When average water depth is 0.3m, the average density and coverage of reeds reach apex value. While the height and diameter at breast height of reeds increase with the increasing of water depth. There has obvious change of environmental gradients in Yellow River Delta. 在平均水深为0·3m时,芦苇平均密度和平均盖度出现明显的峰,随水深变化向峰两侧递减,而芦苇平均株高和平均茎粗随水深增加呈递增趋势。