These nine environmental changes were well reflected by the variations of coarseness and fineness of grain - size of fluvial sedimentary profiles near dongweiqiao site of tang dynasty . 3 这不仅在剖面各层的粒度累计含量可以清楚地反映出来,且各个粒度参数一md 、 mz 、 o 、 sk和kg也同样具有显著响应。