长江口盐沼湿地底栖微藻的分布特征及其对有机质产出的贡献

商栩; 管卫兵; 张经

长江口盐沼湿地底栖微藻的分布特征及其对有机质产出的贡献

1.
温州医学院水域科学与环境生态研究所, 浙江温州 325035;华东师范大学河口海岸学国家重点实验室, 上海 200062
2.
上海水产大学海洋学院, 上海200090
3.
华东师范大学河口海岸学国家重点实验室, 上海 200062

基金项目: 教育部“创新团队”计划项目(PCSIRT0427);国家自然科学基金项目(40906072);浙江省自然科学基金项目(Y5090195);温州医学院校科研资助项目(QTJ08003)

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出版历程
- 收稿日期: 2008-09-08
- 修回日期: 2009-07-20

Distribution characteristics and contribution to total primary production of microphotobenthos in the salt marshes of the Changjiang Estuary

1.
School of Environmental Science and Public Health, Wenzhou Medical College, Wenzhou China, 325035 China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
College of Marine Science and Technology, Shanghai Fisheries University, Shanghai 200090, China
3.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

摘要

摘要: 2006年6月(夏季)和12月(冬季)分别对长江口九段沙湿地潮滩底栖微藻的分布状况进行了调查,估算了湿地内各主要初级生产者的生产力并进行了比较。结果显示分布于该盐沼湿地的底栖微藻在光照条件下主要聚集于沉积物表层,形成其生物量随深度增加而迅速减少的垂直分布模式,并随滩面植被盖度从大到小的顺序呈现为:光滩、藨草区、米草区≈芦苇区的水平分布特征。九段沙湿地中单位面积上底栖微藻的生物量远高于上覆水中浮游植物的生物量,其单位面积生产力也显著高于后者,表明底栖微藻在源自单胞藻的湿地有机产出中占有主导地位。九段沙湿地中底栖微藻总生物量远低于地表维管植物,其生物量仅占潮滩初级生产者总生物量的约0.41%,所产出的有机质却达到潮滩总初级生产力约16.53%,意味着这种高营养、易摄取的有机产出有能力成为维持该湿地生态系统的重要食物来源之一。
- 长江口 /
- 底栖微藻 /
- 盐沼湿地 /
- 初级生产力 /
- 九段沙
Abstract: The observation of vertical and horizontal distribution of microphytobenthos (MPB) living on tidal flats, and the estimate of the contribution of the dominant primary producers to total primary production have been carried out in the Jiuduansha salt marshes of the Changjiang Estuary in June (summer) and December (winter) of 2006.MPB concentrate on the surface of the sediments under illumination, and its biomass decrease rapidly with depth. Significant variations of chlorophyll a concentrations in the surface sediments are found between tidal flats covered by different vegetations, following the sequence of bare flat > Scirpus mariqueter region > Spartina alterniflora region ≈ Phragmetis australis region. The biomass and production of MPB are much higher than phytoplankton in the overlaying water column, indicating MPB dominate the algal production in these salt marshes. Although the biomass of MPB are much lower than vascular plants, and only account for 0.41% of total biomass of primary producers in Jiuduansha, MPB contribute 16.53% of total primary production to the ecosystem here.Considerable production of MPB makes this nutritious and digestible producer may play an important role in maintaining this salt marsh ecosystem.
- Changjiang Estuary /
- microphytobenthos /
- salt marsh /
- primary production /
- Jiuduansha

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