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1999年 4—5月运用荧光法和14C同位素示踪法测定了渚碧礁、永暑礁、赤瓜礁、华阳礁、南薰礁5个■湖和附近海区15个站位的叶绿素a含量和初级生产力，结果表明，■湖内的平均初级生产力和平均同化系数分别为 1．52±0．90 mg C·m－3·h－1 和 6．34±1．56 mgC·（mg Chl．a）-1·h－1 。附近海区的平均初级生产力为 0．27±0．12 mg C·m-3·h-1，最大值分布在 50m水层；平均同化系数为 2．99±0．85 mg C·（mg Chl．a）-1·h-1 ，最大值分布在50m水层，最小值分布在75m水层。珊瑚礁■湖初级生产力和同化系数都比附近海区高，可能与■湖的特殊生态环境和生物群落组成有关。
From April to May 1999, the chlorophyll a of 15 sites of Lake Zhubai, Yongshuu Reef, Red Melon reef, Huayang reef and Nanxun reef were measured by fluorescence method and 14C isotope tracing method. The results showed that the mean primary productivity and average assimilation coefficient in the lake were 1.52 ± 0.90 mg C · m-3 · h-1 and 6.34 ± 1.56 mgC · (mg Chl.a) -1 · h-1. The average primary productivity in the nearby sea area was 0.27 ± 0.12 mg C · m-3 · h-1 and the maximum was distributed in the 50-m water layer. The average assimilation coefficient was 2.99 ± 0.85 mg C · (mg Chl .a) -1 · h-1, the maximum value is distributed in 50m water layer, the minimum value is distributed in 75m water layer. Coral reefs • Lake primary productivity and assimilation coefficients are both higher than those in the nearby sea areas and may be related to the special ecological environment and biotic composition of lakes.