Vegetation growth characteristics and the blue carbon effect ofrestored salt marshes at different developmental agesin Hengsha, the Yangtze River Estuary

doi:10.3969/j.issn.1000-5641.2024.01.012

Abstract

Abstract:

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.

Key words: newly restored wetlands, salt marsh vegetation, soil organic carbon, carbon density, blue carbon

CLC Number:

Q148

Xiaohan ZHANG, Huimin TIAN, Xuechu CHEN, Hualei YANG, Rui DING, Mingming ZHAO, Wenhui YOU. Vegetation growth characteristics and the blue carbon effect ofrestored salt marshes at different developmental agesin Hengsha, the Yangtze River Estuary[J]. Journal of East China Normal University(Natural Science), 2024, 2024(1): 113-121.

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	株高	密度	盖度	地上生物量	地下生物量	根冠比	有机碳含量
株高	1
密度	–0.307	1
盖度	0.566	0.462	1
地上生物量	0.951**	–0.288	0.634*	1
地下生物量	0.941**	–0.230	0.461	0.836**	1
根冠比	0.174	–0.086	0.383	0.380	–0.125	1
有机碳含量	0.869**	–0.094	0.506	0.846**	0.863**	0.141	1

	含水率	孔隙度	电导率	盐度	粒径	pH值	有机碳含量
含水率	1
孔隙度	0.989**	1
电导率	0.761**	0.713**	1
盐度	0.338	0.269	0.841**	1
粒径	–0.947**	–0.971**	–0.657*	–0.226	1
pH值	–0.755**	–0.818**	–0.257	0.249	0.845**	1
有机碳含量	0.852**	0.843**	0.372	–0.051	–0.796**	–0.768**	1

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