Carbon Sink under Different Carbon Density Levels of Forest and Shrub, a Case in Dongting Lake Basin, China
Carbon Sink under Different Carbon Density Levels of Forest and Shrub, a Case in Dongting Lake Basin, China
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不同碳密度水平下森林和灌木的碳汇——以中国洞庭湖流域为例
DOI：
10.3390/rs14112672
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发表时间：
2022-06-01
期刊：
影响因子：
5
通讯作者：
Ouyang, Zhiyun
中科院分区：
文献类型：
--
作者：
Kong, Lingqiao;Lu, Fei;Ouyang, Zhiyun
陆地生态系统在全球碳循环和减缓气候变化方面发挥着关键作用。研究区域尺度上碳汇的时空动态及其驱动机制，为生态恢复和生态系统管理提供重要依据。以洞庭湖流域为例，基于遥感获取的生物量图，对2000 - 2020年洞庭湖流域森林和灌木碳汇进行了评估，并分析了20年来不同生物量碳密度水平的固定林、灌木和新造林对洞庭湖流域碳汇的贡献。结果表明：2000 - 2020年洞庭湖流域森林和灌木碳汇增长迅速，碳汇由2000 - 2010年的64.64 TgC增加到2010 - 2020年的382.56 TgC。生物质碳密度的不断提高对碳汇贡献较大，尤其是低碳密度森林和灌木林的碳密度增加。碳密集森林和灌木在第一个十年表现为负碳汇后，在第二个十年实现了对碳汇的贡献。从第一个十年到第二个十年，新造林碳汇增加了61.16%，但贡献比例有所下降。洞庭湖流域森林和灌丛的整体低碳密度及其碳汇动态显示了其巨大的固碳潜力。除了继续实施森林保护和恢复工程，促进植树造林外，对于洞庭湖流域这样的生态系统严重退化但重要而脆弱的地区，在生态系统管理中应更加重视生态系统质量的改善，以实现其巨大的碳汇潜力。
Terrestrial ecosystems play a critical role in the global carbon cycle and climate change mitigation. Studying the temporal and spatial dynamics of carbon sink and the driving mechanisms at the regional scale provides an important basis for ecological restoration and ecosystem management. Taking the Dongting Lake Basin as an example, we assessed the carbon sinks of forest and shrub from 2000 to 2020 based on the maps of biomass that were obtained by remote sensing, and analyzed the dynamics of carbon sinks that were contributed by different biomass carbon density levels of constant forest and shrub and new afforestation over the past two decades. The results showed that the carbon sink of forest and shrub in the Dongting Lake Basin grew rapidly from 2000 to 2020: carbon sink increased from 64.64 TgC between 2000 and 2010, to 382.56 TgC between 2010 and 2020. The continuous improvement of biomass carbon density has made a major contribution to carbon sink, especially the carbon density increase in low carbon density forests and shrubs. Carbon-dense forests and shrubs realized their contribution to carbon sink in the second decade after displaying negative carbon sink in the first decade. Carbon sink from new afforestation increased 61.16% from the first decade to the second decade, but the contribution proportion decreased. The overall low carbon density of forest and shrub in the Dongting Lake Basin and their carbon sink dynamics indicated their huge carbon sequestration potential in the future. In addition to continuously implementing forest protection and restoration projects to promote afforestation, the improvement of ecosystem quality should be paid more attention in ecosystem management for areas like Dongting Lake Basin, where ecosystems, though severely degraded, are important and fragile, to realize their huge carbon sequestration potential.