| 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.
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