Land use changes affecting soil organic carbon storage along a mangrove swamp rice chronosequence in the Cacheu and Oio regions (northern Guinea-Bissau)

Andreetta, Anna; Huertas, António Delgado; Lotti, Matteo; Cerise, Streng

doi:10.1016/j.agee.2015.10.017

Cited by 42 publications

(33 citation statements)

References 67 publications

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“…Conversion of mangrove forest to shrimp ponds results in a rapid and near complete loss of carbon in the upper meter of soil (Kauffman et al 2014), as well as losses deeper in the soil profile (Kauffman et al 2017). Conversion to other agricultural uses such as pasture for beef production (Kauffman et al 2016b) and cereal crops (Andreetta et al 2016) also appear to result in large soil carbon emissions. However, mangrove degradation and loss due to over harvesting for fuelwood (Jones et al 2015) or due to natural disturbance likely leads to more moderate emissions as decomposition and erosion exceed new plant carbon inputs.…”

Section: Soil Carbon Loss Due To Land Conversion (2000-2015)mentioning

confidence: 99%

A global map of mangrove forest soil carbon at 30 m spatial resolution

Sanderman

Hengl

Fiske

et al. 2018

Environ. Res. Lett.

296

191

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With the growing recognition that effective action on climate change will require a combination of emissions reductions and carbon sequestration, protecting, enhancing and restoring natural carbon sinks have become political priorities. Mangrove forests are considered some of the most carbon-dense ecosystems in the world with most of the carbon stored in the soil. In order for mangrove forests to be included in climate mitigation efforts, knowledge of the spatial distribution of mangrove soil carbon stocks are critical. Current global estimates do not capture enough of the finer scale variability that would be required to inform local decisions on siting protection and restoration projects. To close this knowledge gap, we have compiled a large georeferenced database of mangrove soil carbon measurements and developed a novel machine-learning based statistical model of the distribution of carbon density using spatially comprehensive data at a 30 m resolution. This model, which included a prior estimate of soil carbon from the global SoilGrids 250 m model, was able to capture 63% of the vertical and horizontal variability in soil organic carbon density (RMSE of 10.9 kg m −3 ). Of the local variables, total suspended sediment load and Landsat imagery were the most important variable explaining soil carbon density. Projecting this model across the global mangrove forest distribution for the year 2000 yielded an estimate of 6.4 Pg C for the top meter of soil with an 86-729 Mg C ha −1 range across all pixels. By utilizing remotely-sensed mangrove forest cover change data, loss of soil carbon due to mangrove habitat loss between 2000 and 2015 was 30-122 Tg C with >75% of this loss attributable to Indonesia, Malaysia and Myanmar. The resulting map products

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Section: Soil Carbon Loss Due To Land Conversion (2000-2015)mentioning

confidence: 99%

A global map of mangrove forest soil carbon at 30 m spatial resolution

Sanderman

Hengl

Fiske

et al. 2018

Environ. Res. Lett.

296

191

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“…Despite accounting just for 4%–6% of the land area (Howe, Rodriguez, & Saco, ), wetlands accumulate between 20% and 30% of the whole terrestrial soil C stock (Smith, ), thus playing a disproportionate role in the global C cycle. As the ecosystems with the world's highest productivity per unit of area, wetlands combine the dual function of being a “C source” and a “C sink” (Andreetta, Huertas, Lotti, & Cerise, ). Therefore, even minor changes in the dynamics of wetland areas will affect global greenhouse gas emissions, which in turn will influence global warming (Tian, Chen, Zhang, Melillo, & Hall, ).…”

Section: Introductionmentioning

confidence: 99%

“…Despite accounting just for 4%-6% of the land area (Howe, Rodriguez, & Saco, 2009), wetlands accumulate between 20% and 30% of the whole terrestrial soil C stock (Smith, 2004), thus playing a disproportionate role in the global C cycle. As the ecosystems with the world's highest productivity per unit of area, wetlands combine the dual function of being a "C source" and a "C sink" (Andreetta, Huertas, Lotti, & Cerise, 2016).…”

mentioning

confidence: 99%

The response of stocks of C, N, and P to plant invasion in the coastal wetlands of China

Wang

Sardans

Wang

et al. 2018

Global Change Biology

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The increasing success of invasive plant species in wetland areas can threaten their capacity to store carbon, nitrogen, and phosphorus (C, N, and P). Here, we have investigated the relationships between the different stocks of soil organic carbon (SOC), and total C, N, and P pools in the plant–soil system from eight different wetland areas across the South‐East coast of China, where the invasive tallgrass Spartina alterniflora has replaced the native tall grasses Phragmites australis and the mangrove communities, originally dominated by the native species Kandelia obovata and Avicennia marina. The invasive success of Spartina alterniflora replacing Phragmites australis did not greatly influence soil traits, biomass accumulation or plant–soil C and N storing capacity. However, the resulting higher ability to store P in both soil and standing plant biomass (approximately more than 70 and 15 kg P by ha, respectively) in the invasive than in the native tall grass communities suggesting the possibility of a decrease in the ecosystem N:P ratio with future consequences to below‐ and aboveground trophic chains. The results also showed that a future advance in the native mangrove replacement by Spartina alterniflora could constitute a serious environmental problem. This includes enrichment of sand in the soil, with the consequent loss of nutrient retention capacity, as well as a sharp decrease in the stocks of C (2.6 and 2.2 t C ha‐1 in soil and stand biomass, respectively), N, and P in the plant–soil system. This should be associated with a worsening of the water quality by aggravating potential eutrophication processes. Moreover, the loss of carbon and nutrient decreases the potential overall fertility of the system, strongly hampering the reestablishment of woody mangrove communities in the future.

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“…Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 14 February 2019 Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 14 February 2019 doi:10.20944/preprints201902.0133.v1 The analysis of the areas called "Other" (occupied by villages and human settlements) leads to the conclusion that it is these areas of the park the ones that have suffered the greatest degradation. This degradation is related to the increase in population, which as on the rest of the African continent, is much higher in the vicinity of rivers and along the coast than in inland areas (e.g., almost 80% of Guinea-Bissau's population resides in the coastal zone [17] This fact has a very relevant impact on the degradation of the mangrove swamps due to land reclamation by the increasing population, pointing precisely this fact as the principal cause of the disappearance of mangals in the area.…”

Section: Savannahsmentioning

confidence: 99%

“…− They are important carbon sinks and produce large amounts of oxygen, which they return to the atmosphere. [17]. − They regulate the flow of rainwater and reduce the effects of flooding.…”

Section: Introductionmentioning

confidence: 99%

Changes in Land Use and Vegetation in Cacheu River Mangroves Natural Park, Guinea-Bissau: Contribution to Sustainable Management of the Park

López¹,

Toro²

2019

Preprint

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The aim of this paper is to study changes in land use and the evolution of vegetation in Cacheu River Mangroves Natural Park in the Republic of Guinea-Bissau. To do this, we will study variations in the NDVI, Normalized Difference Vegetation Index. In order to perform the calculations and subsequent analysis, images from three years-2010, and 2017-were used, all corresponding to the same time of year so that the phenological stage is the same. To perform a more reliable analysis, the park was divided into five classes based on the main use of the land: mangals, palm forest, paddy fields, savannahs and others. Using a statistical sample, same areas were selected for each class and the corresponding NDVIs were calculated for the years in which ASTER images were available. The study made it possible to conclude that at present, management of the park is not the most suitable, given that the changes in land use observed represent a decrease in mangrove swamps, despite the fact that these forests constitute the most important ecological area of all those that make up the park.Mangals are being replaced by other land uses.

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Land use changes affecting soil organic carbon storage along a mangrove swamp rice chronosequence in the Cacheu and Oio regions (northern Guinea-Bissau)

Cited by 42 publications

References 67 publications

A global map of mangrove forest soil carbon at 30 m spatial resolution

A global map of mangrove forest soil carbon at 30 m spatial resolution

The response of stocks of C, N, and P to plant invasion in the coastal wetlands of China

Changes in Land Use and Vegetation in Cacheu River Mangroves Natural Park, Guinea-Bissau: Contribution to Sustainable Management of the Park

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