Litter Inputs, but Not Litter Diversity, Maintain Soil Processes in Degraded Tropical Forests—A Cross-Continental Comparison

Kerdraon, Deirdre; Drewer, Julia; Chung, Arthur Y. C.; Majalap, Noreen; Slade, Eleanor M.; Bréchet, Laëtitia; Wallwork, Abby; Castro-Trujillo, Biancolini; Sayer, Emma J.

doi:10.3389/ffgc.2019.00090

Cited by 24 publications

(13 citation statements)

References 85 publications

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“…were higher from forest than OP (Kerdraon et al, 2020). This was also the general trend in our study despite the high variability of all measured fluxes.…”

Section: Discussionsupporting

confidence: 88%

“…However, we did not see the seasonal cycle reported in Hassler et al, (2015) from Indonesia and generally differences between all three land-uses (logged forest, oil palm and riparian) were small. The lack of seasonal variability seen in our study might be due to the fact that dry and wet seasons are not as pronounced in Sabah as in other tropical regions (Kerdraon et al, 2020) and that temperature is fairly constant throughout the year.…”

Section: Discussioncontrasting

confidence: 66%

“…Litter input in our plots was larger in the logged forest plots and riparian reserve than the OP. In litter decomposition experiments, in both Borneo and Panama, litter input was more important than litter type, which stresses the importance of the amount of aboveground litter for soil processes in general, especially in disturbed habitats or forest converted to plantations (Kerdraon et al, 2020).…”

Section: Discussionmentioning

confidence: 90%

“…Plantation management, for example returning palm fronds and empty fruit bunches to the plantation soil, will likely change nutrient cycling (Pardon et al, 2017) and therefore microbial composition. Presence of, for example, leaf litter as a source of organic matter is essential to maintain soil processes (Kerdraon et al, 2020). It is vital to understand underlying longer-term processes that ultimately might regulate GHG fluxes to be able to develop GHG mitigation strategies.…”

Section: Discussionmentioning

confidence: 99%

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Comparison of greenhouse gas fluxes and microbial communities from tropical forest and adjacent oil palm plantations on mineral soil

Drewer¹,

Leduning²,

Griffiths³

et al. 2020

Preprint

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Abstract. In Southeast Asia, oil palm plantations have largely replaced tropical forests. The impact of this shift in land-use on greenhouse gas (GHG) fluxes and soil microbial communities remains highly uncertain, mainly due to a relatively small pool of available data. The aim of this study is to quantify differences of nitrous oxide (N2O) and methane (CH4) fluxes as well as soil carbon dioxide (CO2) respiration rates from logged forests, oil palm plantations of different ages and an adjacent small riparian area. The focus of this study is on N2O fluxes, as these emissions are expected to increase significantly due to the introduction of nitrogen (N) fertiliser application. This study was conducted in the SAFE (Stability of Altered Forest Ecosystems) landscape in Malaysian Borneo (Sabah) with measurements every two months over a two-year period. GHG fluxes were measured by static chambers; at the same time soil samples were collected for analysis of the key soil physicochemical parameters and for analysis of microbial biodiversity using next generation sequencing in dry and wet season. N2O fluxes were highly variable across the different sites, with the highest mean flux from OP (46.2 ± 166 µg m−2 h−1 N2O-N) and riparian (31.8 ± 220 µg m−2 h−1 N2O-N) sites, compared to lower fluxes from logged forest (13.9 ± 171 µg m−2 h−1 N2O-N). Methane fluxes were generally small; −2.6 ± 17.2 µg CH4-C m−2 h−1 for OP and 1.3 ± 12.6 µg CH4-C m−2 h−1 for riparian with the range of measured CH4 fluxes largest in logged forests (2.2 ± 48.3 µg CH4- m−2 h−1). Soil respiration rates were larger from riparian areas (157.7 ± 106 mg m−2 h−1 CO2-C) and logged forests (137.4 ± 95 mg m−2 h−1 CO2-C) than OP plantations (93.3 ± 70 mg m−2 h−1 CO2-C) due to larger amounts of decomposing leaf litter. Microbial communities were distinctly different between the different land-use types and sites, bacterial communities linked to soil pH and fungal and eukaryotic communities to land-use. Despite measuring a number of environmental parameters, mixed models could only explain up to 17 % of the variance of measured fluxes for N2O, 3 % of CH4 and 25 % of soil respiration. Scaling up measured N2O fluxes to Sabah using land areas for forest and OP resulted in emissions increasing from 7.6 Mt (95 % confidence interval, −3.0–22.3 Mt) per year in 1973 to 11.4 Mt (0.2–28.6 Mt) per year in 2015 due to the increasing area of forest converted to OP plantations over the last ~40 years.

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“…were higher from forest than OP (Kerdraon et al, 2020). This was also the general trend in our study despite the high variability of all measured fluxes.…”

Section: Discussionsupporting

confidence: 88%

Section: Discussioncontrasting

confidence: 66%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Comparison of greenhouse gas fluxes and microbial communities from tropical forest and adjacent oil palm plantations on mineral soil

Drewer¹,

Leduning²,

Griffiths³

et al. 2020

Preprint

Self Cite

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“…Thus the practice of this less severe drainage in intercropping systems has the potential to mitigate some of the longer-term impacts (Dhandapani et al, 2019a). Whereas, owing to possible increased peat subsidence and the reduced, homogenous and easily degradable C input to soil from monocropping (Guillaume et al, 2016;Kerdraon et al, 2020), organic matter content in the second generation oil palm intercropping was ∼54%, which does not meet the required 65% defined by the regional government organizations and followed by the Roundtable on Sustainable Palm Oil (RSPO) (Firdaus et al, 2010;RSPO, 2019). It also barely passes some other published definitions that describe 45% organic content requirement for tropical peatlands (Osaki et al, 2016).…”

Section: Impacts Of Oil Palm On Peat Properties-amelioration Of Peat mentioning

confidence: 99%

Is Intercropping an Environmentally-Wise Alternative to Established Oil Palm Monoculture in Tropical Peatlands?

Dhandapani¹,

Girkin²,

Evers³

et al. 2020

Front. For. Glob. Change

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Tropical peatlands in Southeast Asia are important ecosystems that play a crucial role in global biogeochemical cycles, with a potential for strong climate feedback loops. The degradation of tropical peatlands due to the expansion of oil palm plantations and their impact on biodiversity and the carbon balance is a global concern. The majority of conversion of Southeast Asian peatlands to agriculture has been by smallholder oil palm farmers, who follow more varied cropping systems compared to industrial plantations, and have better scope for expansion of other alternative varied cropping systems if supported and encouraged. Using previously-published data on peat physicochemical properties, biodiversity and greenhouse gas emissions from smallholder oil palm plantations, we determined that prolonged oil palm monocropping for two generations would result in loss of carbon and peat functional properties that may lead to potential declassification of peatlands. We propose intercropping during the early stages of oil palm as a wise alternative for already-existing plantations in tropical peatlands to ameliorate some of the negative environmental impacts of oil palm on the physio-chemical properties of peat. However, we emphasize the need to more fully explore the sustainability of intercropping systems throughout the life cycle of palm plantations on peatlands, and integrate with current management practices. We also emphasize the further need for research to fully assess the impacts of oil palm intercropping compared to widelypracticed oil palm monocropping. Finally, we suggest changes in government certification policies to encourage intercropping practices by smallholders.

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Distinct changes in soil organic matter quality, quantity and biochemical composition in response to land-use change to diverse cropping systems and agroforestry in north-western India

Sharma,

Kaur,

Singh

et al. 2024

Agroforest Syst

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Litter Inputs, but Not Litter Diversity, Maintain Soil Processes in Degraded Tropical Forests—A Cross-Continental Comparison

Cited by 24 publications

References 85 publications

Comparison of greenhouse gas fluxes and microbial communities from tropical forest and adjacent oil palm plantations on mineral soil

Comparison of greenhouse gas fluxes and microbial communities from tropical forest and adjacent oil palm plantations on mineral soil

Is Intercropping an Environmentally-Wise Alternative to Established Oil Palm Monoculture in Tropical Peatlands?

Distinct changes in soil organic matter quality, quantity and biochemical composition in response to land-use change to diverse cropping systems and agroforestry in north-western India

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