This paper deals with the accumulation and biological cycle of potassium and sodium elements of artificial 20-year-old Kandelia ccndel community in Jiulong river estuary of Fujian province, China.The main results of the measurements are as follows-1. The amounts of potassium and sodium elements in standing crop of this community were respectively 531.97 kg/ha and 2,100.36 kg/ha, in which the amounts of two elements in aerial part of biomass were(kg/ha) 296.49 for K and 742.91 for Na, and that of below groun...