Is peat accumulation in mangrove swamps influenced by the “enzymic latch” mechanism?

Saraswati, Saraswati; Dunn, Christian; Mitsch, William J.; Freeman, Chris

doi:10.1007/s11273-016-9493-z

Cited by 21 publications

(32 citation statements)

References 36 publications

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“…Although the phenolic compounds (e.g. tannins) found in mangrove leaf litter may inhibit microbial activity, due to the effect of the 'enzymic latch', (Freeman et al, 2001;Freeman et al, 2004;Saraswati et al, 2016), it is unlikely to inhibit all activity prior to leaching as labile carbon is still available in the fresh litter. This is utilized by microorganisms to produce exoenzymes (Keuskamp et al, 2015).…”

Section: Leachingmentioning

confidence: 99%

“…Rates of OM accumulation in mangrove ecosystems are not entirely determined by phenolic compound concentration. Saraswati et al (2016) conducted a study to assess whether the 'enzymic latch', that is responsible for the accumulation of carbon stores in peatlands (Freeman et al 2001;Freeman et al, 2004) is present in mangrove ecosystems. The 'enzymic latch' is the inhibition of phenol oxidase activity, the enzyme responsible for the decomposition of phenolic compounds, through the build-up of phenolics as a result of anaerobic conditions in the soil (Freeman et al, 2001).…”

Section: The Role Of Microbial Activity In Sedimentary Decompositionmentioning

confidence: 99%

“…The 'enzymic latch' is the inhibition of phenol oxidase activity, the enzyme responsible for the decomposition of phenolic compounds, through the build-up of phenolics as a result of anaerobic conditions in the soil (Freeman et al, 2001). Saraswati et al (2016) identified that the 'enzymic latch' likely causes the accumulation of peat in red mangroves (Rhizophora mangle) as identified by the lower hydrolase enzyme activity in anaerobic conditions (phosphatase: -44%; βglucosidase: -14%; and glucosaminidase: -11%) when compared to aerobic conditions; which could possibly explain the accumulation of peat in all mangroves. However, because red mangroves have been identified as having higher tannin concentrations in their litter (Ashton et al, 1999), it is possible that the 'enzymic latch' may not occur in mangroves with litter containing lower phenolic concentrations.…”

Section: The Role Of Microbial Activity In Sedimentary Decompositionmentioning

confidence: 99%

“…However, because red mangroves have been identified as having higher tannin concentrations in their litter (Ashton et al, 1999), it is possible that the 'enzymic latch' may not occur in mangroves with litter containing lower phenolic concentrations. Saraswati et al (2016) refer to the potential for an ecoengineering approach involving supplementing mangrove systems with phenolic-rich substances to inhibit degradation, following the technique suggested by Freeman et al (2012) for peatland environments.…”

Section: The Role Of Microbial Activity In Sedimentary Decompositionmentioning

confidence: 99%

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Decomposition as a regulator of carbon accretion in mangroves: a review

Friesen

Dunn

Freeman

2018

Ecological Engineering

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The production and decomposition of litter in mangroves plays a significant role in the nutrient and organic carbon cycles. These can be highly variable both spatially and temporally as a result of numerous factors including tidal range, forest type, abundance and type of herbivorous fauna, temperature, and microbial activity. Mangroves also play an important role in blue carbon sequestration, with their status as carbon sinks crucial in mitigating against greenhouse gas-induced climate change. Blue carbon is a term used to describe the carbon captured by oceans and coastal ecosystems. We review and discuss the current available knowledge regarding sources of organic matter (OM) in mangroves as well as the roles of benthic macrofauna, water and microbial activity in the decomposition of OM in order to gain a better understanding of the decompositional processes that take place. Macrofauna break down and bury litter, thereby improving litter quality, in turn increasing decomposition rates via leaching and microbial activity. Microbial decomposition in mangroves is slow as a result of phenolic concentrations in the litter. A buildup of phenolic compounds inhibits microbial activity leading to the accumulation of OM in mangroves. Although knowledge has improved, there are still gaps in the information available and we still have an incomplete picture of the decompositional process in mangroves, and in particular the formation of blue carbon stores, necessitating further research.

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Section: Leachingmentioning

confidence: 99%

Section: The Role Of Microbial Activity In Sedimentary Decompositionmentioning

confidence: 99%

Section: The Role Of Microbial Activity In Sedimentary Decompositionmentioning

confidence: 99%

Section: The Role Of Microbial Activity In Sedimentary Decompositionmentioning

confidence: 99%

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Decomposition as a regulator of carbon accretion in mangroves: a review

Friesen

Dunn

Freeman

2018

Ecological Engineering

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“…High water and organic matter contents in wetland soils indicates a low microbial activity which encourages huge storage of SOM as well as high storage of GHGs over the years. This occurs usually as a result of the anoxic condition in such ecosystems due to low oxygen availability, thereby reducing decomposition and encouraging massive carbon deposit as well enhancing burial of GHGs (Foster et al, 2012, Saraswati et al, 2016. Soils from site A (Gada biyu) had the lowest Phenol oxidase enzyme activity (1536.56 nmoldicq g-1 h-1 ) this was followed by site B (Pwomol) which had slightly more than two-fold activity (3397.31nmoldicq g-1 h-1 ) while site B had a statistically significantly higher phenol oxidase activity (5340.44nmoldicq g-1 h-1 ) (p<0.05) in comparison with the other two sites (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

Examining the Process of Decomposition and Carbon Cycling in 'Fadama' Coastal Wetlands: A Case Study of Heaping Wetlands Ecosystem

Shwamyil¹,

Danjuma²,

Chundusu³

2020

FJS

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Wetlands provide several ecosystem services including carbon capture and storage, water filtration, nutrient cycling, and support agriculture among others. The biogeochemical process and decomposition parameters in ‘Fadama' wetland soils comprising of Gada biyu, Pwomol and Kpang referred to as sites A, B, and C respectively all of Heipang District in Barkin Ladi, Plateau State was investigated using standard operating procedures (SOP). Results of investigations revealed that soils from Kpang had slightly higher water content (34.52%) than those from Pwomol (33.48%) and Gada biyu (32.03%). While soils from Gada biyu had the highest solid organic matter (SOM) (10.79%) followed by Pwomol (8.15%) as Kpang had the least (7.85%). Gada biyu soils had the lowest Phenol oxidases activity (1536.56 nmol dicq g-1 h-1) while those from Pwomol (5340.44 nmol dicq g-1 h-1) was highest. All sites had similar concentrations of soil phenolics (76.58 µg g-1, 79.98µg g-1, and 83.25µg g-1). The activity of hydrolyses (β-glucosidase) in Gada biyu soil (2.93 nmol g-1 min-1) was lower than those from Pwomol (6.13 nmol g-1 min-1). These parameters indicate the level of biogeochemical processes in the soil at each site. Gada biyu had the highest rate of CH4 (0.84 ug g-1h-1) flux. Decomposition of organic matter, carbon cycling and greenhouse gas storage in wetland soil, is due to the anoxic condition comprising of low oxygen availability, cool temperatures, anaerobic conditions, reduced microbial activity, and the quality of organic matter substrates in such soils. Anthropogenic disturbances affecting wetlands must be discouraged to promote vital ecosystem services.

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Mangrove Forests

Alongi

2018

SpringerBriefs in Climate Studies

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Is peat accumulation in mangrove swamps influenced by the “enzymic latch” mechanism?

Cited by 21 publications

References 36 publications

Decomposition as a regulator of carbon accretion in mangroves: a review

Decomposition as a regulator of carbon accretion in mangroves: a review

Examining the Process of Decomposition and Carbon Cycling in 'Fadama' Coastal Wetlands: A Case Study of Heaping Wetlands Ecosystem

Mangrove Forests

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