Amount Of Carbon Sequestration Research Articles

Carbon Sequestration of Common Garden Tree Species under the Carbon Neutrality Target in East China

The global warming phenomenon caused by greenhouse gas emission leads to the deterioration of the ecological environment. In urban spaces, the selection of garden tree species with high carbon sequestration rates can effectively contribute to carbon neutrality. In this study, we measured the height, diameter at breast height, and crown width of 643 ancient trees around the West Lake Scenic Spot, Hangzhou, China, and recorded their species and ages. By the biomass expansion factor method, the long-term carbon sequestration of the trees was calculated, and the corresponding statistical analysis indicated the following findings: (1) The maximum carbon sequestration of ancient trees varies with the species; the simple rational function has the best fit for the relationship between mean annual carbon sequestration and age. (2) For the five most common species in the Hangzhou area, the total individual amount of carbon sequestration per tree species can be ranked from high to low as follows: Celtis julianae, Cinnamomum camphora, Castanopsis sclerophylla, Liquidambar formosana, and Ginkgo biloba (tree age < 260 years). The ranking for trees aged above 260 years is as follows: Celtis julianae, Cinnamomum camphora, Liquidambar formosana, Castanopsis sclerophylla, and Ginkgo biloba. (3) The transient and mean annual carbon sequestration rate decreases as tree age increases; for most of the ancient trees in this research, the main growing period is 0–300 years. (4) Castanopsis sclerophylla, Liquidambar Formosana, and Osmanthus fragrans are recommended for urban landscape greening as they provide continuous long-term carbon sequestration and special landscape features.

Estimation of above ground biomass in tropical heterogeneous forests in India using GEDI

Quantifying above ground biomass (AGB) and its spatial distribution can significantly contribute to monitor carbon stocks as well as the carbon storage dynamics in forests. For effective forest monitoring and management in the case of complex tropical Indian forests, there is a need to obtain reliable estimates of the amount of carbon sequestration at regional as well as national levels, but the estimation of biomass is quite challenging. The main objective of the study is to validate the usefulness of the gridded above ground biomass density (AGBD) estimates (ton/ha) of the spaceborne LiDAR Global Ecosystem Dynamics Investigation data (GEDI L4B, Version 2) across two tropical heterogeneous forests in India, Betul and Mudumalai forests. Methodology includes, for each forest area, a linear regression model which predicts AGB from Sentinel-2 MSI data was developed using ground reference data and comparing it with the GEDI AGBD values. The AGB model for the Betul forests in Central India had a RMSE of 13.9 ton/ha, relative RMSE = 8.7% and a R2 of 0.88, with a bias of −0.28 ton/ha, and a comparison between modelled AGB and GEDI gridded AGBD at 1 km resolution show a relatively strong correlation (0.66) and no or little bias. It also found that GEDI AGBD footprint value is underestimated compared to the AGB according to the Sentinel-2 model. For the Mudumalai forest in southern India, the AGB model had an RMSE of 29.1 ton/ha, relative RMSE = 10.8%, and an R2 of 0.79 and a bias of −0.022. The correlation between modelled AGB and gridded GEDI AGBD was 0.84, and GEDI AGBD is underestimated compared to AGB from the Sentinel-2 model. The field values of AGB of Betul lies between 42.2 ton/ha and 238.8 ton/ha and for the Mudumalai forests, the AGB lies between 75.9 ton/ha and 353.6 ton/ha. The results indicates that the GEDI gridded AGBD underestimates AGB, and that the model used to produce the gridded AGBD product needs to be adjusted to provide reliable information on the carbon balance and its changes over time for the type of Indian forests that exists in the two test areas.

Effects of calcium carbide slag on properties and carbon sequestration efficiency of cement pastes mixed under direct CO2 injection conditions

CO2-mixing by directly injecting CO2 into fresh cement-based materials is a burgeoning technology to produce low-carbon cement products. The objective of this study is to investigate the influence of the calcium carbide slag (CCS) content on the properties and carbon sequestration efficiency of cement pastes mixed under direct CO2 injection conditions. The results indicate that the addition of CCS reduced the fluidity of the cement pastes, accelerated the setting process, increased volume shrinkage, and reduced compressive strength. Following the injection of CO2 into the cement pastes, calcium hydroxide (CH) was carbonated to form calcium carbonate (CC) particles which fill the voids in the cement pastes, thereby reducing volume shrinkage and increasing compressive strength. A lower CO2 inflow rate (2 L/min) was more beneficial to the workability of the cement pastes, while a high inflow rate (6 L/min) can lead to insufficient hydration and affect the development of strength. However, a higher CO2 inflow rate was favorable for improving carbon sequestration efficiency. The highest amountof carbon sequestration can be reached at 6.93 %, when the CCS content is 10 % and the CO2 inflow rate is 6 L/min.

The Ballast Effect of Terrigenous Lithogenic Particles From Rivers and Its Influence on POC Fluxes in the Ocean

AbstractLithogenic materials such as terrigenous lithogenic particles (TLP) can efficiently promote the formation and sinking of mineral‐associated marine organic matter, acting as important ballast and potentially playing an important role in the global carbon cycle. To assess the influence of TLP on fluxes of particulate organic carbon (POC) and other biogeochemical cycles, we construct TLP forcing fields based on global riverine suspended sediment data and then apply them to the Community Earth System Model, version 2 (CESM2) modified with the TLP ballasting effect term. Simulations forced by different concentrations of TLP transported in the surface ocean or along the bottom of continental shelves and slopes are conducted. When the TLP transports seaward along the bottom, simulated POC fluxes at 100 and 2,000 m decrease about 11% and 19%, respectively, for the global ocean, and about 9% and 12%, respectively, for the oceanic regions of continental margins. The initial abiotic ballast processes triggered by TLP input increase POC fluxes, causing additional removal and burial of dissolved iron in continental margins. This further enhances the accumulation of macronutrients in the upwelling regions and their advection transport to neighboring subtropical gyres, thus altering regional productivity when simulations reach quasi‐equilibrium. When consider the impacts of TLP in simulations, the simulated POC flux exhibits an increase in subtropical gyres but a decrease in tropical Pacific and mid‐high latitude regions. The present work highlights the importance of TLP in global biogeochemical cycles, suggesting that the amount of carbon sequestration might be overestimated without TLP in models.

Investigations on carbon-sequestration optimization of recycled coarse-aggregate and its effects on concrete performances

Recycled coarse-aggregate (RCA) derived from waste concrete can be re-used for concrete preparation, which is now limited due to its drawbacks such as micro-cracks, high-porosity, and reduced concrete strengths. To remedy these deficiencies, carbon-sequestration was employed to enhance RCA and the conditions were optimized, including the temperature (20 °C–40 °C), pressure (0.1 MPa–0.3 MPa), time (5 h–24 h) and initial water content (25%–75 %). There parameters were optimized based on the orthogonal test with scheme L9(34), which was evaluated based on RCA carbon-sequestration amount as well as its properties. With the optimized parameters, RCA was enhanced as CRCA. Both RCA and CRCA were utilized to fully replace natural coarse-aggregate (NCA) in concrete and concrete basic performances were investigated systematically, including strengths, shrinkage and medium transport properties. The results show that the effects of carbon-sequestration time and initial water-content of aggregate on the carbon-sequestration efficiency of RCA are the most significant. The optimized parameters were 30 °C temperature, 0.3 MPa pressure, 24 h time and 25 % initial water content with the maximum amount of carbon-sequestration at 8.42 %. The carbon-sequestration reduced the width of the recycled aggregate interfacial transition zone (ITZ) in concrete, increased the microhardness of ITZ and mortar, and decreased the porosity of CRCA. The CRCA elevated the compressive strength, splitting tensile strength and flexural strength of the concrete (28d) by 13.5 %, 8.5 % and 7.4 %, respectively. The drying shrinkage at 28d of RCA-concrete was decreased by 12.0 % when RCA was replaced with CRCA, however with the CRCA value still 16.2 % higher than that of NCA-concrete. Moreover, CRCA can decrease the medium transport coefficients of water, chloride, and gas in concrete when compared with the RCA-concrete while they are still greater than those of NCA-concrete.

Achieving coordinated development of multi-functional urban agriculture in Xiamen, China

Urban agriculture's multi-functional coordinated development is an important approach for achieving sustainable development in urban areas. This study developed a comprehensive theoretical framework for evaluating, diagnosing, and optimizing multi-functional urban agriculture by integrating a TOPSIS evaluation model with the coordination degree model and the obstacle degree model. The framework was applied in Xiamen, China to identify the obstacles that impede its coordinated development. Subsequently, four optimized modes for the coordinated development of urban agriculture were proposed. Results showed that: (1) Urban agriculture in Xiamen exhibits the characteristics of "sound social function, moderate economic function, and poor ecological function". (2) The main obstacles affecting the coordination of urban agriculture's multi-function in Xiamen are the average grain crop output, level of agricultural mechanization, arable land carrying capacity, and amount of carbon sequestration. (3) Four optimized development modes for urban agriculture in Xiamen are identified. Through formulating customized strategies that align with the distinctive optimization development mode of each district can promote the sustainable development of urban agriculture in Xiamen. In conclusion, this framework provides a valuable tool for policymakers to explore effective strategies for promoting the multi-functional development of urban agriculture in China and can be expanded to other highly urbanized regions.

Evaluation and economic value of Hedera colchica in urban land management

AbstractCarbon sequestration is the process of capturing, securing and storing carbon dioxide from the atmosphere. In this study, the carbon sequestration capacity of Hedera colchica was investigated in soil of a semiarid region in Iran. Samples were taken from plants cultivated in the semiarid area of the polluted metropolis of Tehran and the amount of sequestered carbon in the aboveground and underground parts of the plant was measured. The conversion coefficient of carbon sequestration of plant organs (stem, leaf, and root) was determined separately by the combustion method. Carbon tax policy was used to evaluate the carbon sequestration function, as the shadow price of carbon. The results showed a significant difference in the amount of carbon sequestration in different organs of the plant. Stems and roots with 29.3 and 4.3 t ha−1, respectively, showed the highest and lowest amount of carbon deposition. The results of the economic value showed that the carbon shadow price was $40567.6 ha−1 on average. In general, the results of this study showed that the organs of H. colchica can have a beneficial effect in the process of carbon sequestration.

Evaluating the Stand Structure, Carbon Sequestration, Oxygen Release Function, and Carbon Sink Value of Three Artificial Shrubs alongside the Tarim Desert Highway

Currently, the ecological problems caused by the greenhouse effect are growing more serious, and implementing carbon sequestration methods is an effective way to address them. Arid and semi-arid desert areas have tremendous potential as carbon sinks, and artificial forests in these areas play an important role in absorbing and sequestering carbon dioxide. This study selected three main species of artificial protective trees along the Tarim Desert Highway—Haloxylon ammodendron (C.A.Mey.) Bunge, Calligonum mongolicum Turcz. and Tamarix chinensis Lour.—and evaluated them for their carbon sequestration, oxygen release capacity, and economic benefits using Pn (net photosynthetic rate) and biomass methods. The results showed that the average daily Pn value and carbon sequestration and oxygen release per unit leaf area of T. chinensis were significantly higher than those of H. ammodendron and C. mongolicum (p < 0.05). The total carbon storage of the three shelterbelts was 15.41 × 104 t, and the carbon storage of H. ammodendron was significantly higher than that of C. mongolicum and T. chinensis (p < 0.05). According to the net photosynthetic rate method, the annual carbon sequestration and oxygen release of the shelter forest is 6.13 × 104 t a−1, and the transaction price is CNY 13.73 million a−1. The total amount of carbon sequestration and oxygen release of the shelter forest obtained via the biomass method is 97.61 × 104 t, and the transaction price is CNY 218.77 million. This study conducted research on the carbon sequestration capacity of protective forests along the Tarim Desert Highway located in an extremely arid region. It highlights the significant contribution of these protective forests in terms of carbon storage, playing a crucial role in promoting ecological restoration and sustainable development in arid areas. Additionally, this study provides a scientific basis for estimating carbon storage and promoting the sustainable management of artificial forests in arid desert regions.

Integrated effects of land use and land cover change on carbon metabolism: Based on ecological network analysis

Faced with increasingly severe climate change, assessing integrated effects of Land use and land cover (LULC) changes on carbon metabolism contributes to the understanding of the mechanism of LULC‑carbon interactions and is crucial to enhance the benefits of anthropogenic emission reductions, increasing regional carbon sinks and formulating future mitigation policies. In this paper, we have developed a hybrid analytical framework that couples natural and socioeconomic systems, and used socioeconomic data, high-resolution remote sensing data, and empirical coefficients to analyze spatiotemporal dynamics of carbon metabolism and applied ecological network analysis (ENA) to evaluate integrated effects of LULC changes upon carbon metabolism. We used Gansu Province, an economically underdeveloped region, as an example for case analysis and policy recommendations. The results showed that: (1) the total carbon emissions in Gansu increased 3.18 times between 1995 and 2020, with transportation and industrial land being the major contributors. The carbon balance status was increasingly severe, and the amount of carbon sequestration to offset carbon emissions decreased from 22.45% in 1995 to 7.11% in 2020. (2) ENA revealed that competition relations between land use types fluctuated up and dominated in 2020, with the mean value of mutualism index was 0.72, which suggested that that integrated effects of LULC changes on whole regional carbon metabolism was negative. Compared to developed regions, the ecological relationships between different land use types in Gansu were more competitive. (3) To address these issues, we have proposed comprehensive policies in terms of adjusting industrial structure, reducing fossil energy use, saving land for construction, and developing carbon sink industries. The study explored the intricate interactions between LULC changes, carbon transition, and regional carbon metabolism in underdeveloped region, and its framework and findings provide insights and recommendations for spatial planning and carbon management in Gansu Province and other regions that may have comparable challenges.

The Carbon Sequestration Potential of Silky Oak (Grevillea robusta A.Cunn. ex R.Br.), a High-Value Economic Wood in Thailand

Silky Oak or Silver Oak (Grevillea robusta A.Cunn. ex R.Br.) is classified as a high-value economic wood in Thailand, it is also considered to be a plant that can grow rapidly, and it has the potential to efficiently reduce greenhouse gases emitted into the atmosphere. This research aimed to study and develop an allometric equation to evaluate the biomass of F1 Silky Oak, which was imported to Thailand from Australia, and grown in Thailand’s economic woods in Silky Oak sites in Pak Chong District, Nakhon Ratchasima Province. The sample group consisted of trees of different ages (i.e., of 2 years, 3–4 years, and 7 years). An allometric equation was used to determine the tree biomass, based on mathematical models that describe the relationship between tree biomass and diameter at breast height (DBH). It was developed in the form of a quadratic equation by multiplying the square DBH by the total height (DBH2 × Ht). Subsequently, the equation was separated into different components, which corresponded with different parts of the tree (i.e., stem, branches, leaves, and roots). The following equations were obtained for the stem: Ws = 0.0721 (D2H) 0.8297 R2 = 0.998. The following equations were obtained for the branches: Wb = 0.0772 (D2H) 0.7027 R2 = 0.977. The following equations were obtained for the leaves, Wl = 0.2085 (D2H) 0.4313 R2 = 0.990. The following equations were obtained for the roots: Wr = 0.3337 (D2H) 0.4886 R2 = 0.957. The results of a laboratory elemental analysis of the carbon sequestration in the biomass, using a CHN elemental analyzer, showed that the mean percentage of carbon content in the stems, branches, leaves, and roots was 45.805. Applying the developed allometric equation for evaluating carbon sequestration, using the survey data from the sample sites of Silky Oak, it was found that the amount of carbon sequestration for the aboveground biomass in three sites was 130.63 tCO2eq. When the amount was converted into carbon dioxide, which was absorbed in the three sites, we obtained a value of 478.99 tCO2eq. The results of the application of the allometric equation showed that there was substantial carbon sequestration potential in the surveyed sites, emphasizing the role of Silky Oak plantations for climate change mitigation and sustainable land management. This study advances our understanding of Silky Oak growth and carbon storage dynamics, offering valuable tools for biomass estimation and promoting environmentally beneficial land use practices.

Forest Assessment and Management Model Based on Carbon Sequestration

Proper forest management activities can sustainably increase forest carbon stocks to mitigate the effects of climate change. In this paper, we combine CBM-CFS3 model to calculate the amount of carbon sequestration and build a forest valuation model, and integrate various factors to obtain the way to maximize the amount of forest value per unit area. At the same time, this paper analyzes the global macroscopic distribution of forest value in the context of forests with typical characteristics and derives a solution for maximizing forest value under the planning of this model in the context of Jiangxi Forest. The model fully considers the ecological, social and economic values of forests to maximize the benefits of forests while sequestering carbon.

Response of Soil Organic Carbon Accumulation in Paddy Fields in Fujian Province to Future Temperature Increases

Understanding the effect of the soil carbon "source-sink" in cropland in China under future warming scenarios is the basis for making reasonable carbon neutralization policies. This study focused on the paddy soil in Fujian Province, a typical subtropical region in China including 84 counties (cities and districts). We employed the 1:50000 soil database and biogeochemical process model (DNDC) to simulate the dynamic changes in paddy soil organic carbon under different warming scenarios for the period of 2017-2053. The results indicated that in the context of normal temperature (control run) and 2, 4, and 6℃ of warming, the total amounts of carbon sequestration of paddy soil in Fujian Province were 11.56,9.44, 7.08, and 4.91 Tg, respectively; accordingly, the average annual carbon sequestration rates (expressed by C) were 173, 141, 106, and 74 kg·(hm2·a)-1, indicating that the rate of carbon sequestration was decreasing with the increase in future temperature. However, overall, the paddy field soil in the province was still a "carbon sink" under the warming of 6 (C. We also found that the gleyed paddy soil was mostly affected by the increase in temperature, and the decrease in carbon sequestration rate ranged from 20% to 69% using different treatments. In contrast, the salinized paddy soil was slightly affected, with a 14%-43% decrease in carbon sequestration rates. As for the different administrative regions, Sanming City was the most affected by temperature increase, with the rate of carbon sequestration decreasing by 27%-83% using different treatments. However, it was reduced by only 10%-41% and 14%-42% in Quanzhou and Putian (coastal areas), respectively. Overall, due to different soil properties, fertilization management, and climatic environment, there was a strong variability in the carbon sequestration rates of paddy soil for different soil subtypes and administrative regions in Fujian in response to future climatic warming.

Estimation of Oil Palm Total Carbon Fluxes Using Remote Sensing

Net primary production (NPP) is one of the approaches used to estimate the amount of carbon sequestration by plants. This research aims to estimate the total carbon flux exchanged from different ages of oil palm using remote sensing. The study site was at the PTPN VI Batang Hari, Jambi, Sumatra, Indonesia. The amount of carbon sequestration by oil palm plantations at PTPN VI Batang Hari, Jambi can be estimated using remote sensing based on the light use efficiency (LUE) model. The results showed that the oil palm age affects the amount of carbon sequestrated. The lowest Net primary production value was found at one year of planting 4.28 gCm-2day-1, and the highest was 9.38 gCm-2day-1 at 20 years of planting. The model LUE output was validated using Eddy covariance data and the results showed a low error and a high accuracy rate with RMSE = 0.05 gCMJ-1, R2 = 92%, and p-value = 0.04. We concluded that the LUE model can be used with high accuracy to estimate the amount of carbon absorption of oil palm when direct measurement is unavailable.

Study on Forest Planning Decision Based on Carbon Sequestration Model

To mitigate the effects of climate change, this paper need to take effective action to reduce greenhouse gases in the atmosphere. From a global perspective, moderate harvesting is beneficial for carbon sequestration, but it is important for forest managers to consider the value of harvested forest products and the value of forest growth for carbon sequestration, and to consider other factors. A model for calculating forest carbon sinks was developed, setting carbon sinks of plants, soils, forest products, and the water environment as primary indicators, and dividing six secondary indicators downward. By quantifying the secondary indicators, the total amount of carbon sequestration is obtained. Second, a complete forest management plan is developed, taking into account other values of the forest. The forest management problem is transformed into a planning problem, and then a particle swarm algorithm is used to solve the forest management planning problem. Trees are not harvested when there are significant differences in biomass at different growth levels and when the value of the forest products exceeds the value of the sustained carbon sink of the trees. The value of forest products is weighed against the value of sustained forest growth to find the transition point, and specific forests and their location characteristics are used to determine the transition point.

Studi Kondisi Lingkungan, Analisis Vegetasi, dan Komponen Ekosistem di Hutan Universitas Diponegoro dan Kebun Pisang Mulawarman

This research was conducted on September 17 2022 in the Diponegoro University Forest and Mulawarman Banana Garden, Semarang. The tools used are raffia rope, scissors, tape measure, ruler, pegs, sticks, digital lux meter, anymetre, stationery and a camera. The materials used were Diponegoro University forest ecosystems and Mulawarman Banana Gardens as objects of observation. The observation method is by making a 20mx25m plot of land, in which a 5mx5m plot is made, and in it a 1mx1m plot is made 3 times. The 20mx25m plot analyzed the number, circumference, diameter, height of trees. 1x1 m plot was made 20cmx20cm plot 5 times, litter thickness was calculated. Plants in a 20m x 25m plot were analyzed for characteristics, biotic and abiotic factors present in Forest Ecosystems and Monoculture Ecosystems. The results of the research on abiotic factors show differences in temperature, humidity, intensity of solar radiation inside and outside the shaded area. The purpose of this research is to understand the difference in the amount of carbon sequestration at the research location.

Evolution Characteristics of Wetland Landscape Pattern and Its Impact on Carbon Sequestration in Wuhan from 2000 to 2020

The wetland ecosystem is an important organic carbon pool on earth, and rich carbon storage and high carbon density are present in wetland vegetation and soil. However, large areas of wetlands have been drained, the area of wetlands has shrunk, and the degree of fragmentation has intensified due to rapid urbanization in the past 20 years. Enhancing ecological carbon sequestration capacity is a key task of carbon peaking and neutrality, and studying the carbon sequestration function of urban wetland is urgently needed. In this work, the wetland in Wuhan was taken as the main research object. The landscape pattern index of Wuhan wetland was calculated and the evolution characteristics of landscape pattern were analyzed using the remote sensing image interpretation data from 2000 to 2020. CASA model was used to estimate the carbon sequestration of wetlands and explore the spatial and temporal distribution pattern of carbon sequestration. Spearman correlation was used to study the effects of different landscape pattern parameters on carbon sequestration. Results indicate the following: (1) From 2000 to 2020, the total wetland area in Wuhan has been reduced by 158.99 km2, among which the area of lakes, reservoirs and marshes decreased by 60.65 km2, 55.51 km2 and 41.77 km2, respectively. The density of wetland patches and the degree of fragmentation and irregularity increased, and the LPI, aggregation degree and diversity decreased. (2) In the past 20 years, the total carbon sequestration amount of wetland in Wuhan first decreased and then increased, among which the carbon sequestration in wetland was the lowest in 2010 (571,900 t). The amount of carbon sequestration in 2020 was the same as that in 2000, reaching 800,000 t. (3) A larger wetland area means more concentrated and denser distribution, more complex shape, more diverse type, and stronger carbon sequestration capacity for Wuhan wetland. On the contrary, the distribution of wetlands becomes more fragmented and regular, and the disordered planning leads to the reduction in wetland types in a unit area, which will decrease the carbon sink capacity of urban wetlands.

Effect of carbonation and foam content on CO2 foamed concrete behavior

Coal and electricity integration plays an important role in ensuring national energy security, but it still faces the challenge of carbon emission reduction. The development of in-situ CO2 sequestration and utilization technology for pithead power plants is an effective way to achieve low-carbon and efficient utilization of coal power. The preparation of foam concrete for mining using CO2 is a type of carbon capture, utilization, and storage technology featuring in-situ CO2 sequestration and utilization in pithead power plants and mine filling and sequestration. The purpose of this study is to evaluate the basic performance and carbon sequestration potential of Portland cement-based CO2 foam concrete (PC-CFC) as a mining material. In this study, PC-CFC was prepared through physical foaming and the carbonation pretreatment cement process. The influence of carbonation pretreatment time and CO2 foam content on density, strength, and carbon sequestration of PC-CFC was investigated. The experimental results showed that carbonation pretreatment could enhance the stability of CO2 foam in Portland cement and improve the CO2 foaming performance. With the extension of carbonation pretreatment time, the extend of dry density reduction decreases from 16.6% to 0.8%. A 60 min–90 min of carbonation pretreatment can achieve the best treatment performance. Carbonation pretreatment and CO2 foam can promote the degree of cement hydration, optimize the PC-CFC pore structure, and improve the compressive strength of PC-CFC. However, the PC-CFC material strength owing to the extended carbonation treatment time, which leads to well-developed vesicle distribution, has an overall decreasing trend. In addition, the 7 day (d) compressive strength of PC-CFC can reach more than 60% of the 28 d compressive strength, which has evident early strength characteristics. Extending the carbonation pretreatment time and CO2 foam content increased the PC-CFC carbon sequestration that ranged from 61.0 kg/ton to 85.7 kg/ton. The dry density of the PC-CFC material was significantly and positively correlated to the 28 d compressive strength and negatively correlated to the amount of carbon sequestration. In the case in which the best carbon sequestration effects is achieved, a single filling of the working face end can store ∼3929.31 kg of CO2; in the most economical condition, it can store ∼3642.79 kg of CO2. The conducted research provides new ideas for the low-carbon and green development of coal and electricity integration.

A Simple Method Using an Allometric Model to Quantify the Carbon Sequestration Capacity in Vineyards.

Winegrapes are an important component of agroecosystems. They are endowed with great potential to sequester and store carbon to slow down greenhouse gas emissions. Herein, the biomass of grapevines was determined, and the carbon storage and distribution features of vineyard ecosystems were correspondingly analyzed using an allometric model of winegrape organs. Then, the carbon sequestration of Cabernet Sauvignon vineyard in the Helan Mountain East Region was quantified. It was found that the total carbon storage of grapevines increased with vine age. The amounts of the total carbon storage in the 5-year-old, 10-year-old, 15-year-old, and 20-year-old vineyards were 50.22 t·ha-1, 56.73 t·ha-1, 59.10 t·ha-1, and 61.06 t·ha-1, respectively. The soil held the majority of the carbon storage, which was concentrated in the top and subsurface layers (0-40 cm) of the soil. Moreover, the biomass carbon storage was mainly distributed in the perennial organs (perennial branches and roots). In young vines, carbon sequestration increased each year; however, the increased rate in carbon sequestration decreased with winegrape growth. The results indicated that vineyards have a net carbon sequestration capacity, and within certain years, the age of grapevines was found to be positively correlated with the amount of carbon sequestration. Overall, the present study provided accurate estimations of the biomass carbon storage in grapevines using the allometric model, which may help vineyards become recognized as important carbon sinks. Additionally, this research can also be used as a basis for figuring out the ecological value of vineyards on a regional scale.

Assessment of change in forests land, carbon stock and carbon emissions of KPK, Pakistan for past three decades using geospatial techniques

Abstract Reducing emissions from deforestation and forest degradation is a mechanism to cut down GHG emissions and protect the threatened forest ecosystems. Pakistan is suffering from high forest degradation and deforestation rates, but recent plantations under BTTAP have created a significant impact. This study was designed to identify the LULC changes, forest sequestration and emissions from forest degradation in the forest hub districts (Malakand, Mardan, Lower Dir and Upper Dir) of KPK, Pakistan using Landsat imageries. LULC changes were analyzed from 1990 to 2020. In addition, the amount of carbon sequestration and emissions from forest degradation were also calculated. Results of the analysis showed forest area reduction from 1990 to 2009, followed by a sharp increase in the next decade (2010–2020) by 56%. Around 836 km2 of land was found to be covered with forests during BTTAP. The net change was a 32% increase in forest land over three decades. The study offers important information which environment managers and decision-makers can utilize to encourage the plantation of trees and save existing forests in the country to combat climate change.

Contribution of different types of terrestrial protected areas to carbon sequestration services in China: 1980–2020

Exploring the contribution of protected areas to carbon sequestration services is meaningful to enhance the role of protected areas in climate change mitigation globally. However, less attention has been paid to the contribution of different types of protected areas to carbon sequestration services as well as their changes, which is not conducive to provide more effective solutions in the context of future climate change. Here, we identified the status and changes of carbon sequestration in different types of terrestrial protected areas in China and calculated the amount of carbon sequestration in different ecosystems in terrestrial protected areas and in different climatic zones. Our results indicated that carbon sequestration of China’s terrestrial protected areas had shown a significant increasing trend over the past 40 years (1980–2020) (R2 = 0.862, p < 0.05). Among the different types of terrestrial protected areas in China, nature reserves had the greatest carbon sequestration, accounting for 64–66% of the carbon sequestration in China’s terrestrial protected areas from 1980 to 2020. Although the carbon sequestration per unit area of forest parks was the highest among all types of protected areas, the proportion of carbon sequestration of forest parks tended to decrease significantly over the past 40 years. Carbon sequestration of protected areas in the humid zone had been mainly contributed by forest ecosystems, while grassland and desert ecosystems in terrestrial protected areas in regions with low rainfall (e.g., semi-arid and arid) had made more contribution to carbon sequestration services. Our study showed that China’s terrestrial protected areas had played an important role in carbon sequestration over the past 40 years, but there are still some gaps compared to the global level, and the planning and establishment of protected areas need to be further strengthened in the future.