海洋学研究 ›› 2023, Vol. 41 ›› Issue (1): 55-67.DOI: 10.3969-j.issn.1001-909X.2023.01.005

• 研究论文 • 上一篇    下一篇

杭州湾南岸滨海盐沼碳库的季节性变化

陈一宁1,2(), 张子严1,3, 陈鹭真4, 张家林4, 刘兵1,5, 夏小明1,2, 王欣凯1,2, 蔡廷禄1,2,*()   

  1. 1.自然资源部第二海洋研究所,浙江 杭州 310012
    2.自然资源部海洋空间资源管理技术重点实验室,浙江 杭州 310012
    3.浙江大学 海洋学院,浙江 舟山 316021
    4.厦门大学 滨海湿地生态系统教育部重点实验室 环境与生态学院,福建 厦门 361102
    5.河海大学 港口海岸与近海工程学院,江苏 南京 210098
  • 收稿日期:2022-11-28 修回日期:2022-12-23 出版日期:2023-03-15 发布日期:2023-04-28
  • 通讯作者: 蔡廷禄(1982—),男,高级工程师,主要从事滨海湿地现场观测技术研究,E-mail:caitlu@sio.org.cn
  • 作者简介:陈一宁(1979—),女,浙江省温州市人,研究员,主要从事滨海湿地生物地貌学及碳汇效应研究,E-mail:yiningchen@sio.org.cn
  • 基金资助:
    国家重点研发计划项目(2022YFC3105404);浙江省自然科学基金重大项目(DT23D060007);浙江省自然科学基金重点项目(LZ21D060001)

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

CHEN Yining1,2(), ZHANG Ziyan1,3, CHEN Luzhen4, ZHANG Jialin4, LIU Bing1,5, XIA Xiaoming1,2, WANG Xinkai1,2, CAI Tinglu1,2,*()   

  1. 1. Second Institute of Oceanography, MNR, Hangzhou 310012, China
    2. Key Laboratory of Ocean Space Resource Management Technology, MNR, Hangzhou 310012, China
    3. College of Ocean, Zhejiang University, Zhoushan 316021, China
    4. Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
    5. College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
  • Received:2022-11-28 Revised:2022-12-23 Online:2023-03-15 Published:2023-04-28

摘要:

滨海盐沼的碳库变化可为蓝碳碳汇核算提供依据。为量化短时间尺度(季节到年际尺度)内滨海盐沼碳库的固碳速率,基于高分辨率的地表高程监测系统,于2022年在杭州湾南岸典型滨海盐沼开展了季节性的观测和采样分析。研究结果表明,在观测期间,本地种海三棱藨草和外来种互花米草的生长呈现季节性变化特征,植物生长主要集中在3—9月。就植物碳库的地下部分而言,海三棱藨草固碳量达到11 g C·m-2,互花米草盐沼则较高,为56 g C·m-2。地表高程监测数据表明,海三棱藨草盐沼的沉积速率为12.30 cm·a-1,略低于互花米草盐沼的沉积速率(13.02 cm·a-1)。结合沉积速率与沉积物容重、有机碳含量等数据,可以算得观测期间,海三棱藨草盐沼沉积物碳埋藏速率为460 g C·m-2·a-1,互花米草盐沼沉积物碳埋藏速率为588 g C·m-2·a-1,这两种滨海湿地的碳埋藏速率也具有季节性,在夏、秋季达到高值。结合植物碳库和沉积物碳库结果可知,杭州湾南岸滨海盐沼生态系统具有较高的固碳速率,外来种生态系统固碳速率(644 g C·m-2·a-1)高于本地种生态系统固碳速率(471 g C·m-2·a-1)。在将来的滨海湿地蓝碳管理工作中,需要考虑不同物种之间的差异性。

关键词: 滨海盐沼, 植物, 地表高程, 碳埋藏, 固碳速率

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

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