Abstract: The composition,coverage,biornass and dorninant species of benthic seaweed cornmunlty within intertidal in Dalian,China were monthly investigated frorn March 1990 to March 1991.It isxhown that 1).the gen-eral tendency of seasonal quantitative variation of beaweed communities is later spring and early surnrner ＞auturn＞mid-summer＞winter. 2).there are significant quantitative difference(p＜0.001)and remark-able replacement of domlnant Species among differeiit communities in the seasons regardless of any habi-tat,which rnight imply that the seasonal variation should include both inner-and inter-alterations of communities. 3).habitats have a very significant effect(p＜0.001) on the seasonal variation of seaweed communities,i.e. the extent of seasonal variation among different habitats can be ranked as mid-inter-tidal＞low intertidal＞high intertidal＞rock-pools.and that of disturbance made by sea wave and exposure can be banked as rock pool＜low intertidal＜mid-intertidal＜high intertidal.

Key words: cadmium, Chardonnay, subcellular distribution, chemical form.