Seasonal variation in coastal saltmarsh carbon stocks, south bank of Hangzhou Bay

doi:10.3969-j.issn.1001-909X.2023.01.005

Abstract

Abstract:

Carbon stock variation observation forms the basis for coastal saltmarsh blue carbon sink accounting. In order to accurately estimate the carbon sequestration rate of coastal saltmarshes over a short-term scale (seasonal to annual), this study carried out field observations and sample collections within a coastal saltmarsh on the south bank of Hangzhou Bay, covering different seasons of 2022. This study was primarily based on high-resolution surface monitoring by Surface Elevation Table (SET) systems. The results revealed a seasonal plant growth pattern between March and September for both the native species Scirpus mariqueter and the exotic species Spartina alterniflora. In terms of belowground biotic carbon stock changes, over the growing season, the carbon stock increase for Scirpus mariqueter reached 11 g C·m^-2 whilst this value was 56 g C·m^-2 for Spartina alterniflora. The SET data indicated a sedimentation rate of 13.02 cm·a^-1 within the Spartina alterniflora saltmarsh, higher than that of the Scirpus mariqueter saltmarsh, 12.30 cm·a^-1. Calculating the sedimentation rate data with sediment bulk density and organic carbon content, the sediment carbon accumulation rate of Scirpus mariqueter saltmarsh was estimated to be 460 g C·m^-2·a^-1, lower than 588 g C·m^-2·a^-1 of the Spartina alterniflora saltmarsh. Combining the biotic carbon stock increase and sediment carbon stock increase, the carbon sequestration rate for the Spartina alterniflora saltmarsh was found to be 644 g C·m^-2·a^-1, higher than the value of Scirpus mariqueter saltmarsh, 471 g C·m^-2·a^-1. Thus, the difference in carbon sequestration abilities of native and exotic species should be considered for future coastal blue carbon management.

Key words: coastal saltmarsh, vegetation, surface elevation, carbon accumulation, carbon sequestration rate

CLC Number:

Q948

CHEN Yining, ZHANG Ziyan, CHEN Luzhen, ZHANG Jialin, LIU Bing, XIA Xiaoming, WANG Xinkai, CAI Tinglu. Seasonal variation in coastal saltmarsh carbon stocks, south bank of Hangzhou Bay[J]. Journal of Marine Sciences, 2023, 41(1): 55-67.

Figures/Tables 6

Fig.1 Study area and the site locations for fieldwork deployment

Tab.1 Measured parameters for coastal saltmarsh carbon stock changes

监测内容	监测指标	监测方式
植物碳库增量	植物地上生物量	现场监测、现场采样、室内分析
	植物地下生物量
	植物有机碳含量
沉积物碳库增量	地表高程	现场采样、室内分析
	沉积物有机碳含量
	沉积物容重

Fig.2 The results for vegetation surveys within the Scirpus mariqueter saltmarsh

Fig.3 The results for vegetation surveys within the Spartina alterniflora saltmarsh

Fig.4 The results for sediment bulk density and organic matter content within the Scirpus mariqueter saltmarsh and the Spartina alterniflora saltmarsh

Fig.5 The results for sediment surface elevation changes and sediment organic carbon accumulation within the Scirpus mariqueter saltmarsh and the Spartina alterniflora saltmarsh

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