2013), suggesting that DOC decomposition is of minor importance under natural conditions, as expected from the refractory characteristics of leaf litter of endemic peat plants. Under such a circumstance, the DOC yield obtained from the pristine river in Borneo of 62 g C m −2 yr −1 can be considered as the lowest estimate on DOC leaching.…”

Section: Anthropogenic Perturbationsmentioning

confidence: 61%

“…In the Siak catchment the lower groundwater DOC concentrations of about 5333 µM (Table S3) fall in the range of DOC concentrations measured in other peat soils (5183-6658 µM; Gandois et al, 2013). DOC groundwater concentrations of up to 16,222 µM are extremely high but can be caused by leaching of leaf litter produced by secondary forest plants within a couple of days (Yule and Gomez, 2009).…”

Section: Leachingmentioning

confidence: 71%

“…In DOC pore water profiles, such a reduced leaching is reflected in the absence of a pronounced DOC gradient (Gandois et al, 2013). DOC pore water profiles in soils with secondary vegetation are expected to show a strong gradient with higher (Table 1).…”

Section: Leachingmentioning

confidence: 99%

See 2 more Smart Citations

Carbon Leaching from Tropical Peat Soils and Consequences for Carbon Balances

2016

View full text Add to dashboard Cite

Drainage and deforestation turned Southeast (SE) Asian peat soils into a globally important CO 2 source, because both processes accelerate peat decomposition. Carbon losses through soil leaching have so far not been quantified and the underlying processes have hardly been studied. In this study, we use results derived from nine expeditions to six Sumatran rivers and a mixing model to determine leaching processes in tropical peat soils, which are heavily disturbed by drainage and deforestation. Here we show that a reduced evapotranspiration and the resulting increased freshwater discharge in addition to the supply of labile leaf litter produced by re-growing secondary forests increase leaching of carbon by ∼200%. Enhanced freshwater fluxes and leaching of labile leaf litter from secondary vegetation appear to contribute 38 and 62% to the total increase, respectively. Decomposition of leached labile DOC can lead to hypoxic conditions in rivers draining disturbed peatlands. Leaching of the more refractory DOC from peat is an irrecoverable loss of soil that threatens the stability of peat-fringed coasts in SE Asia.

show abstract

Section: Anthropogenic Perturbationsmentioning

confidence: 61%

Section: Leachingmentioning

confidence: 71%

See 1 more Smart Citation

Carbon Leaching from Tropical Peat Soils and Consequences for Carbon Balances

2016

View full text Add to dashboard Cite

show abstract

“…Despite high hydraulic conductivity, undrained peat domes may release most of their excess rainfall through runoff and overland flow, rather than groundwater pathways (Kelly et al 2013); this situation changes upon drainage, with potential consequences for an increased export of soluble organic compounds (Gandois et al 2013). In the overall carbon budget, however, this represents only a small term (Hergoualc'h and Verchot 2013).…”

Section: A21 Quantificationmentioning

confidence: 99%

Mud, muddle and models in the knowledge value-chain to action on tropical peatland conservation

Noordwijk

Matthews

Agus³

et al. 2014

Mitig Adapt Strateg Glob Change

View full text Add to dashboard Cite

Tropical peatlands are known not only for their high, area-based, carbon emissions in response to land-use change but also as hot spots of debate about associated data uncertainties. Perspectives are still evolving on factors underlying the variability and uncertainty. Debate includes the ways of reducing emissions through rewetting, reforestation and agroforestry. A knowledge value-chain that is long and complex links (a) fundamental understanding of peat and peatland processes leading to sciencebased quantification and default values, (b) willingness and (c) ability to act towards emission reduction, and ultimately (d) to local, national and global actions that effectively provide rules, incentives and motivation to conserve peat and reduce emissions. We discuss this value chain, its stakeholders and issues that still remain partially unresolved. We conclude that, to shorten the denial and conspiracy-theory stages of debate that otherwise slow down steps B and C, networks of international and national scientists have to be involved at the early stage of identifying policysensitive environmental issues. Models span part of the knowledge value-chain but transition of analysis units requires specific attention, from soil volumes through area and commodity flows to Strateg Glob Change (2014) 19:887-905 opportunities for reductions. While drainage of peatlands triggers landscape-scale increases in emissions, factors beyond drainage depth, including nutrient supply, may have a major influence on decomposition rates. Attempts to disentangle the contributions of plant and peat-based respiration in surface flux measurements involve assumptions that cannot be easily verified in comparisons between land uses. With progress on A leading to new internationally accepted defaults and with resistance on step B reduced, the reality of C and lack of working solutions for D is currently constraining further progress.

show abstract

“…The removal of peat forest vegetation creates large canopy gaps leading to increased solar radiation input intensity, decreased peat moisture and increased evaporation, and therefore, the peat surface temperature will increase Gandois et al, 2013;Graham & Page, 2014;Page & Hooijer, 2014;). In turn, the higher temperature affects peat moisture content, evapotranspiration, peat carbon dynamics, and the hydrological balance Dommain et al, 2011).…”

Section: 311! Change Of Peat Physical Properties and Topographicamentioning

confidence: 99%

An assessment of the restoration efforts of degraded peatland in central Kalimantan, Indonesia

Dohong¹

View full text Add to dashboard Cite

Indonesia's tropical peatlands are an ecosystem of global significance. They contain immense stores of carbon and play a key role in regional and global climate systems. They provide habitat for iconic species such as the orangutan and Sumatran tiger, and they sustain the livelihoods of thousands of local people. Despite these values, Indonesia's peatland ecosystems have been subject to extensive deforestation and degradation during the past two decades. Recurrent peatland fires related to these land use activities have caused smoke pollution across the region, resulting in substantial public health issues and political controversy. More than 50% of the nation's 21 Mha of peatland can be considered as degraded. There is an urgent need to slow the rate of peatland degradation in Indonesia and to effectively restore the vast areas already damaged. A key consideration in this challenge is that tropical peatland restoration is an emerging field of scientific inquiry and little research has been published on the factors that constitute and influence successful restoration of tropical peatland ecosystems.This thesis addresses this gap in the broader ecosystem restoration literature by focusing on a case study of the so-called "Ex-Mega Rice Project" area of Central Kalimantan (an area previously subject to extensive degradation) and examining how successful peatland restoration can be achieved in Indonesia by: (1) reviewing the drivers of peatland degradation in the country in order to better understand the competing interests and broader socioecological context in which restoration activities need to be carried out; (2) studying previous restoration initiatives in Indonesia to better understand the restoration techniques used and the factors influencing their relative effectiveness; (3) analysing the specific tropical peatland restoration technique of "re-wetting" to better understand which elements of the technique best support effective restoration outcomes; (4) analysing the specific issue of illegal oil palm development on Indonesian peatland, including a consideration of what sorts of interventions are required to halt illegal oil palm development and control the associated recurrent fires that have been shown to substantially constrain the effectiveness of restoration initiatives; and (5) presenting an overarching conceptual framework of the factors that influence effective peatland restoration, which can be used by policy makers to devise restoration interventions that should have a greater probability of success.The drivers of peatland degradation in Indonesia can be categorised as direct and indirect. Direct drivers include logging, oil palm development and recurrent fires (mostly caused by large-and smallscale land use activities). Indirect drivers include climate change, the poverty and employment needs ii of local people, and the ineffective and sometimes perversely counter-productive land use governance systems.Techniques previously used to restore peatlands in Indonesia include rewetting through ...

show abstract

Impact of deforestation on solid and dissolved organic matter characteristics of tropical peat forests: implications for carbon release

Cited by 61 publications

References 57 publications

Carbon Leaching from Tropical Peat Soils and Consequences for Carbon Balances

Carbon Leaching from Tropical Peat Soils and Consequences for Carbon Balances

Mud, muddle and models in the knowledge value-chain to action on tropical peatland conservation

An assessment of the restoration efforts of degraded peatland in central Kalimantan, Indonesia

Contact Info

Product

Resources

About