Abstract
Coastal ecosystems are characterized by high content of soil carbon storage; however, they experience severe land conversions in the past decades. The current study aims to examine how different land use/land cover (LU/LC) impact carbon stock in coastal ecosystem along Jazan coast, Saudi Arabia. In this study, impacts of LU/LC on carbon stocks in the coastal zone of Jazan, Saudi Arabia in 2009, 2013, and 2021 were assessed. Also, the LU/LC dynamics were evaluated using data provided by the land use dynamic model. The carbon stocks were modelled based on LU/LC using the InVEST program. Our study results showed that the decrease in mangroves from 2013 to 2021 reflects the high atmospheric emissions of carbon dioxide (CO2). Also, the increase in built-up areas might negatively impact total carbon stock. The estimated carbon stocks for the coastal zone of Jazan biome were 7279027.42 Mg C in 2009 (1Mg = 106 g). It decreased to 2827817.84 Mg C in 2013, with a total loss of − 4450675.40 Mg C, and an average of annual loss of − 1,112,669 Mg C in the study period with net value of − 461240790.53 US$. On the other hand, the total estimated carbon stock was increased from 2013 to 2021 with a 3772968.31 Mg C in 2021 (a total gain 944840.87 Mg C). Based on the current findings, we recommend that land-use-policy makers and environmental government agencies should implement conservation policies to reduce land use change at Jazan coastal ecosystems.
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Introduction
The continuous increase of greenhouse gases emissions including carbon dioxide (CO2) is mainly due to fossil fuel combustion and changes in land use practices including those caused by deforestation (IPCC 2007). Emission of CO2 significantly impacts global warming and climate change as evident in its increased concentration from 280 ppmv in 1850 to 411 ppmv in 2019 (Page 2019). Many scientists have recommended alleviating the impact of climate change through CO2 sequestration in soil organic carbon (SOC) (Siikamӓki et al. 2012a; Taillardat et al. 2018). Moreover, to follow the Paris Climate Agreement’s climate recommendations, it is recommended to increase SOC stocks and protect carbon rich soils (e.g., coastal wetlands) from negative impacts including land conversions of natural habitats to agricultural lands (Rumpel et al. 2018; Keshta et al. 2022).
Apart from geologic and oceanic stocks, soil is a fundamental global carbon stock (approximately 1400–1600 Pg; 1Pg = 1015 g), that can store up to 4.5 times more carbon than the earth’s total biomass and 3.3 times more carbon than the atmosphere (Post et al. 1982; Eswaran et al. 1993). The carbon that is concealed in coastal ecosystems is called “blue carbon” (Siikamäki et al. 2012b). Coastal wetland soils can store about 450 Pg carbon and form nearly one-third of the global carbon stocks (~ 1550 Pg) (Bai et al. 2016). Also, coastal wetlands can accumulate carbon as 30–50 time more than forest per unit area (Mcleod et al. 2011; Ouyang and Lee 2013), which emphasizes their importance to the global carbon cycle (Howard et al. 2017). Coastal wetlands are among the most productive and biologically diverse ecosystems in the world (Barbier et al. 2011). Moreover, coastal ecosystems have many ecosystem services and functions including carbon storage, flood protection, water treatment, climate regulation, and other services that help local communities to overcome poverty (Costanza et al. 1997).
At regional and global scales, land use change detection using satellite imageries is a fundamental tool for assessing the impacts on soil C stocks. Remote sensing has many applications including assessing land use changes for coastal ecosystems. Mulders 2001, concluded that satellite imageries obtained for the same area at different time intervals is one of the most used methods to estimate the temporal changes in land use. For an efficient and best-productive land use management, Sharma et al. 2019 reached to a conclusion that the assessment of land use changes through satellite imageries interpretation would lead into increasing C stocks and minimizing C emissions. Remote sensing is a powerful tool for assessing global C inventories since the obtained satellite imageries through different sensors (e.g. optical devices and radar, etc.) cover large areas of land and give higher quality C estimations at lower cost (Richards 2013).
Our current study is a part of a series of articles that aim to assess SOC stocks in various Saudi Arabian coastal wetlands (Eid et al. 2016, 2019, 2020; Arshad et al. 2018; Sanderman et al. 2018; Shaltout et al. 2020). Accordingly, the goal of the current study was to assess land use/land cover impacts on blue carbon storage of coastal ecosystems along Jazan coast, Saudi Arabia. Studying the impacts of land use changes on coastal blue carbon stocks would provide baseline information and guidelines for implementing coastal wetland restoration along Saudi Arabia’s Red Sea coast to help policy makers and government agencies to maximize benefits and ecosystem services provided by coastal ecosystems.
Materials and Methods
Study Area
Jazan city is located in the southwest of Saudi Arabia on the border with Yemen and west of the Red Sea (Fig. 1). It is located along the 42° and 43.8° E longitude and between 16.5° and 17° N longitude. It has an area of 13,500 km2 with a population of about 1.5 million. According to 2030 country’s vision, the coastal zone of Jazan has important projects to support urbanization and industrial activities (Al-Hatim et al. 2015). The terrain of Jazan city varies, while the coastal area extends from north to south. Salt marshes are one of the most common coastal wetland habitats, while Tihama area is the most fertile area of Jazan. Jazan also has more than 100 islands on the Red Sea. The city can be divided into three parts: inland areas, forests, and plains. The interior area is a series of mountains and forests with rich pastures, plains rich in crops such as coffee beans, grain crops (e.g., barley), and fruits (e.g., grapes). It also contains some types on mangrove in the coastal zone.
Data Collection and LU/LC Dataset
To analyze the LU/LC changes, data were extracted from three cloud-free Thematic Mapper (TM), Enhanced Thematic Mapper (ETM), and Operational Land Imager (OLI) satellite images that obtained in 2009, 2013, and 2021. Landsat images with resolution and low cloud were downloaded using United States Geological Survey (USGS) (http://glovis.usgs.gov.). All images were referenced using UTM system, zone 36 N and then were radiometry corrected using FLASH atmosphere correction using ENVI 3.5 for further analysis. Calibrations were required to eliminate errors occurred during acquisition procedure (Abd El-Hamid et al. 2019).
Vegetation Index
Vegetation indices were computed using NDVI (Normalized Difference Vegetation Index). NDVI use band 3 (Red) and 4 (Near Infrared) for Landsat 7, and band 4 (Red) with band 5 (Near Infrared) for Landsat 8. NDVI approaching calculation of greenness degree (sea grass, mangroves and agriculture). Vegetation degree of an image correlates with vegetation crown density. NDVI index ranges from − 1 to + 1. Higher NDVI index indicates more crown density. NDVI is formulated as below:
Vegetation Cover of Jazan’s Coast
Vegetation is the biomass and C storage strength that regulates the climatic change in any area. Presence of vegetation along the study area reflects the C and biomass stock. NDVI is a good indicator of vegetation. NDVI index was classified into six main groups, in our study, as follows (Fig. 2): no vegetation, lowest dense, lower dense, dense, higher dense, highest dense (Zaitunah et al. 2018). In 2009, our results indicated that the class of highest dense was increased from 2009 to 2013 and decreased from 2013 to 2021. Also, some patches of highest dense class were converted to a higher dense class. The higher dense area represents some forest, planting, and agriculture. Lower and lowest dense were common along coastal and settlement areas (dense populations with human activities). High human accessibilities are also found there, so that land use and land cover are impacting by human activities. The road attracts human for changing land use and land cover. Human will convert forest to agricultural lands, which in turn triggers land use changes. Closer to the roads, forest fragmentation and deforestation increase as a result of the close relationship between building houses and existence of roads. Along Jazan’s coast, vegetation landscape is continuously changing as a result of ongoing human activities. Similar to other research findings, our results indicated that the main cause of the C storage loss is related to wetland habitat loss and conversion of natural ecosystems, which are well known by their potential to store C (Lau 2013), due to land built-up (Jiang et al. 2017).
Landsat Classification
The Landsat images were classified into six main classes by using a combination of unsupervised and supervised classification techniques. This is according to skillful information of the LU/LC in the study area and field data of the predominant land cover using Google Earth. The land use and land cover were classified using supervised classification based on the land cover classification system and field observation as ground truth. Every class was identified and drawn using ArcGIS 10.5. (Abd El-Hamid 2020). The field data represent the ground truth. The study area was classified into six classes; open water, vegetation or mangroves, built up, sabkha, and barren. Open water pixels include deep and shallow water, vegetation pixels represent those areas that usually used for growing various plants. Urban pixels represent those areas that include houses, factories, commercial, residential areas, and other places. Finally, bare lands include coastal zone and all desert areas.
LU/LC Prediction Using the CA–Markov Model
For accurate prediction of the LU/LC, Cellular Automata (CA) and the Markov model adopted from IDRISI software were used in the present study (Zhao and Peng 2012). The model used to simulate land use changes and presents the spatial and numerical distribution of transition. Markov model estimates the probability of change from one state to another, taking the LU/LC changes at various times into consideration. In this model, the dynamic change of any study area depends on earlier or current land cover state and calculated using following equations:
Where, S(t) is the state of the system at time t, S(t+1) is the value and state of the system at a time (t + 1); Pij is the transition probability matrix. The reliability of land use change modeling can be improved by joining two or more simulation methods to include the benefits of both. It is well known that CA–Markov model has been used recently in dynamic spatial phenomenon’s simulation and future land use change prediction.
Validation of simulated LU/LC
The validation of the model is an important part of any prediction-based studies. Kappa index is frequently used for examination the accuracy of the model in many studies. Landis and Koch (1977) stated that if Kappa index is less than or equal to 0.4, it reveals that land use changes greatly with poor consistency between the two images. On the other hand, when Kappa index ranges between 0.40 and 0.75, this indicates obvious changes between the two images with higher consistency. The Kappa index varies from 0 to 1. Values from 0.61 to 0.80 mean substantial, whereas values from 0.81 to 1 mean almost perfect. In this study, Kappa index was 0.81, which indicates that the obtained results are more reliable and with high consistency between the actual observed and predictive results. In this study VALIDATE model was used in IDRISI Selva to compare the predicted 2031 LU/LC with actual 2021 LU/LC to assess the accuracy of the model.
LU/LC dynamic
ESV (Ecosystem Service Value) is mainly affected by natural and man-made factors. ESV has been altered by many factors as construction and other development activities. The land-use intensity not only reflects natural aspects of different land-use types themselves, but also shows the integrative impacts of human factors and natural ecological factors. In the present study, the land-use comprehensive index (L) was introduced to reflect the human activities. It was calculated as following:
From three equations, L denotes the comprehensive index of land use degree, L: 100–400, the closer the L is to 400, the higher the degree of development and utilization; Ai represents the classification index of the land use type; Ci represents the percentage of land use type area; Δ Lb−a characterizes the change in the comprehensive index of land use change; La and Lb represent the comprehensive land use degree index of a and b time phases; Ci.a. and Cib represent the area percentage of the i-type land type in the two stages a and b; and R characterizes the change rate in land use. To ensure the dynamic of LU/LC in the present study, R has been categorized into three classes as following: (1) if R value more than zero, then the study undergoes development phase; (2) if R value less than zero, then the study undergoes decay phase; and (3) finally if R value equal to zero, then the study undergoes stabilization or adjustment phase.
Carbon quantification
To estimate the amount of carbon (C) storage and sequestration, a new module has been used based on C cycle in the selected study area (He et al. 2016; Tallis et al. 2013). In the current study, there were four C pools that includes aboveground C density, belowground C density, soil organic C, and dead organic matter (Tallis et al. 2013). The calculation of the C storage Cm,i,j in a given grid cell (i, j) with land-use type “m” can be achieved by the following equation (Aalde et al. 2006):
In this formula, A is the real area of each grid cell (ha). Also,\({C}_{am,i,j}\),\({C}_{bm,i,j}\),\({C}_{sm,i,j}\), and \({C}_{dm,i,j}\)are the aboveground C density, belowground C density, soil organic C density, and dead organic matter C density (i, j), respectively. Finally, C storage and sequestration “S” can be computed by next equations for the present study area (Aalde et al. 2006):
\({C}^{T2}\) and \({C}^{T1}\) demonstrate static C storage in years T2 and T1 (T2 > T1). Using InVEST software; LU/LC and biophysical data are used as inputs to calculate the total amount of C stocks (Sharp et al. 2020).
Carbon sequestration valuation
Carbon storage was estimated using the Carbon Sequestration Storage Model (CSSM) using the InVEST program, established by the Natural Capital Project of the University of Stanford, which consists of a compilation of theoretical models that allow the assessment of several ecosystem services (Sharp et al. 2018). Coastal C stocks are dependent on many factors including aboveground biomass (aerial vegetation), dead biomass (dead branches and litter fall), underground biomass (roots), and soil organic matter (SOM). The CSSM model considers C quantity stored in those pools, based on LU/LC maps. The information to estimate the C stocks were based on the LU/LC and C reservoir maps using the CSSM. The CSSM was applied for the study area and for the LU/LC classes considered in the study (Sabkha, mangroves, vegetation and water bodies) for 2009, 2013, and 2021. Changes in C stocks were assessed based on mean values reported in the literature (Villela et al. 2012). The C stocks were estimated for each LU/LC class, and for the four C sets considered in these analyses: aboveground biomass (vegetation), dead biomass (dead branches and litter fall), underground biomass (roots), and SOM. The economic value (expressed as United Stated Dollar $) of C stocks was based on estimated values for each year. The estimates indicate values between $14 and $41, with a mean of $24 per Mg CO2. Carbon social cost provides an estimate linked to socio-environmental costs of climate changes, therefore, more consistent with the reality. Carbon credits denote only the payment of agents, and they did not include the socio-environmental costs of climate changes to the society. This function in the next equation, requires three inputs, including (I) “V,” the monetary value of each unit of carbon, (II) “r,” a monetary discount rate, and (III) “c,” the change in the value of carbon sequestration over time (Tallis et al. 2013):
The first input “V” is estimated based on the social cost of carbon (SCC) that is released Mg of carbon in the atmosphere in case of excess of the threshold.
Results and Discussion
Changes in LU/LC during 2009, 2013, 2021, and prediction in 2031
Six classes were extracted; open water, vegetation or mangroves, built up, sabkha, and barren as shown in Fig. 3. The distribution of total area covered by the different LU/LC classes and their percentage of cover in the years of 2009, 2013, 2021, and 2031 are presented in Table 1. Mangroves areas continued their decreasing trend from 2009, 2013, 2021, and modeled 2031, where it decreased from 53.29 km2 (0.97%), 28.40 km2 (0.52%), 25.79 km2 (0.47%) and 20.35 km2 (0.39%), respectively. On the other hand, vegetation in the study area reduced from 143.04 km2 (2.60%) in 2009 to 93.07 km2 (1.69%) in 2013, followed by a rise in 2021 to 143.75 km2 (2.61%) and then to 150.26 km2 (2.90%) in modeled 2031. Also, barren reduced from 1864.40 km2 (33.86%) in 2009 to 1678.85 km2 (30.55%) in 2013, followed by a rise in 2021 to 1792.03 km2 (32.55%) and then reduced to 1090.71 km2 (21.05%) in modeled 2031. On the other hand, built-up areas experienced an increase from 36.38 km2 in 2009 to 249.45 km2 in 2013, followed by a rise in 2021to 299.93 km2 and then to 350.01 km2 in modeled 2031. Sabkha areas continued their decreasing trend from 2009, 2013, 2021 and increased in modeled 2031. Finally, open water in our study area increased from 2886.79 km2 (52.43%) in 2009 to 2985.81 km2 (54.33%) in 2013, followed by a decrease in 2021 to 2855.23 km2 (51.86%) and then increased to 2880.69 km2 (63.31%) in modeled 2031 as shown in Fig. 4. Mangroves might have decreased as a result of anthropogenic effects and climatic change. The increase in built-up area was related to Kingdom of Saudi Arabia’s Vision 2030. The annual rate of LU/LC change was shown in Fig. 5. For more details, gain and loss was detected showing the loss amount of barren and the increase amount of vegetation during the period from 2009 to 2013, on the other hand, from 2013 to 2021 mangrove lose large amount of its area. The main factors related to the increasing development land uses at the expense of deteriorating the mangroves and vegetation covers can be attributed to urban expansion (Abbas et al. 2021). Generally, the recent development can mainly change the natural environment during the last periods (Seto and Kaufmann 2003).
CA-Markov Model Validation
Generally, it is important to evaluate the results classified images from classification with real map of the study area. In the current study, the predicted image (2031) was extracted after high accuracy of CA-Markov model. Accuracy of results shows that decreasing and increasing in spatiotemporal rate of each class trustworthy. Therefore, CA-Markov is a trustable model to predict the future LU/LC. CA-Markov is a forecasting model based on historical data collection. Therefore, it analyzes the combination of past tendencies and then it provides future scenarios. However, CA-Markov does not involve any environment and socioeconomic aspects. Moreover, this model considers/analyzes the changes in the selected area and if there are some influential cells it cannot measure them (Von Neumann 1951). In the current study, two validation models were implemented for 2009 to 2013 and for 2013 to 2021. The Kappa statistics such as Kstandard (0.75), Kno (0.84), and Klocation (0.89) were for the period from 2013 to 2021, while the overall agreement of 0.82 indicates the reasonable performance (78%) of the model. The accuracy assessment of the classified image is acceptable and reasonable for applications. According to the Kappa index of agreement values that exceed the minimum acceptable standard, and they were greater than 80%, our results indicate that there was agreement between predicted and actual LU/LC map similar to others (Mishra et al. 2014).
Land Use Dynamic and Transition Probabilities
Results of land use dynamic reflect the recent development along the coastal zone of Jazan city. In the current study, the comprehensive index was increased from 2009, 2013, and 2021(141.5, 150.6, and 159.5, respectively, Table 2. All data were in the range of 100–400, representing that land use has been in a reasonable development stage. The comprehensive land use index continued to increase showing high development from the initial year to the final year. The degree of transformation in land use is more than zero. R values were 0.0644, 0.0594 and, 0.1132 for 2009, 2013, and 2021, respectively. In general, urbanization is mainly responsible for transformations of agricultural land. The changes in the LU/LC were observed between two periods, from 2009 to 2013 and 2013–2021. About 1528.00, 23.71, 18.98, 2845.00, 174.52, and 54.55 km2 of barren, built-up, mangroves, open water, sabkha and, vegetation, respectively, were noted as shown in Table 3. Due to this conversion, mangroves and vegetation lands experienced high expansion, accompanied by significant changes in barren lands. Large area of sabkha and barren were converted into urban area. Table 4 displays the summary of the probability matrix for major LU/LC conversions for all classes in Jazan that took place between 2013 and 2021 of the first scenario. For instance, the probability of change for mangroves to mangroves is very low but the conversion from open water to open water and from built-up to built-up are very high, 99% and 84%, respectively. Gain and loss of LU/LC were showed in Fig. 6. All cubic trends of LU/LC were observed in Figs. 7 and 8. All cubic trends from one class to another simulate the current situation of the development plan in Jazan city. Also, the transition to mangroves does not appear along the study periods, where the transition to the built-up area appeared in regular manner around the study area.
Carbon Stocks and Sequestration
Our results of C stock for LU/LC classes in the different biomes were modeled using the InVEST program. The spatial distribution of C stock variation in the coastal zone of Jazan is presented in Fig. 9. The estimated C stocks for the coastal zone of Jazan biome was 7279027.42 Mg in 2009. It decreased to 2827817.84 Mg C in 2013, a total loss of − 4450675.40 Mg C, an average of annual loss of − 1,112,669 Mg C in the study period with net present value of − 461240790.53 US$ as shown in Table 5. On the other hand, the total estimated C stock was increased from 2013 to 2021 with 3772968.31 Mg C in 2021, a total gain of 944840.87 Mg C. Also, the highest stock of C appears in vegetation area far from water. Also, the C stock spatial distribution for aboveground and belowground is presented in Fig. 10. The expansion of cultivated land and urban areas had a slight influence on C storage, as this change in LU/LC has mainly affected wet lawns and the edges of unused land (Kacem et al. 2022). Mekuria (2013) in his study reported that dense forest had higher total C stock followed by open forest, grassland, cultivated land, and bare land. Our results showed that mangroves and sea grasses have large contribution for the total value of the ecosystem as they provide higher amount of C storage and sequestration. Our study reveals that there is no C in open water area, where the positive change in C is very low that appears in vegetation and mangroves areas. Thus, our results recommend conserving the vegetated areas for sustaining C stock.
According Abd El-Hamid and Hafiz 2022, human disturbances are causing an ongoing decline in total carbon sequestered, which will eventually harm ecosystem services and have an impact on human health.
The total cost of C stock decreased from 2009 to 2013 and increased from 2013 to 2021. Also, the transition cost of C using three different discount modeling agrees with change in LU/LC as shown Table 6. Our findings are similar to those of Sil et al. (2017), who reported that the value of C sequestration with a different C price flocculated from a minimum of US$ 13.5 ha− 1 yr− 1 when converting forest to grassland. Padilla et al. (2010) reported that the intense anthropogenic activities (conversion of forest to human settlement and farmland) would result in a spatial distribution of C sequestration value that varied from a minimum of US$ − 1361.23 ha− 1 yr− 1 to a maximum of US$ 230.43 ha− 1 yr− 1. Our results indicated that even with the limited data available for simulated and current C storage, it could be an acceptable demonstration of C storage in the study area. Finally, Japelaghi et al. 2022 reported that human activities and its consequences which will lead to severe deforestation and at last the reduction of ecosystem services especially storage and the sequestration of carbon.
Study limitations
One of the limitations of our study was the lack of detailed and reliable data on C density in various pools of the studied sites. It is known that the deficiency of accurate data about coastal ecosystem might lead into insufficient results about C stocks in different habitats. Also, the LU/LC change might impact the total estimation of C in the current and upcoming periods.
Conclusion
Studying changes in LU/LC provides vital data for policy decision-making in regard to the future of coastal ecosystem services. Our results indicated that the mangrove habitats were significantly decreased since 2013. Moreover, estimated soil C stocks of Jazan were substantially decreased since 2013 (2827817.84 Mg C), with a total loss of − 4450675.40 Mg C and an average of annual loss of − 1,112,669 Mg C during the study time frame (2013–2021) concluding a net value loss of − 461,240,790.53 US$. Degradation of the ecosystem along the study area might have negative impacts on blue C storage. So, ecosystem conservation should be taken into consideration for reducing C stock loss. Our results showed that the insufficiency of SOC is likely to increase ecosystem C loss due to change in mangroves and sea grasses along the coastal zone of Jazan city. Therefore, our study investigated the current situation of the mangroves and grasses scattered along the coastline, which might provide an opportunity for officials to take the necessary measures to preserve biological diversity to reduce C emissions in the atmosphere and preserve soil C stocks at coastal wetlands.
Data Availability
All data generated or analyzed during this study are included in this published article and its supplementary information files.
Code Availability
Not applicable.
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The authors gratefully acknowledge the contributions of Dr. Amr Keshta who kindly corrected and improved the English of the manuscript.
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“All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by [Hazem T. Abd El-Hamid], [Ebrahem M. Eid] [Mohamed H.E. El-Morsy], [Hanan E.M. Osman] and [Amr E. Keshta]. The first draft of the manuscript was written by [Hazem T. Abd El-Hamid] and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript“.
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El-Hamid, H.T.A., Eid, E.M., El-Morsy, M.H. et al. Benefits of Blue Carbon Stocks in a Coastal Jazan Ecosystem Undergoing Land Use Change. Wetlands 42, 103 (2022). https://doi.org/10.1007/s13157-022-01597-9
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DOI: https://doi.org/10.1007/s13157-022-01597-9