广东省红树林土壤碳储量及固碳潜力研究

Soil Carbon Stock and Potential Carbon Storage in the Mangrove Forests of Guangdong

利用文献收集和数据整合的方法,对广东省不同红树林群落和地区的碳储量及碳埋藏速率进行了系统梳理。研究发现,广东省红树林的面积为9106.21 hm^(2),土壤碳储量为1542.02 GgC,土壤碳密度为0.23 Gg C/hm^(2)。广东省内红海榄(Rhicophora stylosa)和木榄(Bruguiera gymnorrhiza)群落的土壤碳密度最高,分别是0.27和0.23 Gg Chm',而秋茄(Kandelia candel)群落土壤碳密度最低,仅为0.13 Gg Chm^(2)。广东13个沿海地市的红树林:土壤碳储量按大小顺序为湛江(894.5 GgC)>阳江(195.4GgC)>江门(97.7GgC)>珠海(91.0 GgC)>茂名(59.6GgC)>汕头(51.4GgC)>中山(49.2GgC)>惠州(36.1GgC)>广州(35.1 GgC)>深圳(18.3GgC)>汕尾(10.8GgC)>东莞(2.8GgC)>潮州(0.11 GgC)。基于"”Pb测年法,广东省各地区红树林的平均沉积速率为13.5 mm/a,淇澳岛的沉积速率最高,为31.5 mm/a;其次是镇海湾16.5 mm/a,深圳福田15.9 mm/a;雷州湾的沉积速率最低,仅为7.3 mm/a.碳埋藏能力方面,广东省碳埋藏能力约为19.72 Gg Cla,其中雷州半岛的碳埋藏能力最高为6.05 Gg C/a,而深圳福田的碳埋藏能力最低,仅为0.66 GgC/a。综上,目前广东省红树林碳储量相对较低,但具有较高的固碳潜力,加强对当地红树林的保护和重建,将有助于充分发挥红树林的生态系统服务功能。

Mangroves occur in coastal intertidal zones and play an important role in terrestrial and marine carbon cycles.Accurate estimations of mangrove carbon stocks and sequestration potential can help quantify the contribution of mangroves to addressing climate change and achieving carbon neutrality goals.The carbon stocks and burial rates of different mangrove communities and regions in Guangdong Province were studied through literature collection and data integration.The soil carbon densities of the Rhizophora stylosa and Bruguiera gymnorhiza communities were 0.27 and 0.23 Gg C/hm^(2),respectively,while the soil carbon density of the Kandelia obovata community was the lowest at only 0.13 Gg C/hm^(2).The area of mangroves in Guangdong Province is 9,106.2 hm',the total carbon stock is 1,542.02 Gg C,and the soil carbon density is 0.23 Gg C/hm^(2).The total carbon reserves of mangroves in thirteen regions are in the following order:Zhanjiang(894.5 Gg C)>Yangjiang(195.4 Gg C)>Jiangmen(97.7 Gg C)>Zhuhai(91.0 Gg C)>Maoming(59.6 Gg C)>Shantou(51.4 Gg C)>Zhongshan(49.2 Gg C)>Huizhou(36.1 Gg C)>Guangzhou(35.1 Gg C)>Shenzhen(18.3 Gg C)>Shanwei(10.8 Gg C)>Dongguan(2.83 Gg C)>Chaozhou(0.11 Gg C).Using the“"Pb method,the sediment accretion rate was found to be 13.47 mm/a.Qi'ao Island had the highest sediment compaction rate of 31.5 mm/a,followed by Zhenhai Bay,with 16.5 mm/a,Shenzhen Futian,with 15.9 mm/a,and Leizhou Bay,with the lowest sediment compaction rate of 7.3 mm/a.The carbon sequestration capacity of Guangdong province is approximately 19.72 Gg C/a,with the Leizhou Peninsula having the highest(6.05 Gg C/a)and Futian,Shenzhen having the lowest(0.66 Gg C/a)capacities.The carbon storage of mangroves in Guangdong Province was 1,542.02 Gg C,which was higher than that in other regions.The carbon sequestration capacity of the mangroves was relatively strong.Therefore,the protection and restoration of local mangroves may substantially contribute to the mitigation of climate change while providing additional benefits.This assessment,on a provincial scale,provides insights into blue carbon sequestration capacity,thus contributing to the synchronous progression of bluc carbon management.