Tree biomass and soil carbon stocks of a mangrove ecosystem on the Egyptian-African Red Sea coast

2020 ◽  
Vol 193 (3) ◽  
pp. 239-251 ◽  
Author(s):  
Abdelwahab A. Afefe ◽  
Mohamed S. Abbas ◽  
Amira Sh. Soliman ◽  
Abdel-Hamid A. Khedr ◽  
El-Bialy E. Hatab
Keyword(s):  
Carbon Sequestration ◽  
Organic Carbon ◽  
Carbon Content ◽  
Mangrove Ecosystem ◽  
Organic Carbon Content ◽  
Mangrove Forests ◽  
Tree Biomass ◽  
Mangrove Species ◽  
Carbon Sequestration Potential ◽  
Sequestration Potential

Mangroves are key ecosystems in strategies addressing the mitigation of climate change through carbon storage in several countries around the world. The main objective of this study is to quantify the carbon storage (above- and below-ground) in the biomass and sediment of mangrove forests (Avicennia marina and Rhizophora mucronata), as well as to estimate the carbon sequestration potential in the Gebel Elba Protected Area along the Egyptian–African Red Sea Coast. The mean recorded soil bulk density in both mangrove species was 1.16 g cm–3, while the recorded mean soil organic carbon (SOC) content was 34.95 g C kg–1. The total mean SOC content was statistically higher in A. marina stands (39.66 g C kg–1) than in R. mucronata stands (33.15 g C kg–1 ). The total mean SOC density for A. marina and R. mucronata amounts to 40.60 kg C m–3. We recorded the carbon sequestration rate of mangrove forests in Egypt as 11.36 g C m–2 year–1 and the total carbon sequestration potential as 5.97 Gg C year–1. The average single tree biomass was notably highly variable between different mangrove species and sites, with a total average tree biomass of 164.8 and 43.7 kg tree–1 for A. marina and R. mucronata, respectively. The results show that the average total tree carbon content is 74.3 and 18.0 kg tree–1 for A. marina and R. mucronata, respectively. While the recorded tree below-ground biomass was 54.1 and 32.6 kg tree–1, and above-ground biomass was 110.7 and 11.1 kg tree–1 for A. marina and R. mucronata, respectively. The recorded average biomass per hectare of mangrove was 74997.1 and 22536.8 kg for A. marina and R. mucronata, respectively. Moreover, the average total tree carbon content per hectare was 33782.3 and 9304.7 kg for A. marina and R. mucronata, respectively. However, for Egypt mangroves (525 ha), the total organic carbon content amounts to 17.73 Gg C for biomass and 5.97 Gg C year–1 for soil, with total of 23.7 Gg C of organic carbon content storage in the mangrove ecosystem in Egypt.

scholarly journals Regional simulation of soil organic carbon dynamics for dry farmland in Northeast China using the CENTURY model

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0245040
Author(s):  
Feng Zhang ◽  
Shihang Wang ◽  
Mingsong Zhao ◽  
Falv Qin ◽  
Xiaoyu Liu
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon Content ◽  
Regional Scale ◽  
Organic Carbon Content ◽  
Century Model ◽  
Carbon Sequestration Potential ◽  
Soil Organic Carbon Content ◽  
Sequestration Potential ◽  
Temporal And Spatial

Soil organic carbon content has a significant impact on soil fertility and grain yield, making it an important factor affecting agricultural production and food security. Dry farmland, the main type of cropland in China, has a lower soil organic carbon content than that of paddy soil, and it may have a significant carbon sequestration potential. Therefore, in this study we applied the CENTURY model to explore the temporal and spatial changes of soil organic carbon (SOC) in Jilin Province from 1985 to 2015. Dry farmland soil polygons were extracted from soil and land use layers (at the 1:1,000,000 scale). Spatial overlay analysis was also used to extract 1282 soil polygons from dry farmland. Modelled results for SOC dynamics in the dry farmland, in conjunction with those from the Yushu field-validation site, indicated a good level of performance. From 1985 to 2015, soil organic carbon density (SOCD) of dry farmland decreased from 34.36 Mg C ha−1 to 33.50 Mg C ha−1 in general, having a rate of deterioration of 0.03 Mg C ha−1 per year. Also, SOC loss was 4.89 Tg from dry farmland soils in the province, with a deterioration rate of 0.16 Tg C per year. 35.96% of the dry farmland its SOCD increased but 64.04% of the area released carbon. Moreover, SOC dynamics recorded significant differences between different soil groups. The method of coupling the CENTURY model with a detailed soil database can simulate temporal and spatial variations of SOC at a regional scale, and it can be used as a precise simulation method for dry farmland SOC dynamics.

scholarly journals Compared impact of compost and digestate on priming effect and hydrophobicity of soils depending on textural composition

2019 ◽  
Vol 70 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Amrei Voelkner ◽  
Charlotte Diercks ◽  
Rainer Horn
Keyword(s):  
Carbon Sequestration ◽  
Organic Carbon ◽  
Organic Substance ◽  
Plant Nutrition ◽  
Priming Effect ◽  
Basal Respiration ◽  
Organic Carbon Content ◽  
Microbial Decomposition ◽  
Carbon Sequestration Potential ◽  
Sequestration Potential

Summary Digestates and compost are used as valuable fertilizers in agriculture because of their benefits for plant nutrition and carbon sequestration potential. These amendments are also suspected to interfere negatively with the soil. To compare their relevance for priming effect and hydrophobicity of soils, two amounts of digestate or compost, respectively, were mixed with a homogenized cambic Luvisol and a Podzol. The basal respiration rate (BAS), the repellency index (RI) and organic carbon content (Corg) of pre-dried mixtures were investigated. The podsolic mixture showed quantitative reduction of Corg and increased BAS (this effect was not statistically significant) due to priming effect through microbial stimulation. As a result of enhanced organic substance (OS) protection in the cambic Luvisol mixture, constant amounts of Corg and declined BAS could be detected. The wettability was reduced in both soils: either directly by the supply of amphiphilic components or indirectly by increased incorporation of microbial exudates. This reduction was not statistically significant. Higher contents of available organic compounds in digestates and higher amounts of hydrophobic humic acids in the compost could be assumed to be decisive for generation of hydrophobicity. Also the soil texture controlled the microbial decomposition by higher incorporation of OS in finer pores and contributed to the protection against microbial decay.

Carbon sequestration potential of soils in southeast Germany derived from stable soil organic carbon saturation

2013 ◽  
Vol 20 (2) ◽  
pp. 653-665 ◽  
Author(s):  
Martin Wiesmeier ◽  
Rico Hübner ◽  
Peter Spörlein ◽  
Uwe Geuß ◽  
Edzard Hangen ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon Sequestration Potential ◽  
Carbon Saturation ◽  
Sequestration Potential

scholarly journals Aggregate stability affects carbon sequestration potential of different tropical soils

2018 ◽  
pp. 71-88 ◽  
Author(s):  
Leo Jude Villasica ◽  
Suzette Lina ◽  
Victor Asio
Keyword(s):  
Carbon Sequestration ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Type ◽  
Aggregate Stability ◽  
Tropical Soils ◽  
Soil Types ◽  
Carbon Sequestration Potential ◽  
Sequestration Potential ◽  
Binding Agents

Aggregate stability and carbon (C) sequestration in soils are closely related phenomena. However, high aggregate stability does not always ensure high carbon sequestration to some soil types since other binding agents could dominate other than carbon. Thus, this study aimed to determine the relationship between aggregate stability and carbon sequestration of different tropical soils which basically differ in geology, genesis, and possibly in their dominant aggregating agents. The study selected four representative soil types (Haplic Acrisol, Calcaric Cambisol, Silic Andosol and Haplic Ferralsol) found in Leyte and Samar that were characterized by previous workers. Soil Organic Carbon (SOC) and Aggregate Stability (AS) in dry and wet conditions were quantified using standard procedures. Some pertinent secondary data were also recorded as reference for each soil type. Results revealed that only Silic Andosol showed positive significant correlation (0.93) between aggregate stability and soil organic carbon (SOC). The other soil types showed weak and negative correlation between aggregate stability and SOC; however, their stability revealed a strong positive relationship with inorganic binding agents. Therefore, each soil type reflects a different relationship between aggregate stability in wet condition and SOC and that the variations could be attributed to the differences in the morpho-physical and geochemical nature of the soils. Moreover, SOC is found to greatly influence the aggregate stability in Silic Andosol, thus the soil carbon sequestration potential of this soil type is generally related to its aggregate stability. However, in other soil types like Haplic Acrisol, Calcaric Cambisol, and Haplic Ferralsol, other binding agents like Calcium (Ca) and iron oxides dominate and control the formation and stability of aggregates rather than SOC.

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