Are secondary forests second-rate? Comparing peatland greenhouse gas emissions, chemical and microbial community properties between primary and secondary forests in Peninsular Malaysia

Dhandapani, Selvakumar; Ritz, Karl; Evers, Stephanie; Yule, Catherine M.; Sjögersten, Sofie

doi:10.1016/j.scitotenv.2018.11.046

Cited by 34 publications

(72 citation statements)

References 77 publications

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“…As a consequence, we speculate that the significant relationships between redox potential and soil moisture and a variety of PLFA and GDGT biomarker abundances mean that seasonal changes in precipitation will influence on community structure in this ombrotrophic peatland, with potential consequences for GHG emissions. This has been previously demonstrated to be the case in temperate peatlands, with significant changes in microbial community structure with changes in water table depth (Zhong et al 2015), and has recently been reported in two tropical peatlands in Malaysia (Dhandapani et al 2019).…”

Section: Environmental Regulation Of Microbial Community Structuresupporting

confidence: 56%

“…Previous studies in tropical soils and peats have noted that microbial community structure and abundance can exhibit a tendency towards seasonality (Dhandapani et al 2019;Smith et al 2018). Tropical peatlands are subject to distinct wet and dry seasons which can exert a strong influence on water table height in particular, altering the balance between oxic and anoxic processes (Wright et al 2013b).…”

Section: Environmental Regulation Of Microbial Community Structurementioning

confidence: 99%

“…Differences in microbial community structure between seasons and primary and secondary swamp forest in Malaysia, assessed through changes in specific phospholipid fatty acid (PLFA) biomarkers, have also been reported. Components of the microbial community, Gram positive and Gram negative bacteria, have in turn been positively correlated with CO 2 and CH 4 emissions respectively (Dhandapani et al 2019). Assessing microbial community composition is therefore important in interpreting greenhouse gas dynamics within peatlands.…”

Section: Introductionmentioning

confidence: 99%

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Peat Properties, Dominant Vegetation Type and Microbial Community Structure in a Tropical Peatland

et al. 2020

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Tropical peatlands are an important carbon store and source of greenhouse gases, but the microbial component, particularly community structure, remains poorly understood. While microbial communities vary between tropical peatland land uses, and with biogeochemical gradients, it is unclear if their structure varies at smaller spatial scales as has been established for a variety of peat properties. We assessed the abundances of PLFAs and GDGTs, two membrane spanning lipid biomarkers in bacteria and fungi, and bacteria and archaea, respectively, to characterise peat microbial communities under two dominant and contrasting plant species, Campnosperma panamensis (a broadleaved evergreen tree), and Raphia taedigera (a canopy palm), in a Panamanian tropical peatland. The plant communities supported similar microbial communities dominated by Gram negative bacteria (38.9-39.8%), with smaller but significant fungal and archaeal communities. The abundance of specific microbial groups, as well as the ratio of caldarchaeol:crenarchaeol, isoGDGT: brGDGTs and fungi:bacteria were linearly related to gravimetric moisture content, redox potential, pH and organic matter content indicating their role in regulating microbial community structure. These results suggest that tropical peatlands can exhibit significant variability in microbial community abundance even at small spatial scales, driven by both peat botanical origin and localised differences in specific peat properties.

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Section: Environmental Regulation Of Microbial Community Structuresupporting

confidence: 56%

Section: Environmental Regulation Of Microbial Community Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Peat Properties, Dominant Vegetation Type and Microbial Community Structure in a Tropical Peatland

et al. 2020

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“…Gram-negative relative abundance positively correlated with volumetric moisture. Similar correlations were also reported by Dhandapani et al (2019b), where primary peat forest with above surface water table, was dominated by Gram-negative bacteria.…”

Section: Microbes Under Different Land-use Typessupporting

confidence: 88%

Land-Use Changes Associated with Oil Palm Plantations Impact PLFA Microbial Phenotypic Community Structure throughout the Depth of Tropical Peats

et al. 2020

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Tropical peatlands are complex and globally-important ecosystems that are increasingly threatened by anthropogenic disturbances, primarily via agricultural development. Microbes in peatlands play important roles in governing overall ecosystem functions and sustenance, with specific population dynamics governing carbon sink or source dynamics. We determined phenotypic microbial community structures under forest, drained, burned and oil palm plantation peatlands, using phospholipid fatty acid (PLFA) profiling. Communities were distinct under each land-use type, varied consistently with depth down to two metres, but with a distinct characteristic shift at circa one metre depth. There was bacterial dominance across all land-use types and depths. The burnt peatland showed the greatest contrast relative to forest, possibly due to the difference in water table level. Gram-positive bacteria was the most dominant group in surface layers under all land-use types except burnt, and their relative abundance decreased with depth, replaced by Gram-negative groups in deeper layers. Fungal relative abundance remained low across both land-use types and depth ranges. Our results shed light on a hitherto virtually unknown tropical peat microbial phenotypic community structure and indicate that anthropogenic disturbance in tropical peatlands severely alter microbial communities.

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“…The Malaysian oil palm and pineapple intercropping site is located in Selangor State, approximately 14 km from the west coast of Peninsular Malaysia (3°2 5 0 20.6 00 N, 101°19 0 56.6 00 E). The site is surrounded by recently planted (2014) 2nd generation oil palm mono-cropping and is drained by two drainage ditches along the borders at opposite sides of the site (Dhandapani et al 2019b). During sampling the site was not flooded, although the peat was moist, with high gravimetric moisture content.…”

Section: Study Sitesmentioning

confidence: 99%

Interactions between labile carbon, temperature and land use regulate carbon dioxide and methane production in tropical peat

et al. 2019

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Tropical peatlands are a significant carbon store and contribute to global carbon dioxide (CO 2) and methane (CH 4) emissions. Tropical peatlands are threatened by both land use and climate change, including the alteration of regional precipitation patterns, and the 3-4°C predicted warming by 2100. Plant communities in tropical peatlands can regulate greenhouse gas (GHG) fluxes through labile carbon inputs, but the extent to which these inputs regulate the temperature response of CO 2 and CH 4 production in tropical peat remains unclear. We conducted an anoxic incubation experiment using three peat types of contrasting botanical origin to assess how carbon addition affects the temperature response (Q 10) of CO 2 and CH 4 production. Peats from forested peatlands in Panama and Malaysia, and a converted oil palm and pineapple intercropping system in Malaysia, differed significantly in redox potential, total carbon and carbon: nitrogen ratio. The production of CO 2 and CH 4 varied significantly among peat types and increased with increasing temperature, with Q 10 s for both gases of 1.4. Carbon addition further increased gas fluxes, but did not influence the Q 10 for CO 2 or CH 4 production or significantly affect the Q 10 of either gas. These findings demonstrate that the production of CO 2 and CH 4 in tropical peat is sensitive to warming and varies among peat types, but that the effect of root inputs in altering Q 10 appears to be limited. Keywords Tropical peat Á Carbon dioxide Á Methane Á Root exudates Á Land use change Á Temperature sensitivity

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Are secondary forests second-rate? Comparing peatland greenhouse gas emissions, chemical and microbial community properties between primary and secondary forests in Peninsular Malaysia

Abstract: The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription.

Cited by 34 publications

References 77 publications

Peat Properties, Dominant Vegetation Type and Microbial Community Structure in a Tropical Peatland

Peat Properties, Dominant Vegetation Type and Microbial Community Structure in a Tropical Peatland

Land-Use Changes Associated with Oil Palm Plantations Impact PLFA Microbial Phenotypic Community Structure throughout the Depth of Tropical Peats

Interactions between labile carbon, temperature and land use regulate carbon dioxide and methane production in tropical peat

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