长江口滨海湿地植物群落潮沟水体有机碳动态及其影响因素

费蓓莉; 解丽娜; 李诗华; 陈威; 葛振鸣

doi:10.3969/j.issn.1000-5641.2019.01.017

长江口滨海湿地植物群落潮沟水体有机碳动态及其影响因素

doi: 10.3969/j.issn.1000-5641.2019.01.017

费蓓莉^1,2,
解丽娜^1,2,
李诗华^1,2,
陈威^1,2,
葛振鸣^1,2, ,

1.
华东师范大学河口海岸学国家重点实验室, 上海 200241
2.
华东师范大学崇明生态研究院, 上海 200241

基金项目:

国家自然科学基金 41871088

国家自然科学基金 41571083

国家重点研发计划 2016YFE0133700

国家重点研发计划 2017YFC0506001

国家重点实验室自主课题 2015KYYW03

详细信息

作者简介:
费蓓莉, 女, 硕士研究生, 研究方向为湿地生态学

通讯作者:
葛振鸣, 男, 研究员, 博士生导师, 研究方向为湿地生态学.E-mail:zmge@sklec.ecnu.edu.cn

中图分类号: P933
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- 文章访问数: 72
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- PDF下载量: 157
- 被引次数: 0
出版历程
- 收稿日期: 2017-10-30
- 刊出日期: 2019-01-25

Variations in organic carbon and its impact on tidal creeks within vegetation communities in the coastal wetlands of the Yangtze Estuary

FEI Bei-li^1,2,
XIE Li-na^1,2,
LI Shi-hua^1,2,
CHEN Wei^1,2,
GE Zhen-ming^{1,2
, ,}

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
2.
Institute of Eco-Chongming, East China Normal University, Shanghai 200241, China

摘要

摘要: 潮沟系统是滨海湿地与外界环境之间横向碳交换的重要通道.本研究以长江口滨海湿地典型植物群落（禾本科Poaceae和莎草科Cyperaceae）为研究对象，调查了不同潮汐（小潮期与大潮期）退潮过程中潮沟水体可溶性有机碳（DOC）和颗粒态有机碳（POC）的季节变化.结果表明，潮水向外输出的过程中，DOC和POC从高潮滩到口外浅水光滩均逐渐变化，大潮期时不同生境潮沟的有机碳丰度一般比小潮期高.在具有较高植物生物量和土壤有机碳储量的Poaceae群落中，各季节潮沟水体DOC含量均显著高于Cyperaceae生境潮沟；相反，各季节Cyperaceae群落潮沟POC含量则高于Poaceae群落潮沟.此外，Poaceae群落潮沟在各季节均表现为DOC净输出，而POC为净输入，各季节DOC和POC在Cyperaceae群落潮沟均呈现净输出趋势.
- 潮沟系统 /
- 有机碳 /
- 季节变化 /
- 植被类型 /
- 潮汐
Abstract: Tidal creeks are identified as an important pathway for carbon exchange between coastal wetlands and the adjacent environment. This study investigated the seasonal variations in dissolved organic carbon (DOC) and particulate organic carbon (POC) in tidal creeks within typical vegetation communities (Poaceae and Cyperaceae) in the coastal wetlands of the Yangtze Estuary. The results showed that during ebb the concentrations of organic carbon components changed gradually along the altitude gradient from high marsh to low-lying shallow water areas outside the creeks. Generally, spring tides increased the organic carbon abundance in both creeks, relative to neap tide. In the Poaceae creek, with high plant biomass and soil carbon stocks, the DOC concentrations were significantly higher compared to the Cyperaceae creek during ebb across all seasons. In contrast, the POC contents were lower in the Poaceae creek compared to the Cyperaceae creek. The results of this study indicated that the Poaceae creek functioned as a net export (source) of DOC throughout the year but as a net sink of POC, and the Cyperaceae creek functioned as a net source of organic carbon over all seasons.
- tidal creek system /
- organic carbon /
- seasonal variation /
- vegetation type /
- tide

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图 1 崇明东滩湿地和不同植被群落中的潮沟研究地点(包括采样点)

Fig. 1 Location of the Chongming Dongtan wetland and the tidal creeks (with sampling sites) selected in different vegetation communities

下载: 全尺寸图片幻灯片

图 2 小、大潮期退潮时Poaceae群落潮沟沿高程(从P_H到P_out)的DOC和POC含量变化量(平均值±标准误)

注: A为春季, B为夏季, C为秋季, D为冬季

Fig. 2 Variations in DOC and POC concentration (mean± S.E.) along the altitude (from P_H to P_out) of creeks in the Poaceae community during a neap and spring ebb tide

下载: 全尺寸图片幻灯片

图 3 小、大潮期退潮时Cyperaceae群落潮沟沿高程(从C_H到C_out)的DOC和POC含量变化量(平均值±标准误)

注: A为春季, B为夏季, C为秋季, D为冬季

Fig. 3 Variations in DOC and POC concentration (mean± S.E.) along the altitude (from P_H to P_out) of creeks in the Cyperaceae community during a neap and spring ebb tide

下载: 全尺寸图片幻灯片

图 4 小、大潮期退潮时Poaceae和Cyperaceae群落潮沟DOC和POC含量差异(平均值± \\标准误)

注: 数据为P_H, P_M和P_L采样点的均值, 以及C_H, C_M和C_L采样点的均值; 不同小写字母代表差异性达到显著水平(p＜0.05

Fig. 4 Differences in DOC and POC concentration (mean± S.E.)between vegetated creeksof the Poaceaeand Cyperaceae communities during a neap and spring ebb tide

下载: 全尺寸图片幻灯片

图 5 邻近潮沟的Poaceae和Cyperaceae群落植物生物量和土壤有机碳储量(平均值±标准误)

注: 不同小写字母代表差异性达到显著水平(p＜0.05)

Fig. 5 Biomass and SOC stocks (mean± S.E.) in the Poaceae and Cyperaceae communities neighboring the creeks

下载: 全尺寸图片幻灯片

图 6 Poaceae和Cyperaceae群落植物总生物量季节变化与邻近潮沟DOC和POC含量的线性关系

注: 数据(平均值±标准误)为P_H, P_M和P_L采样点的均值，以及C_H, C_M, 和C_L 采样点的均值; *表示显著水平p<0.05

Fig. 6 Linear relationship between the seasonal total biomass of Poaceae and Cyperaceae species and DOC and POC concentration in the neighboring vegetated creeks

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表 1 潮沟水样采集时间、潮汐类型和当日最高潮位

Tab. 1 Date of sampling from the creeks and information on the associated tide regime and maximum tide level

季节	采样时间	潮汐类型	最高潮位/m
春季	3月1日-2日	大潮	4.14
春季	3月19日-20日	小潮	3.23
夏季	7月15日-16日	小潮	3.18
夏季	8月22日-23日	大潮	4.65
秋季	10月18日-19日	大潮	4.14
秋季	10月25日-26日	小潮	2.67
冬季	12月23日-24日	小潮	3.16
冬季	12月30日-31日	大潮	4.00

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