Spatiotemporal patterns of different forms of nitrogen in a coastal mangrove wetland invaded by Spartina alterniflora
Spatiotemporal patterns of different forms of nitrogen in a coastal mangrove wetland invaded by Spartina alterniflora
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DOI：
10.1016/j.ecss.2022.108167
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
X. Peng;Xiaoqing Yu;Xingyu Zhai;Xiaofei Gao;Zheng Yu;J. Yang
中科院分区：
文献类型：
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作者：
X. Peng;Xiaoqing Yu;Xingyu Zhai;Xiaofei Gao;Zheng Yu;J. Yang
互花米草的入侵对我国亚热带沿海地区的生态系统功能和生态环境造成了严重影响。然而，对大米草入侵后红树林湿地中不同形态氮的变化规律却知之甚少。在这项研究中，我们比较了空间和时间分布的不同形式的氮有或没有入侵的S。福建九龙江河口滨海湿地的互花米草。结果表明，该湿地氮浓度的变化与主要潮间带植被类型、季节和采样点密切相关。有机氮占沉积氮的大部分，并表现出最高值的红树林区。铵态氮和硝态氮含量在大米草区较高，在红树林较低，夏季达到最大值。总氮浓度受潮位影响显著，涨潮时最高，低潮时最低。入侵S。互花米草显著改变了沉积物中的氮储量，包括总氮、总有机氮、铵态氮和硝态氮的含量.
The invasion by smooth cordgrass (Spartinaalterniflora) has a serious impact on ecosystem function and the ecological environment in the coastal region of subtropical China. However, little is known about the fluctuation of different forms of nitrogen in mangrove wetlands invaded by cordgrass. In this study, we compared the spatial and temporal distribution of different forms of nitrogen with or without invasion byS. alterniflorain a coastal wetland in the Jiulong River estuary, Fujian province, China. The results revealed that the variation of nitrogen concentration in the wetland was closely related to the main intertidal vegetation type, season and sampling location. Organic nitrogen accounted for the majority of the deposited nitrogen and exhibited the highest values in the mangrove zone. The content of ammonium nitrogen and nitrate nitrogen was higher in cordgrass zone and lower in the mangrove, reaching a maximum in summer. Total nitrogen concentration was significantly influenced by the tidal water level which was highest in high tide zone and lowest at low tide. Invasion ofS. alterniflorasignificantly altered nitrogen stocks in the sediment, including the contents of total nitrogen, total organic nitrogen, ammonium nitrogen and nitrate nitrogen.