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Revista Árvore

Print version ISSN 0100-6762On-line version ISSN 1806-9088

Rev. Árvore vol.43 no.5 Viçosa  2019  Epub Mar 23, 2020

http://dx.doi.org/10.1590/1806-90882019000500003 

Article

EVALUATION OF MANGROVE AND ITS ROLE IN THE ECONOMY AND STRATEGY TO CLIMATE CHANGE: CASE STUDY OF CUIARANA, PARÁ, IN THE BRAZILIAN AMAZON

AVALIAÇÃO DO MANGUEZAL NA ECONOMIA E ESTRATÉGIA DE MUDANÇA DO CLIMA: ESTUDO DE CASO DE CUIARANA, PARÁ, NA AMAZÔNIA BRASILEIRA

Nelson Castellón Rodríguez2  * 
http://orcid.org/0000-0002-2694-1074

Maria Isabel Vitorino3 
http://orcid.org/0000-0003-3253-5301

José Francisco Berrêdo4 
http://orcid.org/0000-0002-8590-2462

Mário Augusto Gonçalves Jardim4 
http://orcid.org/0000-0003-1575-1248

Adriano Marlison Leão de Sousa5 
http://orcid.org/0000-0002-2809-5318

Paulo Vinicius Caldas da Silva6 
http://orcid.org/0000-0003-0592-9460

2Universidade Federal do Pará, Programa de Pós-Graduação em Ciências Ambientais, Belém, PA-Brasil. E-mail: <castellon@gmail.com>.

3Universidade Federal do Pará, Faculdade de Meteorologia, Belém, PA-Brasil. E-mail: <vitorino@ufpa.br>.

4Museu Paraense Emílio, Belém, PA-Brasil. E-mail: <berredo@museu-goeldi.br> and <jardim@museu-goeldi.br> .

5Universidade Federal Rural da Amazônia, Departamento de Hidromecânica e Hidrologia, Belém, PA-Brasil. E-mail: <adriano.sousa@gmail.com>.

6Universidade Federal Rural da Amazônia,Graduado em Engenharia Ambiental, Belém, PA-Brasil. E-mail: <pvinicius@gmail.com>.


ABSTRACT

This research aimed to estimate the seasonal economic value of ecosystem goods and services from research on the use of mangroves in the Cuiarana community in the Eastern Amazon. The methodology of Total Economic Value was used, through interviews with 15 residents who extract products from the mangrove. For the ecosystem services, atmospheric carbon (measured by a micrometeorological tower), and organic carbon (monitored by soil sampling during 2017) were used. In determining product values, the quantities extracted at market prices and the value of services were estimated using carbon credits. The results indicate that the ecosystem produces 9 community assets, that generate R$ 75,033.50 (US$ 23,622.93 ha/year) and R$ 17,627.15 (US$ 5,549.58 ha/year) for capture and storage respectively. The VET value corresponded to R$ 986,132.50 (US$ 310,465.79). Ecosystem services and the economic values of atmospheric (p = 0.0278) and soil carbon credit (p = 0.0354) indicated higher importance in the rainy season due to the precipitation that favored an increase in the amount of carbon. This behavior was verified by the Principal Components Analysis (50.1%), which showed that in the less rainy season goods are more important when compared to the ecosystem services.

Keywords: Services; Economic Values; Carbon

RESUMO

Esta pesquisa teve como objetivo estimar o valor econômico sazonal dos bens e serviços ecossistêmicos a partir da pesquisa sobre o uso de manguezais na Comunidade de Cuiarana, na Amazônia Oriental. Foi utilizada a metodologia do Valor Econômico Total, através da entrevista com 15 moradores que extraem produtos do manguezal. Para os serviços ecossistêmicos, utilizou-se o carbono atmosférico medido por uma torre micrometereológica e carbono orgânico monitorado por amostragem de solo em 2017. Na determinação dos valores dos produtos, as quantidades extraídas pelos preços de mercado e o valor dos serviços foram estimados utilizando créditos de carbono. Os resultados indicam que o ecossistema produz 9 bens para a comunidade em torno de R$ 75.033,50 (US $ 23.622,93 ha/ ano) e R$ 17.627,15 (US $ 5.549,58 ha / ano) para a captura e armazenamento. O valor -VET correspondeu a R$ 986.132,50 (US $ 310.465,79). Os serviços ecossistêmicos e os valores econômicos do crédito de carbono atmosférico (p = 0,0278) e do solo (p = 0,0354) indicaram maior importância na estação chuvosa devido a precipitação que favoreceu a maior quantidade de carbono. Esse comportamento foi constatado pela Análise de Componentes Principais (50,1%), que mostrou que na estação menos chuvosa os bens são mais importantes quando comparados aos serviços ecossistêmicos.

Palavras-Chave: Serviços; Valores Econômicos; Carbono

1. INTRODUCTION

Mangrove is a productive and biologically important ecosystem of the world, as it directly and indirectly supplies essential goods and services to populations such as fish, shellfish, wood, sediment and nutrient retention, protection against natural phenomena and carbon storage (Barbier et al., 2011; Engle, 2011; Giri et al., 2010). It occupies an abundant and diversified narrow strip in the tropical region and integrates several ecosystem services valued at approximately US $ 200,000/ha annually (Costanza et al., 2014).

For Braat and Groot (2012), mangroves also provide raw materials such as wood, and a host of other ecosystem services including regulating services (coastal protection, carbon sequestration, erosion control and water purification), cultural services (tourism, recreation, education and research. The benefits of mangroves become an economic source of subsistence, providing the well-being of society (Vo et al., 2012), as evidenced by Singh et al. (2010), in India when they estimated that the extraction of non-timber products from mangrove forests contributed 79% to household incomes.

The mangrove plays a fundamental role in the control of atmospheric carbon emissions since it stores more quantity in the deeper layers of the soil (Donato et al., 2011). This ecosystem is recognized as a potential carbon sink and the key to carbon sequestration of biomass and soil (Adame et al., 2013; Alongi, 2014). Carbon sequestration reinforces mangrove maintenance and conservation as strategies for sustainable income generation and high productivity (Alongi, 2002; McLeod et al., 2011).

Mangroves decline at an annual rate of 0.7-3% caused by natural, human and deforestation impacts (Alongi, 2002; Fao, 2007; Lo et al., 2011). The high carbon sequestration potential can be a sustainable commercial alternative (Alongi, 2011; Donato et al., 2010; Fourqurean et al., 2012; Murdiyarso et al., 2015). In this context, Russell and Greening (2015), estimated values of up to US $ 23,000.0 for carbon sequestration in the mangroves of Tampa Bay, Florida.

The objective of this research was to estimate the seasonal economic value of the more important and traditional local ecosystem goods and services from the research on the use of mangroves and the use of mangrove in the village of Cuiarana in the Eastern Amazon. The hypothesis tested is that the mangrove are key ecosystems locally and globally because of their socio-economic and environmental importance, providing high-value goods to local communities and ecosystem services such as carbon dioxide capture and storage, becoming a mitigation strategy for climate change and of economic contribution through carbon credits represent additional income associated with the Total Economic Value of the ecosystem.

2. MATERIAL AND METHODS

The study area comprises the mangrove of the Experimental Site of the Federal Rural University of Amazonia (UFRA) and the Federal University of Pará (UFPA), located in the village of Cuiarana, in the municipality of Salinópolis-PA (0°40'S and 47°17 'WE). It is an area that belongs to the northeastern mesoregion of Paraense and the Salgado micro-region. The rainy season occurs in the months of December to May and the least rainy from June to November. According to Moraes et al. (2005) precipitations vary between 1,800 and 2,300 mm, and about 90% are distributed in the first six months of the year.

The Total Economic Analysis was based on the Modified methodological proposal of Total Economic Value (VET) of Carandang et al. (2013); Groot et al. (2002) and Goicochea (2011), estimating mainly the values of different uses, classifying use goods (marine and forest products) and non-use goods (CO2 capture and storage): VET=VUD+VUI Where; VET: Total Economic Value; VUD: Direct use value, VUI: Indirect use value.

The direct use assets were obtained through the case study methodology that involved 15 community respondents from an inventory of residents (100) that has a direct link as the mangrove for their subsistence, and then defined a sample of 15% according to Fidelman (2001) through a focal group composed of 15 direct users of the mangrove, due to the limited availability of time for community members for interviews. To define the types of uses were added the goods used per month of each interviewee and for the calculation of the economic value of the extractive activities were added the quantities of goods by each respondent and multiplied by the average prices in the market. Given that many mangrove goods do not have a market price (for example firewood) because their marketing is prohibited, the community defined symbolic prices in order to make a better estimate of the goods for direct use of the ecosystem. Non-use goods were obtained from a series of CO2 flux data measured by the 10 m Micrometeorological Tower installed in the vicinity of the mangrove under study with the aid of the EC-150 instrument, measured every 10 minutes during the year 2017 and calculated the seasonal and annual carbon credits.

The analysis of the carbon credits was calculated by the seasonal and annual CO2 (carbon dioxide) flow from the processing of the high frequency data to obtain the seasonal mean flows by means of a balance of CO2 flows (daytime flows less nocturnal flows), from the flows of CO2 was calculated as the CDM certified currency, as proposed by Fonseca (2010). The calculation comprises the conversions of units of the CO2 flows for the unit considered as CERs emission and then the certified currency. For the calculation of the CDM certified currency (CERs), the average value of the carbon balance in micromol square meters per second (µmol.m-2.s-1) was converted. Thus, µmol for gram, taking into account the molar mass of the CO2, then the conversion to grams.m-2.s-1 (grams per square meter per second), the conversion was done from seconds to one year and from m2 to hectare to reach the value in TCO2e/ha/year (tons of carbon equivalent hectare per year). This generated a carbon dioxide balance per hectare (ha) and then calculated the carbon credits under the LULUCF modality (Land use and Change Forest) of the Kyoto Protocol for 20 years (Global Warming Potential Time horizon according to IPCC 2001) and 15.000,0 ha (projects classified as small-scale CDM project activities). The result of the CO2 balance was multiplied by 15,000 ha and for 20 years. The result was multiplied by the price of carbon credits (in Real or Dollar) and divided between 15,000 ha and soon divided between 20 years to know the income per ha.

The organic carbon contents were analyzed in a total number of nine plots, were randomly established to collect 1 kg soil during each season of the two seasons, Less Rainy Season (November 2017) and Rainy Season Less Rainy Season (May 2017). Total Organic Carbon (TOC) levels measured in nine 20 x 20m plots up to 20 cm depth were used to quantify the soil organic carbon stored in the soil and applied to the Kauffman and Donato (2012): C.O (tn.ha-1))=DR(g.cm-3)*I.A (cm)*%C

where: C.O = Carbon in soil; DR = Relative Density; I.A = Sampling Interval; % C = Percentage of Carbon.

To calculate the tons of carbon equivalent, the average levels of organic carbon per hectare per year (tC/ha/year) were used in the rainy and less rainy period and multiplied by the conversion factor 3.67 (ratio of molecular weight of CO2 is 44 and carbon 12 = 3.67) according to the Howard et al. (2014). The value of this ratio was multiplied by the price of the carbon credit to calculate the rent for stored carbon.

The price of carbon credit will depend on the market defined. In this study, the price of US $ 20.00 (R$ 63,526.0) per carbon credit was adjusted based on a World Bank Goup price range (2017) with the exchange rate on 08/08/2017 of R$ 3.1763 per US Dollar on the website of the Central Bank of Brazil.

Total Economic Value (VET) was calculated from the sum of the economic values of the assets (direct use) and the values estimated by carbon credits for the capture and storage of carbon in the soil (indirect use) and multiplied by 12.5 ha corresponding to the size of the studied mangrove. The economic values are presented in Brazilian Reais and American Dollars.

3. RESULTS

3.1. Direct benefits: mangrove goods

In the temporal analysis of quantities and types of mangrove goods (Fig. 1), the extracted products are represented by nine categories of forest and marine products: wood, firewood, fish, crab (Ucides cordatus), (Calinectes sp.), mussels (Limnoperma fortunei), Turú (Teredo sp.), Shrimp (Litopenaeus schmitti) and Sarnambi (Lucina pectinata) which are obtained throughout the year. Among the nine products, the crab is characterized by abundance and commercial demand. The largest amount extracted from the products, mainly from the crab, occur in the less rainy period, in June and July. The crab is the product that is extracted more frequently and in greater quantity by the families mainly for the sale.

Figure 1 Time variation of the amount of mangrove property extraction in Cuiarana Village, Salinópolis, Pará, Brazil. 

Figura 1 Variação temporal da quantidade de extração dos bens do manguezal na Vila de Cuiarana, Salinópolis, Pará, Brasil. 

With 76.2% of the total variance (PC1/PC2), the variables Crab, Siri, Firewood, Shrimp, Mussel and Turkey present negative correlations and months associated with these variables: July, August, September, October, and November. Atmospheric and organic carbon, Sarnambi and Pisces present positive correlations and the months associated with these variables are; January, February, March, April, May (Fig.2). This result may be favored by the environmental conditions that are conducive to carbon capture and storage.

Figure 2 Principal Component (PC) of the monthly importance of mangrove goods and services in the village of Cuiarana, Salinópolis, Pará, Brazil. 

Figura 2 Componente Principal (PC) da importância mensal dos bens e serviços de mangue no município de Cuiarana, Salinópolis, Pará, Brasil. 

He table 1 presents the estimated economic value per hectare per year for the direct withdrawal of mangrove goods, equivalent to approximately R$ 75,033.50 (US $ 23,622.93), but with the contribution of 35% of the mussel, 13% of the shrimp, 12% of the crab, 12% of sarnambi and the rest of the goods with 28%.

Table 1 Sazonal Economic value of the goods in the mangrove in the in the rainy season and Less rainy season in the village of Cuiarana, Salinópolis, Pará, Brazil. 

Tabela 1 Valor econômico da atividade extrativista no manguezal na Vila de Cuiarana, Salinópolis, Pará, Brasil. 

U G. G. G. A. I.T I.RS I.LRS
Goods Measure T. RS LRS V (R$) (R$) (R$) (R$)
Wood M 675 100 575 10 6,750 1,000 5,750
Firewood U 212 33 179 1 212 33,5 178
Fish Kg 824 432 392 8 6,592 3,460 3,132
Crab U 4,678 1,655. 3,023 2 9,356 3,311 6,045
Crayfish U 1,784 552 1,232 3 5,352 1,656 3,696
Mussels Can 1,046 483.0 564 25 26,162 12,087 14,075
Turú Can 143 62.0 82.0 15 2,152.5 930 1,222.5
Shuimp Kg 437 114.0 323 22 9,614.0 2,508 7,106
Sarnambi Can 327 172.0 156 27 8,842.5 4,630 4,212
I/ha (R$) 75,033 29,616 45,417
I./ha (US $) 23,623 9,324 14,298

M=Meters, U=Units, Kg= kilograms, I/ha=Income hectare, G.T=Goods Total, G.RS = Goods Rainy Season, G.LSR= Less Rainy Season, A.V= Average Value, I.T= Income Total, I.RS= Income Rainy Season, I.LRS= Income Less Rainy Season, R$= Brazilian Real, US $ = American Dollars.

Seasonality influences mangrove property in order to present the highest economic yields of 61% of the annual total in the least rainy season, with the highest incomes with mussels (31%), shrimp (16%) and crabs (13%). In the rainy season, the most valuable products are mussels (41%), sarnambi (17%), fish (12%) and crayfish (11%). Thus, the results confirm that it is precisely in the less rainy period, more specifically in July, that the majority of respondents (55%) more frequent the mangroves for the extraction of their products. This result may be related to the greater accessibility by the decrease of the precipitations in the zone.

The table 2 shows the economic analysis of carbon credits based on LULUCF-CDM projects in 15,000 ha, this calculation suggests a 20-year scenario and having as reference the 60.72 TCO2e/ha/year (60.72 certificates / credits) withdrawn by mangrove per hectare assuming prices of R$ 63,526 (US $ 20) per ton of carbon. The estimated economic value corresponded to R$ 3,857.30 (US $ 1,214.40) per hectare per year.

Table 2 Sazonal economical value associated with carbon credits (mean value of carbon credits = US $20.0) based in atmospheric carbon in the mangrove forest in the in the rainy season and Less rainy season in Cuiarana, Salinópolis, Pará, Brazil. 

Tabela 2 Valor econômico sazonal associado a créditos de carbono (valor médio de créditos de carbono = US $ 20,0) baseado em carbono atmosférico no manguezal no período chu'voso e menos chuvoso em Cuiarana, Salinópolis, Pará, Brasil. 

Variables Rainy Less Rainy Total
Season Season Income
TCO2e/ha/year a 32.32 28.40 60.72
TCO2e/ha/year
(15000ha)
9696,000.0 8520,000.0 18216,000.0
R$/15000ha
(20 years)
615948,096.0 541241,520.0 1157189,616.0
US $/15000ha
(20 years)
193920,000.0 170400,000.0 364320,000.0
R$ ha/year 2,053.16 1,804.14 3,857.30
US $ ha/year 646.4 568.0 1,214.4

a Estimated from Mattos (2010).

TCO2e. = Tons of carbon equivalent R$= Brazilian Real, US $= American. Dollars, ha=Hectare.

The economic analysis of the carbon credits by carbon storage using the reference to the 216,76 TCO2e/ha/year stored per hectare (20 cm depth) assuming prices of R$ 63,526 (US $ 20) per ton of carbon equivalent. The estimated economic value corresponded to R$ 13,770.05 (US $ 4,335.25) per hectare per year, of which 63% corresponded to the rainy season.

The table 3 shows the estimated Economic Value for 12.5 hectares referring to the study area. The highest economic value in the ecosystem corresponds to goods with R$ 75,033.50 (US $ 23,622.93), the service, capture of atmospheric carbon R$ 3,857.10 represents (US $ 1,214.34) and the storage of CO2 in the soil R$ 13,770.05 (US $ 4,335.25) per hectare per year. The Economic Value in the total area studied (12.5 ha) corresponded to R$ 986,132.50 (US $ 310,465.79).

Table 3 Total Economic Value in the mangrove associated with atmospheric carbon and soil carbon in the village of Cuiarana, Salinopólis, Pará, Brazil. 

Tabela 3 Valor Econômico Total no manguezal associado com o carbono atmosférico e arbono do solo na vila de Cuiarana, Salinopólis, Pará, Brasil. 

Goods and
Services
Economic
Value
R$/ha/year
Studied
Area
hectare
Total
Economic
Value
(R$)
Total
Economic
Value
(US $)
Mangrove
good 75,033.50 12.5 937,918.75 295,314.47
Atmospheric
carbon
3,857.10 12.5 48,213.75 15,180.65
Soil Carbon 13,770.05 12.5 96,559.52 30,402.87
Total 92,660.65 - 986,132.50 340,897.99

R$ = Brazilian Reais, US $ = US Dollars, ha=hectare

The ANOVA test revealed that, there was a significant difference between the economic value to goods, atmospheric carbon credit and soil carbon credit (p = 0.0237) and Tukey’s test indicated greater statistical importance of atmospheric carbon credit (p=0.0278) and soil carbon credit (p=0.0354) when compared with goods mainly in the rainy season due to difficulty of extraction of goods due to adverse environmental conditions inside the mangrove.

4. DISCUSSION

The extracted products in this mangrove are represented by nine categories of forest and marine products and the largest amount extracted from the products, mainly from the crab. Mojiol et al. (2016), studying the mangrove in Sabah, Malaysia have shown that mangrove products can be divided into nine categories (marine, firewood, building materials, medical values, household uses, fishing, food/beverages, decoration/and shells). Warren-Rhodes et al. (2011), studying mangrove ecosystem goods in Solomon Islands identified 30 types of mangrove goods nearly 75% were classified as important or very important.

Goods like crab is the product extracted for commercial purposes with more frequency and quantity by the families. It is the second largest crustacean of Brazilian mangroves, and one of the most commercially exploited resources in the north and northeast regions of Brazil (Pinheiro et al., 2005). It is an economic and subsistence resource in all mangrove areas in Brazil (Alves and Nishida, 2002; Glaser and Diele, 2004; Carvalho and Jardim, 2019). In Bragança, northeastern Pará, the crab is collected and sold by 42% of the population and accounts for 38% of local income Glaser (2003).

The significance of atmospheric carbon and organic carbon in the rainy season is a result related to environmental conditions, since 90% of rainfall in this zone is distributed in the first six months of the rainy season (Moraes et al., 2005). This argument is in agreement with McLeod and Salm (2006), argue that with the decrease in precipitation rates mangrove productivity decreases by the effect on its growth and mangrove survival.

The estimated economic value per hectare per year for the direct withdrawal of mangrove goods, equivalent to approximately R$ 75,033.50 (US $ 23,622.93) and least rainy season present the highest economic yields of 61% of the annual total. Barbier (2000) and Rönnbäck (1999), estimated the annual market value of crustaceans, molluscs, shrimp and fish, which depend directly or indirectly on the mangrove during its life cycle and the value of the mangroves associated with its support function (eg primary production, biodiversity, nutrient cycle) ranged from US $ 750 to US $ 16,750.0 per hectare per year. According Moraes et al. (2005), in this area, about 90% of the precipitation is distributed in the first six months of the year that represents the rainy season this environmental situation could favor the extraction of species.

The total annual atmospheric CO2 of catch of 60.72 TCO2e/ha/year and highest capture occurs in the Rainy Season with 32.32 TCO2e/ha/year. This result differs from that found by Fonseca (2005), in the Itaipu mangrove, Rio de Janeiro, which reports 76.09 TCO2e/ha/year of atmospheric carbon captured. Kairo et al. (2009), studying a mangrove stretch in Kenya with Rhizophora dominance showed that carbon sequestration was equivalent to 53.3 TCO2e/ha/year, corroborating the values recorded in this study. The high CO2 capture capacity is evident when comparing other tropical species such as pine (Pinus spp.) and eucalyptus (Eucalyptus spp.) with 38.6 TCO2e/ha/year of carbon captured as indicated by Fonseca (2010). The economic analysis of carbon credits based on LULUCF-CDM projects is estimated economic value corresponded to R$ 3,857.30 (US $ 1,214.40) per hectare per year and the economic analysis of the carbon credits by carbon organic storage in the mangrove soil is estimated in R$ 13,770.05 (US $ 4,335.25) per hectare per year, of which 63% corresponded to the rainy season.

Was estimated that the minimum carbon credit value for the mangrove forest in the Sungai Haji Dorani (SHD) and Kuala Selangor Nature Park (KSNP) was US $ 3,314.23 ha-1 and US $ 5,89.83 ha-1 (Hong et al., 2017), and according to Donato et al. (2011), soils are the most decisive for carbon fate in mangroves when storing up to 98% of carbon. Kairo et al. (2009), assuming prices of US $ 10 per tonne of carbon, estimated that the Gazi Bay, Kenya, mangrove generated income of US $ 533.00 per hectare. The highest economic value in the ecosystem corresponds to goods with R$ 75,033.50 (US $ 23,622.93), the service, capture of atmospheric carbon R$ 3,857.10 represents (US $ 1,214.34) and the storage of CO2 in the soil R$ 13,770.05 (US $ 4,335.25) per hectare per year and the total area studied (12.5 ha) corresponded to R$ 986,132.50 (US $ 310,465.79).

Salem and Mercer (2012), studying economic goods and services of mangroves in different continents (Africa, Asia and America) concluded that 1 hectare of mangrove yields US $ 30,864.00 a year in seafood (fish, shellfish) and forestry US $ 4,265.00 for carbon sequestration. Russell and Greening (2015), estimated values of up to US $ 23,000 for carbon sequestration in the Tampa Bay, Florida mangroves. Constanza et al. (1997), reported a VET of ecosystem services in mangroves of US $ 9,990.00 ha/year. Values of lower goods and services were demonstrated by Brander et al. (2012), when they recorded a value of US $ 4,185.00 ha/year for a mangrove in Southeast Asia and from US $ 685.8 to 1,038.70 ha/year for different mangrove uses in Palawan and Bohol, Philippines (Carandang et al., 2013). Sathirathai and Barbier (2001), estimated economic value of mangrove forests to a local community in southern Thailand is in the range of US $ 27,264.0 - US $ 35,921.0 ha/year.

Constanza et al. (1997), reported a VET of ecosystem services in mangroves of US $ 9,990.00 ha/year. Values of lower goods and services were demonstrated by Brander et al. (2012), when they recorded a value of US $ 4,185.00 ha/year for a mangrove in Southeast Asia and from US $ 685.8 to 1,038.70 ha/year for different mangrove uses in Palawan and Bohol, Philippines (Carandang et al., 2013).

5. CONCLUSION

Mangroves are an economically strategic ecosystem of great importance to coastal families who have a subsistence economy by providing goods of high demand and high market value throughout the year, but more prominently in the less rainy period of the region in the case of assets. Based on the VET methodology, the economic income according to the total area was estimated in R$ 986,132.50 (US $ 310,465.79) or RS 92,660.65 per hectare per year. Estimates of the atmospheric carbon capture capacity and storage in the soil of the mangrove have shown superiority when compared to other ecosystems, allowing it to be an ecosystem of local and global economic value, being able to be useful for the mechanisms of the RECs and to become a complementary economic source.

6. ACKNOWLEDGMENTS

The authors thank the residents of the village of Cuiarana, Salinópolis, Pará for the information given at the time of the interviews. To the Large-scale Biosphere-Atmosphere Project (LBA) for the facilitation of carbon dioxide data. To the Museu Paraense Emilio Goeldi for assistance in soil carbon analysis.

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Received: March 11, 2019; Accepted: August 30, 2019

*Corresponding author.

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