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Peatlands, as an important carbon sink, store a large amount of atmospheric carbon that is vulnerable to becoming a carbon emission source due to the disturbance of the peat layer by natural and anthropogenic processes. The Kuan Kreng peat swamp forest is the second largest peatland in Thailand and is in coastal wetland serving for carbon stock in the subsurface. To assess carbon stock in peatland, the thickness and distribution of the peat layer are necessary. This study determines physical and chemical characteristics of the peatlands in the coastal wetland, southern Thailand by conventional core study and geophysical surveys, including ground penetrating radar (GPR) and electrical resistivity imaging (ERI). There is a significant relationship between chemical and physical properties from the peat layer, which is useful to approximately predict the physical properties and peat layers in the geophysical profiles. The resistivity profiles exhibit high resistivity response, peat between 21.9 and 145.0 ohm-m, interpreted as the peat layers in the shallow subsurface. The high resolution GPR profiles provide an average GPR velocity in peat of 0.040 m/ns and a relative dielectric constant of 54.9 for the peat layers. The peat layer is characterized by a high amplitude of reflection in the GPR profiles. The thickness of the peat layers was estimated from the geophysical surveys and the drilling cores having an average thickness of 18 cm. Average values of bulk density (0.19 g/cm3) and TOC (31.18 wt. %) from the drilling core samples are used to calculate the carbon density in the peat layers giving a result of 59.24 Kg C/m3. Hence, the carbon stock at the Kuan Kreng peat swamp forest is estimated at least 7.53 megaton carbon, which is much higher than aboveground biomass carbon in this area. The innumerably high amount of carbon stock could raise awareness of peatland disturbances. [ABSTRACT FROM AUTHOR]

Through this study, we established equations for estimating the standing tree carbon stock based on 24 tree species in multiple size classes in a case study at the Ngao Demonstration Forest (NDF) in northern Thailand. Four hundred thirty-nine wood samples from trees in mixed deciduous forest (MDF), dry dipterocarp forest (DDF), and dry evergreen forest (DEF) were collected using non-destructive methods to estimate aboveground carbon equations through statistical regression. The equations were established based on four criteria: (1) the coefficient of determination (R2), (2) standard error of estimate (SE), (3) F-value, and (4) significant value (p-value, α ≤ 0.05). The aboveground carbon stock (C) equations for standing trees in the MDF was C = 0.0199DBH2.1887H0.5825, for DDF was C = 0.0145DBH2.1435H0.748, for DEF was C = 0.0167DBH2.1423H0.7070, and the general equation for all species/wood density groups was C = 0.017543DBH2.1625H0.6614, where DBH is tree diameter at breast height, and H is tree total height. The aboveground carbon stock in the DDF, MDF, and DEF was 142, 53.02, and 12 tons/ha, respectively, and the estimated aboveground carbon stock in the Mae Huad sector at the NDF was 61 tons/ha. [ABSTRACT FROM AUTHOR]

This study aimed to assess the tree species and density, biomass, carbon stocks, and the value of carbon stocks in a small community forest in Thailand. The research estimated the biomass above and below ground, carbon stocks, carbon dioxide absorption, and the value of carbon stocks using the European Union Allowance (EUA) and US California Carbon Market exchange rates. The conserved forest zone had 14 different tree species and a density of 618 trees per ha, with a total biomass of 68.130 tonnes, 3.204 tonnes of carbon stored, and 91.74 tonnes of carbon dioxide absorbed. The carbon stock value was calculated at € 1,478.08 and $ 965.66, respectively. In contrast, the utilized forest zone had 7 tree species and a density of 46 trees per ha, with a total biomass of 1.584 tonnes, which was equivalent to 1.584 tonnes of carbon stored or 4.50 tonnes of carbon dioxide absorbed. The value of carbon stock in this zone was € 39.78 and $ 60.90, respectively. The total value of carbon stock at the Ban Khum community forest was $ 2,853.14, assuming a 6% annual interest rate and a carbon trading price of $ 50/tonne CO2. [ABSTRACT FROM AUTHOR]

The climate of the world today has changed greatly. This is mainly due to human activity causing large emissions of carbon dioxide (CO2) from the reserve into the atmosphere, which is the main cause of global warming. This research methodology comprised of training for people in the community and local government sector, so they acquired knowledge and understanding of the causes and consequences of global warming. The people will also learn the adjustment toward weather atmosphere, the method in relieving global warming issues with the potential of the community forest as well as tree measurement techniques. The research method was based from the analysis of the carbon stock from the community forest from 3 different methods; which are 1) method of tree measurement by farmers in the community 2) Measurement, Reporting and Verification (MRV) online method, and 3) the application of Geoinformatics Technology (GIT). The research results found that 50 participants in the training session possessed over 80 percent of understanding toward causes and consequences from global warming, adjustment toward the change of weather atmosphere, and way to relieve the severity of global warming issue with a potential of community forest. Participants were also able to learn tree measurement techniques as well as able to record results. The results from the data analysis from the field survey, MRV online tool, and Geoinformatics Technology found that the community forest can complete the process of carbon stock that is equivalent to 5,256.66 tCO2e, 5,061.32 tCO2e, 5,058.01 tCO2e respectively. [ABSTRACT FROM AUTHOR]

Teak plantations can be a potential source for carbon dioxide absorption and carbon sequestration. Many countries in tropical regions therefore have long started to promoting teak plantations and improving the quality of teak wood as this would evidently lead to higher income. This study aimed to assess the value of carbon offsets in teak plantations for teak plants at the age stages of 21, 22, 24, 25, 26, 28, 30, 31, 33, 34, 35 and 36 years. The assessment showed that teak plantations can create carbon stock in the range between 81.34 and 221.51 tCha-1, which correlates with the age of teak, whilst the net income from carbon offset contracts over a chosen period of 5 years was estimated to be 1,161.71 USD ha-1 (232.342 USD ha-1 annually). The ability to store carbon in teak plantations has been considered highly potential for carbon trading in various markets around the world. [ABSTRACT FROM AUTHOR]

Seagrass ecosystems are important organic carbon (C org) sinks with great potential to contribute to climate change mitigation strategies. However, the high spatial and temporal variability is a barrier to the accurate assessment of national C org stocks. This study provides a national assessment of C org within seagrass meadows, including spatial and temporal variations. The highest C org stocks were within mangrove-associated (44.3 ± 8.27 Mg ha−1), while near-surface sediments were highest in reef-associated meadows (10.20 ± 3.69 Mg ha−1). Regionally, the highest stocks were in the Upper Andaman coast in monospecific meadows (51.7 ± 7.14 Mg ha−1). C org stocks in near-surface sediments were significantly different across historical trends (p < 0.001), with the highest stocks in stable meadows (9.28 ± 3.39 Mg ha−1). The national C org stock within seagrass meadows sediment was 40.45 ± 11.59 Mg C ha−1. The results of this study highlighted the complexity of blue carbon in seagrass meadows and the associated impacts on national C org assessments, carbon accounting, and conservation strategies. [Display omitted] • Sedimentary organic carbon stock highly varies across space and time in seagrass meadows in Thailand. [102] • Highest total organic carbon stock is in mangrove-associated, but near-surface is in reef-associated meadows. [110] • Upper and Lower Andaman have higher sedimentary carbon stocks than the Gulf of Thailand. [89] • Near-surface organic carbon stock is highest in stable meadows, while dynamical ones have similar amounts. [107] • Meadow typology is advisable to be considered in national blue carbon assessments [83] [ABSTRACT FROM AUTHOR]

This study aims to assess the carbon storage capability of dominant vegetative land covers in Thailand by estimating biomass, biomass carbon and soil carbon stocks. Above-ground biomass was estimated from allometric equation or actual raw yield. Soil organic carbon was analyzed according to the Chromic acid titration method. Results show that above-ground biomass carbon for irrigated rice, sugarcane, mature Para rubber, degraded rain forest and mixed deciduous forest were 0.8-1.3, 11.1, 91.5, 56.6 and 60.5 tonne C ha-1, respectively; whereas topsoil carbon at 0-30 cm were 14.9-21.3, 11.3-13.8, 34.2, 54.6 and 77.7-136.9 tonne C ha-1, respectively. Additional studies on the roles of leaf litters involving soil carbon and effects of agricultural practices on carbon storage capability should be considered. Furthermore, advantages of bio-fuel over the lost organic carbon in agricultural systems and decline in crop yield could be also taken into account. [ABSTRACT FROM AUTHOR]

Abstract: Rubber trees provide a variety of raw materials to manufacturing industries. Evaluating the environmental impacts throughout the life cycle of the trees is therefore important. In this study, the carbon stock and greenhouse gas emission profile throughout the complete cropping cycle of rubber plantations was estimated. The amount of biomass carbon stocks per hectare were estimated using a logistic growth model, expressed as 142.47/(1 + 13.31e−0.19t ), where t is rubber age. Using this model, we found that carbon stocks in rubber tree plantations were continuously increasing until the rubber trees reached an age of 22–25 years. On average, the carbon stock in the 25 years of a rubber tree biomass was about 128.4 t C ha−1. Although the carbon stock in latex also increased in a similar way to that of rubber trees, it was much less than that in the biomass of the rubber trees. Based on calculations involving Thailand's total rubber planting area (with various ages of rubber trees), the yearly average carbon stock change was the net increase of 1.71 Mt C y−1. On the other hand the yearly average greenhouse gas emission from cultivation of rubber tree was 0.32 Mt C-e y−1. Compared to the increment of biomass carbon, the carbon emissions from rubber cultivation activities, mainly from fertilizer and herbicide application, were relatively small. [Copyright &y& Elsevier]

The article presents a discussion on evaluating carbon stock of different agricultural land-uses in a sub-watershed of Thailand. A study was conducted focusing on the use of organic carbon pool to increase agricultural sustainability and whether it can be utilized to lessen atmospheric carbon dioxide. A quadrat sampling methodology was implemented to determine biomass and carbon content of 11 different land uses. It was found that about four-fifths of the land will be able to maintain appropriate level of soil carbon.