The total biomass of S.alterni flora growing in the mouth of the old yellow river course in Binhai county, Jiangsu province, was 3154.8g(dw)/m2-a in 1989.The annual changes in Fe and Mn.were similar to the biornass change of S.alterniflora,and parhaps the lack of Fe and Mn in July and August was the limitation of Spartina growing.The highest value of Zn in September was probably correlated with the plant reproduction.It is well worth to enquire whether the highest value of Cu in July is correlative or not w...