Characteristics of the Primary Productivity in Sishili Bay, Yantai

LIU Yihao; QIN Huawei; WANG Guoqiang; FANG Yan; LI Fan; WANG Yuexia; JIN Yang

Abstract：In order to clarify the status of primary productivity in Sishili Bay along Yantai coast,the productivity from May 2008 to December 2009 was determined with dark-white bottle method.The features of productivity variation and the status of the life activity were also analyzed.The results indicated that the mean of gross primary productivity,net primary productivity,and respiratory oxygen consumption was 3486.88 2424.67 mgO2 · m-2 · d-1,1635.02 ± 1304.71mgO2 · m-2 · d-1,and 1832.50 ± 1510.90 mgO2 · m-2 · d-1 separately all over the two years.The monthly change curve of them was in single or double apex type.Furthermore,the minimum of gross primary productivity,net primary productivity,and respiratory oxygen consumption appeared in winter (p＜0.05).The gross primary productivity and net primary productivity in 2008 were significantly higher than thoseat in 2009.Their vertical variations were obvious and reduced as the depth increased.The values in 0.5m layer were significantly higher than those at in the layers below 2.0m all over the two years and especially in summer and autumn.The primary productivity had a close relationship with phytoplankton quantity.The primary productivity was high in the areas where the amount of phytoplankton with high chlorophyll was large.And the negative value only appeared under special circumstances.The P/R value varied between 0.84 and ～6.16 and its mean was 1.92.Although the value of respiratory oxygen consumption was large in spring,summer,and autumn with strong marine biological activity,the remaining of net primary productivity was still high.The above results illustrated that energy conversion was fast and life vitality was strong in Sishili Bay.