长江口横沙岛不同发育年限盐沼植被生长特征及其固碳功能差异  

Vegetation growth characteristics and the blue carbon effect of restored salt marshes at different developmental ages in Hengsha,the Yangtze River Estuary

作　　者：张晓涵 田慧敏 陈雪初[1] 杨华蕾[2] 丁睿 赵明明[1] 由文辉[1,3] ZHANG Xiaohan;TIAN Huimin;CHEN Xuechu;YANG Hualei;DING Rui;ZHAO Mingming;YOU Wenhui(School of Ecological and Environmental Sciences,East China Normal University,Shanghai 200241,China;State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China;Institute of Eco-Chongming,Shanghai 202162,China)

机构地区：[1]华东师范大学生态与环境科学学院,上海200241 [2]华东师范大学河口海岸学国家重点实验室,上海200241 [3]崇明生态研究院,上海202162

出　　处：《华东师范大学学报（自然科学版）》2024年第1期113-121,共9页Journal of East China Normal University(Natural Science)

基　　金：上海市科委社会发展科技攻关项目(22dz1202600);上海市海洋局科研项目(沪海科2022-05)。

摘　　要：滨海盐沼湿地因长期淹水而具有较高的生产量和较低的分解率,储蓄了大量的土壤有机碳.随着新恢复盐沼湿地发育年限的增加,其植被生长特性、土壤理化性质与有机碳含量也发生了变化,进而影响到固碳增汇功能.本文以长江口横沙岛新恢复盐沼湿地为例,利用时空代换法,分析新恢复湿地不同发育年限与不同植被群落类型的植被生长性状及土壤有机碳变化情况,并分析影响新恢复湿地固碳能力的关键因子.结果表明:新恢复盐沼湿地在0~20年内有机碳含量随发育年限的增长而增加,且土壤孔隙度和含水率变化可有效指示土壤有机碳的变化;新恢复湿地具有较高的土壤碳密度,发育8年的湿地0~20 cm土层的总有机碳密度为(21.49±3.67)tC·hm^(-2),接近自然湿地;芦苇恢复湿地植被长势和固碳能力高于海三棱藨草和芦苇–海三棱藨草交错群落.Coastal salt marsh wetlands have high productivity and low decomposition rates owing to long-term flooding,and these wetlands store a large amount of soil organic carbon.As newly restored salt marsh wetlands develop,changes in vegetation growth traits,soil physicochemical properties,and organic carbon content affect their carbon sequestration function.In this study,using a restored salt marsh wetland in Hengsha(Chongming,Shanghai)as an example,changes in the vegetation growth characteristics and soil organic carbon content of different vegetation communities at varying developmental ages were analyzed using the spatiotemporal substitution method.Key factors affecting the carbon sequestration capacity of these restored wetlands were also identified.The results showed that the organic carbon content in newly restored salt marsh wetlands increased with developmental age over 0~20 years.Soil porosity and water content were effective indicators of soil organic carbon content changes.The newly restored wetlands had a high soil carbon density,with a total organic carbon density of(21.49±3.67)tC·hm^(-2) in the 0~20 cm soil layer of the eight-year-old wetland,similar to that of the natural wetland.The vegetation growth and carbon sequestration capacity of Phragmites australis were higher than those of Scirpus mariqueter and their ecotone.

关 键 词：新恢复湿地 盐沼植被 土壤有机碳 碳密度 蓝碳 

分 类 号：Q148[生物学—生态学]