Characteristics and Accounting of Carbon Sources and Sinks in Chinese Mangrove Ecosystems
The mangrove ecosystem is regarded as a crucial coastal"blue carbon"ecosystem and the characteristics of carbon sources and sinks and their budget are currently a hot topic of research in China on"carbon peaking and carbon neutrality."Through the collection and compilation of relevant domestic and international research and data,this study summarizes the characteristics of carbon sources and sinks,methodologies for carbon accounting,and budgets of carbon sources and sinks in Chinese mangrove ecosystems.Carbon sources and sinks in mangrove ecosystems primarily include vegetation and soil carbon stocks and greenhouse gases.In Chinese mangrove ecosystems,the annual carbon sequestration of vegetation ranges from 4.0×104 to 6.1×104 t C/a,whereas the annual carbon sequestration of soil ranges from 4.4×104 to 9.7×104 t C/a.The total CH4 emissions are approximately 1.0×l03 t C/a and the ecosystem-scale carbon sequestration ranges from 0.7 ×105 to 1.5 ×105 t C/a.Over a 100-year period,CH4 emissions can offset approximately 5％of the net ecosystem productivity in terms of carbon sequestration effects.The net lateral carbon output is 0.5×105 to 1.5× 105 t C/a.Furthermore,the contribution of mangrove carbon sinks to total ecosystem carbon sequestration in China and their challenges have been discussed thoroughly.Future efforts should focus on strengthening mangrove conservation and restoration,actively monitoring carbon sequestration,and ensuring a balance between the carbon sequestration function and other vital ecological services.
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NSTL
万方数据
