| 蟹类底栖动物对河口潮滩无机氮界面交换的影响 |
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| 引用本文： | 刘 杰,陈振楼,许世远,王东启,郑祥民.蟹类底栖动物对河口潮滩无机氮界面交换的影响[J].海洋科学,2008,32(2):10-16. |
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| 作者姓名： | 刘 杰 陈振楼 许世远 王东启 郑祥民 |
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| 作者单位： | 华东师范大学,资源与环境科学学院,地理信息科学教育部重点实验室,上海,200062 |
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| 基金项目： | 国家自然科学基金
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国家自然科学基金
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上海市科委资助项目
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上海市重点基础研究项目
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教育部优秀青年教师资助计划 |
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| 摘 要： | 以长江河口的沿岸及岛屿潮滩高潮滩湿地为研究区域,结合现场调查和实验室模拟分析,初步研究了大型穴居底栖动物无齿相手蟹(Sesarma denaan)活动对长江口潮滩沉积物-水界面无机氮交换以及界面处氮的生物地球化学循环的影响。结果表明,高潮滩蟹类底栖动物活动对潮滩滩面地貌施加了显著的改造作用,蟹类活动较集中的地段,蟹洞覆盖率达到2%~3%,滩面掘出沉积物高达1~1.5 kg/m2。潮水淹没情况下,小范围内高密度的蟹类活动能通过机体排泄、加强沉积物再悬浮及促进沉积物-水界面溶质交换等方式致使沉积物出现三态无机氮的巨大释放。蟹类活动造成的洞穴结构及对沉积物的翻动混合能增加沉积物中的氧气含量,促进沉积物中有机氮的矿化和NH4 的释放,造成无机氮在沉积物中的剖面分布特征发生较大变化。
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| 关 键 词： | 长江口 潮滩沉积物 蟹类底栖动物 无机氮 影响 |
| 文章编号： | 1000-3096（2008）02-0010-07 |
| 收稿时间： | 2005-03-14 |
| 修稿时间： | 2005-09-17 |
Impacts of burrowing crab on the dissolved inorganic nitrogen exchange at the sediment-water interface in the intertidal flat of the Yangtze estuary |
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| LIU Jie,CHEN Zhen-lou,XU Shi-yuan,WANG Dong-qi,ZHENG Xiang-min.Impacts of burrowing crab on the dissolved inorganic nitrogen exchange at the sediment-water interface in the intertidal flat of the Yangtze estuary[J].Marine Sciences,2008,32(2):10-16. |
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| Authors: | LIU Jie CHEN Zhen-lou XU Shi-yuan WANG Dong-qi ZHENG Xiang-min |
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| Abstract: | The burrowing crabs are important bioturbators of intertidal flats. Selecting the Yangtze estuary coastal and island high tidal flat wetland as a study area, based on the integrated method of field investigation and experimental simulation, the impacts of macrobenthos crab Sesarma denaan sp. activities on the DIN exchange in the sediment-water interface and nitrogen biogeochemical cycling of tidal flat are analyzed and discussed simply in this paper. It is revealed that the burrowing benthos crab activities exert an outstanding reconstruction on tidal flat morphology. For example, in high crab dense zone the cave area accounts for 2%-3% of flat and the dry weight of burrowing mound can reach 1 to 1.5 kg per square meter. When high tidal flat is submerged, intensive crab Sesarma denaan sp. activities can cause a very large release of DIN by virtue of excretion, burrowing, bioturbation and sediment resuspension. Developed cave in sediment and continual turnover of sediment by crab can improve an organic matter remineralization and ammonification, consequently reworking the DIN vertical profile in sediment. |
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| Keywords: | Yangtze estuary intertidal sediments crab DIN impacts |
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