Effects of Land Use/Land Cover Changes on Carbon Storage in North African Coastal Wetlands

Journal of Marine Science and Engineering, Journal Year: 2022, Volume and Issue: 10(3), P. 364 - 364

Published: March 4, 2022

Healthy wetlands are among the most effective sinks for carbon on planet, and thus contribute to mitigate climate change. However, in North Africa, coastal under high pressure especially from urban sprawl tourism development, due rapid population growth migration. This paper analyzed effects of land use/land cover changes stocks, over 20 years, six African wetlands, estimated economic value sequestered during considered period. The methodology used combined remote sensing modeling. results showed that studied sites, only two (Moulouya Moulay Bouselham) an increase stored therefore potential sinks. In turn, other four a more or less significant loss carbon, which will likely be released into atmosphere. underlying processes drive dynamics mainly expansion use conversion, often occurs at expense natural habitats surrounding wetlands. Understanding these can provide valuable decision-making information planning, conservation reduction policies.

Language: Английский

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How can blue carbon burial in seagrass meadows increase long-term, net sequestration of carbon? A critical review

Environmental Research Letters, Journal Year: 2022, Volume and Issue: 17(9), P. 093004 - 093004

Published: Aug. 18, 2022

Abstract Blue carbon sequestration in seagrass meadows has been proposed as a low-risk, nature-based solution to offset emissions and reduce the effects of climate change. Although timescale burial is too short ancient fossil fuel carbon, it role play reaching net zero within modern cycle. This review documents discusses recent advances (from 2015 onwards) field blue carbon. The affected by species, meadow connectivity, sediment bioturbation, grainsize, energy local environment, calcium carbonate formation. rate organic can be calculated product accumulation below mixed layer concentration attributable seagrass. A combination biomarkers identify material more precisely than bulk isotopes alone. main threats related change are sea-level rise, leading shoreline squeeze, temperature particularly during extreme events such heat domes. In conclusion, some disagreement literature over methodology controls on likely results from real, regional differences seagrasses their habitat. Inter-regional collaboration could help resolve methodological provide robust understanding global meadows.

Language: Английский

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Rapid Site Selection to Prioritize Coastal Seascapes for Nature-Based Solutions With Multiple Benefits

Frontiers in Marine Science, Journal Year: 2022, Volume and Issue: 9

Published: April 29, 2022

Coastal seascapes are productive and diverse land-sea systems that provide many valuable benefits yet increasingly threatened by human activity. Scaling up of nature-based solutions (NbS) to effectively protect, sustainably manage, restore coastal is urgently required for mitigation climate change biodiversity loss while also providing socio-economic benefits. Evidence-based site selection an important first step improve the outcomes avoid negative impacts when prioritizing NbS investments at national level. We developed a spatially explicit, integrative culturally relevant ecosystem-based process identify portfolio consideration in United Arab Emirates (UAE). The primary goal was rank planning units based on potential action, positive impact people. multi-criteria site-selection framework provided rapid, transparent, repeatable scalable tool. highest weightings were assigned blue carbon storage value, conservation features, local stakeholder preferred areas. Spatial proxies people represented population density accessibility seascapes, relative tourism recreation potential, importance fish habitat fishing grounds food security. Participatory mapping knowledge review existing data ensured both qualitative quantitative criteria reliable, up-to-date locally relevant. Two distinct clusters high suitability identified Abu Dhabi region four along north-western coast UAE. Most sites located outside marine protected Alternative spatial scenarios without bias underscored through participatory highlighted additional priority future scaling-up NbS. A corridor medium across offers designing well-connected accelerate boost synergistic increase resilience. provides rapid tool integrates global open access range scales with great transferability other regions worldwide.

Language: Английский

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Carbon stocks and accumulation rates in Red Sea seagrass meadows

Scientific Reports, Journal Year: 2018, Volume and Issue: 8(1)

Published: Oct. 3, 2018

Abstract Seagrasses play an important role in climate change mitigation and adaptation, acting as natural CO 2 sinks buffering the impacts of rising sea level. However, global estimates organic carbon (C org ) stocks, accumulation rates seafloor elevation seagrasses are limited to a few regions, thus potentially biasing estimates. Here we assessed extent soil C stocks seagrass meadows ( Thalassia hemprichii , Enhalus acoroides Halophila stipulacea Thalassodendrum ciliatum Halodule uninervis from Saudi Arabia. We estimated that store 3.4 ± 0.3 kg m −2 1 m-thick deposits, accumulated at 6.8 1.7 g yr −1 over last 500 2,000 years. The extreme conditions Red Sea, such nutrient limitation reducing growth high temperature increasing respiration rates, may explain their relative low storage compared temperate meadows. Differences among habitats (i.e. location species composition) mainly related contribution detritus pool, fluxes adjacent mangrove tidal marsh ecosystems into meadows, amount fine sediment particles. sequester annually around 0.8% emissions fossil-fuels by Arabia, while level rise. This study contributes data understudied regions growing dataset on sequestration further evidences even small coastal areas.

Language: Английский

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High midday temperature stress has stronger effects on biomass than on photosynthesis: A mesocosm experiment on four tropical seagrass species

Ecology and Evolution, Journal Year: 2018, Volume and Issue: 8(9), P. 4508 - 4517

Published: April 10, 2018

Abstract The effect of repeated midday temperature stress on the photosynthetic performance and biomass production seagrass was studied in a mesocosm setup with four common tropical species, including Thalassia hemprichii , Cymodocea serrulata Enhalus acoroides Thalassodendron ciliatum . To mimic natural conditions during low tides, plants were exposed to spikes different maximal temperatures, that is, ambient (29–33°C), 34, 36, 40, 45°C, three hours for seven consecutive days. At temperatures up 36°C, all species could maintain full rates (measured as electron transport rate, ETR ) throughout experiment without displaying any obvious responses declining quantum yield, Fv/Fm). All except T. also withstand 40°C, only at 45°C did display significantly lower Fv/Fm. Biomass estimation, however, revealed pattern, where significant losses both above‐ belowground occurred 40 (except C. 40°C treatment). clearly higher shoots than root–rhizome complex. findings indicate that, although seagrasses presently can cope high stress, few degrees increase maximum daily cause productivity.

Language: Английский

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