【作者】 李万会；

【导师】 丁平兴；

【作者基本信息】 华东师范大学 ， 自然地理学， 2006， 硕士

【摘要】 河口海岸区域物理过程与生态过程相互作用的研究已成为国际河口海岸学研究的一个前沿领域，潮间带底栖微型藻类与表层沉积物相互作用和影响是其中的一个重要研究热点。本文扼要叙述潮滩湿地底栖微型藻类的生长繁衍与潮滩沉积过程相互作用的研究意义、研究现状，通过分析国内相关领域已有的研究工作，尤其是对长江口滩涂湿地栖息环境、生物生态过程及相关研究领域的分析，提出开展长江口滩涂湿地底栖藻类与沉积物相互作用研究的重要性，进而指出本文的研究内容。 本文主要通过野外现场取样观测、室内实验分析，结合研究区域的各种环境因子对潮滩湿地底栖藻类与沉积物相互作用进行了初步探讨。在崇明东滩靠近海三棱藨草带的光滩（藻类盐渍带）内选择一区域，在研究区域内沿高程方向选取3个断面，每个断面3个样点，分别在2005年4、5、10、12月进行了现场采样。在实验室内通过对沉积物中叶绿素a提取过程的探讨，对沉积物样品中叶绿素a浓度及沉积物粒径组成逐一进行了实验分析测试。结合研究区域的栖息环境，对沉积物中叶绿素a浓度随深度的变化、过渡带沉积物样品中叶绿素a浓度及细颗粒物质含量的分布，以及研究区域表层沉积物中叶绿素a浓度与细颗粒物质含量在不同月份的变化及其之间的相互关系进行了研究分析。 研究结果表明： [1]因受光的限制，潮滩沉积物中的叶绿素a浓度主要分布在表层约1cm内，随沉积物深度的增加，叶绿素a浓度明显下降，表明底栖藻类主要生长在表层沉积物中。在过渡带，同高程的海三棱藨草和光滩内，表层沉积物中叶绿素a浓度前者远小于后者，主要是也是因光照的影响；而表层沉积物的粒径组成，同高程的海三棱藨草和光滩内没有显著性差异。 [2]对4、5、10、12月份沉积物样品分析可知，潮滩表层沉积物中叶绿素a的浓度在4、5月份较高，分别为（5.997±0.803）μg·g^-1和（2.289±0.326）μg·g^-1，12月份最低为（0.571±0.049）μg·g^-1，表明潮滩表层沉更多还原

【Abstract】 The study of interactions between physical and biological processes in intertidal sediments has got more and more regarded. Especially interactions between benthic microalgal growth and sediment processes on an intertidal flat have been the focus of studies. This paper resumptively depicts dynamic process of interaction between benthic microalgal growth and sediment processes on an intertidal flat, and then brings forward the way of study about this area for Yangtze estuary.The chlorophyll a concentration and grain size in the sediment of intertidal flat, as well as their relations were studied based on experiment data observed in the mudflat of Chongming Dongtan in Yangtze Estuary, where samples from three transects were taken during April, May, October and December in 2005.Some results have got through the study.[1] There were remarkable seasonal variations of chlorophyll a concentrations and grain size at the surface of the mudflat, i.e., the chlorophyll a concentrations were higher in April [（5.997±0.803） μg ·g^-1] than in December [（0.571±0.091） μg ? g^-1], and the grain size had the similar trend of seasonal variations.[2] The correlation between chlorophyll a concentrations and fine-grained sediment content was significant at the 0.05 level （r=0.693, p=0.012）.[3] Moreover, due to the light limitation, the chlorophyll a concentrations at the surface of the sediments were high, and rapidly decreased with the depth, and also were higher on the sediments surface in bare tidal flat than in Scripus mariqueter Zone of the transition area.更多还原