Management driven changes in carbon mineralization dynamics of tropical peat

Jauhiainen, Jyrki; Silvennoinen, Hanna; Könönen, Mari; Limin, Suwido H.; Vasander, Harri

doi:10.1007/s10533-016-0222-8

Cited by 26 publications

(33 citation statements)

References 39 publications

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“…This is in line with Nilsson and Bohlin (1993), who found that more decomposed peat soils produced more CO 2 than less decomposed, more fibrous peat soils in temperate climate. In contrast, incubation studies by Jauhiainen et al (2016) and Swails et al (2017) showed that soils from degraded peatlands with secondary regrowth or cultivated with oil palm produced less CO 2 than soils from intact peat swamp forests. However, the degraded peatlands of Indonesia were drained and burnt, while sites in our study were not.…”

Section: Discussionmentioning

confidence: 89%

Greenhouse gas emissions along a peat swamp forest degradation gradient in the Peruvian Amazon: soil moisture and palm roots effects

Lent

Hergoualc’h

Verchot

et al. 2018

Mitig Adapt Strateg Glob Change

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Tropical peatlands in the Peruvian Amazon exhibit high densities of Mauritia flexuosa palms, which are often cut instead of being climbed for collecting their fruits. This is an important type of forest degradation in the region that could lead to changes in the structure and composition of the forest, quality and quantity of inputs to the peat, soil properties, and greenhouse gas (GHG) fluxes. We studied peat and litterfall characteristics along a forest degradation gradient that included an intact site, a moderately degraded site, and a heavily degraded site. To understand underlying factors driving GHG emissions, we examined the response of in vitro soil microbial GHG emissions to soil moisture variation, and we tested the potential of pneumatophores to conduct GHGs in situ. The soil phosphorus and carbon content and carbon-to-nitrogen ratio as well as the litterfall nitrogen content and carbon-to-nitrogen ratio were significantly affected by forest degradation. Soils from the degraded sites consistently produced more carbon dioxide (CO 2 ) than soils from the intact site during in vitro incubations. The response of CO 2 production to changes in water-filled pore space (WFPS) followed a cubic polynomial relationship with maxima at 60-70% at the three sites. Methane (CH 4 ) was produced in limited amounts and exclusively under watersaturated conditions. There was no significant response of nitrous oxide (N 2 O) emissions to WFPS variation. Lastly, the density of pneumatophore decreased drastically as the result of forest degradation and was positively correlated to in situ CH 4 emissions. We conclude that CIAT, Cali, Colombia recurrent M. flexuosa harvesting could result in a significant increase of in situ CO 2 fluxes and a simultaneous decrease in CH 4 emissions via pneumatophores. These changes might alter long-term carbon and GHG balances of the peat, and the role of these ecosystems for climate change mitigation, which stresses the need for their protection.

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Section: Discussionmentioning

confidence: 89%

Greenhouse gas emissions along a peat swamp forest degradation gradient in the Peruvian Amazon: soil moisture and palm roots effects

Lent

Hergoualc’h

Verchot

et al. 2018

Mitig Adapt Strateg Glob Change

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“…then setting q equal to the measured average flux for the day, and solving for k assuming an effective oxygen diffusion coefficient of 0.5 m 2 /day, the coefficient in air (1.5 m 2 /day) reduced by a tortuosity of 3(Cussler, 1997;Gharedaghloo, Price, Rezanezhad, & Quinton, 2018;Rezanezhad et al, 2010). These k values were compared to decomposition rates derived from incubation experiments (e.g Jauhiainen, Silvennoinen, Könönen, Limin, & Vasander, 2016). These k values were compared to decomposition rates derived from incubation experiments (e.g Jauhiainen, Silvennoinen, Könönen, Limin, & Vasander, 2016).…”

mentioning

confidence: 99%

CO₂ emissions from an undrained tropical peatland: Interacting influences of temperature, shading and water table depth

Hoyt

Gandois

Eri³

et al. 2019

Global Change Biology

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Emission of CO2 from tropical peatlands is an important component of the global carbon budget. Over days to months, these fluxes are largely controlled by water table depth. However, the diurnal cycle is less well understood, in part, because most measurements have been collected daily at midday. We used an automated chamber system to make hourly measurements of peat surface CO2 emissions from chambers root‐cut to 30 cm. We then used these data to disentangle the relationship between temperature, water table and heterotrophic respiration (Rhet). We made two central observations. First, we found strong diurnal cycles in CO2 flux and near‐surface peat temperature (<10 cm depth), both peaking at midday. The magnitude of diurnal oscillations was strongly influenced by shading and water table depth, highlighting the limitations of relying on daytime measurements and/or a single correction factor to remove daytime bias in flux measurements. Second, we found mean daily Rhet had a strong linear relationship to the depth of the water table, and under flooded conditions, Rhet was small and constant. We used this relationship between Rhet and water table depth to estimate carbon export from both Rhet and dissolved organic carbon over the course of a year based on water table records. Rhet dominates annual carbon export, demonstrating the potential for peatland drainage to increase regional CO2 emissions. Finally, we discuss an apparent incompatibility between hourly and daily average observations of CO2 flux, water table and temperature: water table and daily average flux data suggest that CO2 is produced across the entire unsaturated peat profile, whereas temperature and hourly flux data appear to suggest that CO2 fluxes are controlled by very near surface peat. We explore how temperature‐, moisture‐ and gas transport‐related mechanisms could cause mean CO2 emissions to increase linearly with water table depth and also have a large diurnal cycle.

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“…However, as a side effect, the breakdown of recalcitrant compounds may accelerate as a result of increased availability of decompositionlimiting nutrients or labile carbohydrates. This has been observed in ex situ studies by the addition of N together with labile glutamate and glucose (Jauhiainen et al 2016b), and in situ by the addition of N-fertilizer and urine , Comeau et al 2016 to peat from intensively managed land-use types. Similarly, the relatively high enzyme activities ob s e rve d at t he to pmo s t pe a t o f t he ag ric ul tu ral s ite (III), is likely due to triggered decomposition caused by urine and burned plant residues used as fertilizers.…”

Section: Implications Of Findings To Management Of Peatlandsmentioning

confidence: 74%

“…Nutrient availability may also regulate decomposition processes, and nitrogen (N) and phosphorus (P) in particular are thought to be the limiting nutrients for decomposition and growth in tropical organic oils (Rejmankova 2001;Sjögersten et al 2011;Jauhiainen et al 2016b). Therefore, productive cultivation of cropping plants on these naturally poor soils requires fertilization (Andriesse 1988).…”

Section: Peat Formation and Decomposition And The Effects Of Land-usementioning

confidence: 99%

“…Productive cultivation at degraded soils requires fertilization and reforestation increases litter input. Both added fertilizers or new litter with higher concentrations of labile carbohydrates to degraded peat soil, may trigger decomposition processes, as suggested by Comeau et al (2016) and Jauhiainen et al (2016b), yet the effects of reforestation to decomposition processes has not been studied. Understanding the current properties and decomposability of peat is crucial for predicting the effects of future management on C stored in peat in Southeast Asia and for planning C neutral management in Asia.…”

Section: Peat Formation and Decomposition And The Effects Of Land-usementioning

confidence: 99%

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Management driven changes in carbon mineralization dynamics of tropical peat

Cited by 26 publications

References 39 publications

Greenhouse gas emissions along a peat swamp forest degradation gradient in the Peruvian Amazon: soil moisture and palm roots effects

Greenhouse gas emissions along a peat swamp forest degradation gradient in the Peruvian Amazon: soil moisture and palm roots effects

CO₂ emissions from an undrained tropical peatland: Interacting influences of temperature, shading and water table depth

Tropical peat decomposability expressed through physical, chemical and biological properties under varying land management intensities

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Management driven changes in carbon mineralization dynamics of tropical peat

Cited by 26 publications

References 39 publications

Greenhouse gas emissions along a peat swamp forest degradation gradient in the Peruvian Amazon: soil moisture and palm roots effects

Greenhouse gas emissions along a peat swamp forest degradation gradient in the Peruvian Amazon: soil moisture and palm roots effects

CO2 emissions from an undrained tropical peatland: Interacting influences of temperature, shading and water table depth

Tropical peat decomposability expressed through physical, chemical and biological properties under varying land management intensities

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CO₂ emissions from an undrained tropical peatland: Interacting influences of temperature, shading and water table depth