Linking soil respiration and water table depth in tropical peatlands with remotely sensed changes in water storage from the gravity recovery and climate experiment

Swails, Erin; Yang, Xi; Asefi, S.; Hergoualc'h, K.; Verchot, Louis V.; McRoberts, Ronald E.; Lawrence, Deborah

doi:10.1007/s11027-018-9822-z

Cited by 12 publications

(10 citation statements)

References 34 publications

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“…The relationships observed between WTD, soil temperature and R h were not unexpected, as this has previously been demonstrated in multiple studies (35). In some studies, this has been presented as a linear relationship with WTD (36)(37)(38) or soil temperature only (39). As water table depth measurements do not require technical equipment, the relationship observed here has the potential for wide use by a variety of stakeholders to evaluate and model the impacts of hydrological management within these systems for reduced carbon losses.…”

Section: Environmental Variablessupporting

confidence: 57%

Temporal Variability in Heterotrophic Carbon Dioxide Emissions From A Drained Tropical Peatland in Uganda

Farmer

Langan²,

Smith³

2022

Front. Soil Sci.

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Our study measured heterotrophic carbon dioxide (CO2) emissions in a drained peatland under potato cultivation in south-western Uganda. Soil carbon losses have not previously been reported for this land use, and our study set out to capture the range and temporal variation in emissions, as well as investigate relationships with key environmental variables. Soil chamber-based emission measurements were taken over five days at four points in time over the year to capture daily and monthly variability, including day and night sampling to capture any diurnal variations in temperatures and soil flux. Differences in soil microtopography from mounding of soils for potato beds and drainage trenches had a significant effect on the rate of soil flux. Diurnal sampling showed no significant difference in emissions or soil temperatures in the raised potato beds between day and night. More significant effects on soil flux from environmental drivers, such as water table depth, were observed between months, rather than hours and days. There were significant differences in the relationships between environmental variables and soil flux, depending on if soils had been recently disturbed or not. Area-weighted emissions based on microtopography gave a mean annual emissions factor of 98.79 ± 1.7 t CO2 ha-1 y-1 (± standard error) from this peatland use.

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Section: Environmental Variablessupporting

confidence: 57%

Temporal Variability in Heterotrophic Carbon Dioxide Emissions From A Drained Tropical Peatland in Uganda

Farmer

Langan²,

Smith³

2022

Front. Soil Sci.

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“…Ecosystem respiration (ER) under dried conditions is greater than in reference sites, while wetter sites have lower ER rates in boreal, temperate, and tropical peatlands over both short-term (Funk et al 1994;Oechel et al 1998;Bubier et al 2003;Blodau, Basiliko, and Moore 2004;Jauhiainen et al 2005;Strack et al 2006a;Riutta, Laine, and Tuittila 2007;Chivers et al 2009;Dinsmore et al 2009;Laine et al 2009;Sulman et al 2009;Cai, Flanagan, and Syed 2010;Lund et al 2012;Sulman et al 2012;Juszczak et al 2013;Wang et al 2014b;Pearson et al 2015;Chimner et al 2016;Samson et al 2018;Laine et al 2019b;Swails et al 2019b;Planas-Clarke et al 2020) and long-term water level alteration (Chimner and Cooper 2003a;Ballantyne et al 2014;Munir et al , 2015Kasimir et al 2018). See also Table 1.…”

Section: Effects Of Water Level Alteration On Co 2 Emissionsmentioning

confidence: 99%

Effects of water level alteration on carbon cycling in peatlands

Zhong

Jiang

Middleton

2020

Ecosyst Health Sustain

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Globally, peatlands play an important role in the carbon (C) cycle. High water level is a key factor in maintaining C storage in peatlands, but water levels are vulnerable to climate change and anthropogenic disturbance. This review examines literature related to the effects of water level alteration on C cycling in peatlands to summarize new ideas and uncertainties emerging in this field. Peatland ecosystems maintain their function by altering plant community structure to adapt to changing water levels. Regarding primary production, woody plants are more productive in unflooded, well-aerated conditions, while Sphagnum mosses are more productive in wetter conditions. The responses of sedges to water level alteration are species-specific. While peat decomposition is faster in unflooded, well aerated conditions, increased plant production may counteract the C loss induced by increased ecosystem respiration (ER) for a period of time. In contrast, rising water table maintains anaerobic conditions and enhances the role of the peatland as a C sink. Nevertheless, changes in DOC flux during water level fluctuation is complicated and depends on the interactions of flooding with environment. Notably, vegetation also plays a role in C flux but particular species vary in their ability to sequester and transport C. Bog ecosystems have a greater resilience to water level alteration than fens, due to differences in biogeochemical responses to hydrology. The full understanding of the role of peatlands in global C cycling deserves much more study due to uncertainties of vegetation feedbacks, peat-water interactions, microbial mediation of vegetation, wildfire, and functional responses after hydrologic restoration.

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“…Water level depth is determined by rainfall, evapotranspiration, and discharge, influencing soil moisture throughout the soil column and controlling, to some extent, soil respiration across tropical peatlands (Morris 2021). That also occurs in various types of land cover when the water level falls far below the surface soil and soil respiration increases, such as in oil palm and forest areas (Swails et al 2019).…”

Section: Co2 Emission In Small-holder Oil Palm On Peatlandmentioning

confidence: 99%

The partial contribution of CO2-emission losses from subsidence in small-holder oil palm plantation on a tropical peatland in West Kalimantan, Indonesia

Astiani

WIDIASTUTI²,

EKAMAWANTI³

et al. 2023

Biodiversitas

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Abstract. Astiani D, Widiastuti T, Ekamawanti HA, Ekyastuti W, Roslinda E, Mujiman. 2022. The partial contribution of CO2-emission losses from subsidence in small-holder oil palm plantation on a tropical peatland in West Kalimantan, Indonesia. Biodiversitas 23: 6539-6545. Carbon storage in tropical peat ecosystems over thousands of years, especially within peat soil, is in huge quantity. Degradation of peat ecosystems is generally caused by human factors, whether intentional or not, damaging the carbon storage function of tropical peatlands, where forest clearing, drainage development, and burning of land converted to agriculture and plantations result in significant greenhouse gas emissions. Tropical peat in the Kubu Raya District of West Kalimantan, which has a relatively large area of peat, has been degraded as a cause of uncontrolled drainage and land fires caused by a lack of management after its forest cover was lost. The main impact is an increase in peat CO2 emissions due to changes in land use, especially lowering groundwater levels. Subsequently, the subsidence process also occurs after land clearing. This study aims to obtain the proportion of carbon biomass loss due to the CO2 emission process from reducing the peat layer due to subsidence. Data collection was executed for two years, where CO2 emission was monitored bi-weekly, and the subsidence was measured bi-monthly. The results demonstrate groundwater levels dictate the peat CO2 emission and subsidence. Lowering GWL 30 to -85 cm increases CO2 by more than three times, approximately. The rate of peat subsidence shows similar trends to the emission. The proportion of peat biomass loss on CO2 emission was between 58.9 to 73.5%, except for GWL ~5 cm, where the proportion was the highest at 82%. The results of this study are beneficial in explaining the part of the subsidence that impacts the sources of CO2 emissions from the small-holder oil palm and GWL management on peatlands.

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Linking soil respiration and water table depth in tropical peatlands with remotely sensed changes in water storage from the gravity recovery and climate experiment

Cited by 12 publications

References 34 publications

Temporal Variability in Heterotrophic Carbon Dioxide Emissions From A Drained Tropical Peatland in Uganda

Temporal Variability in Heterotrophic Carbon Dioxide Emissions From A Drained Tropical Peatland in Uganda

Effects of water level alteration on carbon cycling in peatlands

The partial contribution of CO2-emission losses from subsidence in small-holder oil palm plantation on a tropical peatland in West Kalimantan, Indonesia

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