Ecological spatial network optimization of carbon sink patches for enhanced carbon sink in Wuhan Metropolitan Area, China
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Achieving carbon neutrality through increasing carbon sinks is a crucial strategy for reaching long-term climate objectives. During rapid urbanization, the degradation of vegetation structure and quantity in fragmented patches leads to the reduction of the carbon sink capacity. Establishing the well-design ecological spatial network is crucial for improving the carbon sink capacity. This study focuses on enhancing the carbon sink capacity in the Wuhan Metropolitan Area (WMA) through a four-step approach–identification, construction, assessment, and optimization–to improve the ecological spatial structure of carbon sink patches and increase carbon sink capacity. The results show that we initially built 27 carbon sink patches and 52 networks, prioritizing 15 core networks. Due to the low connectivity between the Western and other regions, we added 18 steppingstones and 12 networks to enhance overall connectivity and stability of spatial network. Verification shows that our scheme benefits the connectivity and stability of whole ecological network of WMA, and increases the total carbon sink by 11.17 Mt CO2. This research enriches methods for increasing carbon sinks in urban areas and provides theoretical support for achieving carbon neutrality.Keywords:
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The dynamic change in the carbon sink value of the Heidaigou opencast mining area in the Inner Mongolia Autonomous Region of China was analyzed by remote sensing and geographical information system to investigate the effect of land rehabilitation and ecological reconstruction in mining area on the biogeochemical cycle of carbon. The mining area's carbon sink volume and value from 1987 to 2010 were calculated according to carbon sink capacity differences across various vegetation and land use types. The results indicate the following conclu- sions. (1) The carbon sink volume and value decreased by 17 % over 23 years, from 7,217,104.59 t and $1,082.57 million to 5,990,016.2 t and $898.50 million, respectively. (2) Assuming a dump is rehabilitated with 20 % woodland and 80 % grassland, the carbon sink volume and value can increase to 6,593,952.5 t and $989.09 million, respectively. The value would increase by 10.08 % after land rehabili- tation. (3) Assuming that other industrial land is rehabili- tated with grassland after the dumps are completely rehabilitated, the carbon sink volume and value would increase to 6,742,684.36 t and $1011.40 million, respec- tively. The value would increase by 12.57 % after land rehabilitation. The results indicate that land rehabilitation and ecological reconstruction can increase mining area carbon sinks and produce ecological and economic benefits. This study provides a new perspective on land rehabilitation and ecological reconstruction.
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Atmospheric and ground-based methods agree on the presence of a carbon sink in the coterminous United States (the United States minus Alaska and Hawaii), and the primary causes for the sink recently have been identified. Projecting the future behavior of the sink is necessary for projecting future net emissions. Here we use two models, the Ecosystem Demography model and a second simpler empirically based model (Miami Land Use History), to estimate the spatio-temporal patterns of ecosystem carbon stocks and fluxes resulting from land-use changes and fire suppression from 1700 to 2100. Our results are compared with other historical reconstructions of ecosystem carbon fluxes and to a detailed carbon budget for the 1980s. Our projections indicate that the ecosystem recovery processes that are primarily responsible for the contemporary U.S. carbon sink will slow over the next century, resulting in a significant reduction of the sink. The projected rate of decrease depends strongly on scenarios of future land use and the long-term effectiveness of fire suppression.
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Carbon sink becomes a scarce resource and causes a high attention by the signing of Kyoto Protocol.Forward-looking countries and regions should be aware of the prospects for the development of carbon sink industry.In this paper we defined the concept of carbon sink industry,and used essence theory of forests,carbon density method,Li and T.O.West methods to estimate Inner Mongolia's forest,grassland,farmland carbon sinks resources.In 2003 there were 17.2×108 tons of carbon,and in 2009 were 18.1×108.The potential for industrial development of Carbon sink in Inner Mongolia was analysed and the specific strategies and recommendations were proposed.
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First analyzed Some problems in our Forestry carbon sink trade field,and thought these problems are induced essentially by the informational incompletion.Then it introduced the function of the information system of the forestry carbon sink which based on web and regarded the system as a good way to solve these problems. And finally analyzed roundly the flow chart of China forestry car bon sink projects ,and set its goal based on the needs of all participator in the projects,combined information technology with the forestry carbon sink ,and put forward a way to resolve the problem in this field.
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The capacity of carbon sink of Nuozadu nature reserve is calculated by using the data of relevant forest resources,and the carbon sink of the reserve is assessed also.The carbon sink capacity of Nuozadu nature reserve is 7,412,600 ton and the forest and the forest land play decisive roles in carbon sink process.
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Durban climate conference decided to continue the second commitment period of the Kyoto protocol, and announced to start Green Climate Fund, which provided great opportunities for the rapid development of the carbon trading market. The problem of grassland carbon sink has already received more and more attention from the countries all over the world, and the grassland carbon sink potential and value also got more attention from people. Xilinhot has abundant grassland resources and it is one of the main grasslands in Inner Mongolia. The huge carbon sink has important ecological function and also contains huge economic benefits. Based on the principle of additionality, this paper proposed the method of calculating the carbon sink potential of grasslands, and calculated and analyzed the carbon sink potential of degraded grasslands in Xilinhot. The results indicated that the existing huge carbon sink potential of Xilinhot grasslands was 0.733-0.869Tg C/a. According to the carbon sequestration cost price of afforestation cost method (260.9 RMB yuan / ton C), we estimated the value of grassland carbon sink was 191.2 - 226.7 million RMB yuan / year in Xilinhot.
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It is increasingly commonly suggested that grasslands are a perpetual sink for carbon, and that just maintaining grasslands will yield a net carbon sink. I examine the evidence for this from repeated soil surveys, long term grassland experiments and simple mass balance calculations. I conclude that it is untenable that grasslands act as a perpetual carbon sink, and the most likely explanation for observed grassland carbon sinks over short periods is legacy effects of land use and land management prior to the beginning of flux measurement periods. Simply having grassland does not result is a carbon sink, but judicious management or previously poorly managed grasslands can increase the sink capacity. Given that grasslands are a large store of carbon, and that it is easier and faster for soils to lose carbon that it is for them to gain carbon, it is an important management target to maintain these stocks.
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Forest carbon sink has been admitted worldwide as one of the solution to global climate change. Based on the 7thcontinuous forest inventory data of Guangdong province, we analyzed the best management strategy in non-forest land. We also simulated the changes of total forest carbon sink and annual growth of forest carbon sink, the forest carbon sink of the new forests and the original forests by CO2FIX V3.2 software. The results showed that, new forests got most carbon by considering merchant wood. In all dominant tree species, the strongest capacity of carbon sequestration was Eucalyptus. Forest carbon sink in Guangdong Province has great potential. The total amount of forest carbon sink will reach 692.1 Mt C in 2057 from 172.9 Mt C in 2008, accumulating 519.2 Mt C, with the increase of 10.38 Mt C per year. To 2057, the new forests will accumulate carbon sink about 176.6 Mt C, and the original forests will accumulate forest carbon sink about 342.8 Mt C.
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