广西北海竹林三种海草种群生物量和生产力研究

Studies on biomass and productivity of three seagrass populations at Zhulin, Beihai, Guangxi, China

采用收获法和改进的Zieman标记法，测定了2007年11月广西北海竹林海草床二药藻（Halodule uninervis）、矮大叶藻（Zostera japonica）和喜盐草（Halophila avalis）三个种群的生物量和叶片生产力。结果表明：（1）总生物量是二药藻（198．99±22．19gDWm^-2）〉矮大叶藻（184．89±21．24gDWm^-2）〉喜盐草（110．71±12．23gDWm^-2）；（2）二药藻、矮大叶藻、喜盐草地下部分生物量占各自总生物量的比例分别为69．68％，47．59％，56．33％；（3）幼叶、成熟叶、衰老叶的生物量分别是矮大叶藻9．99±0．33gDWm^-2，26．24±2．34gDWm^-2，38．02±1．94gDWm^-2；喜盐草7.31±1．50gDWm^-2，21．19±6．25gDWm^-2，19．85±3．05gDWm^-2；（4）矮大叶藻的叶片生产力（2．05±0．15gDWm^-2·d^-1）大于二药藻（O．34±0．37gDWm^-2·d^-1）。提出了根据幼叶和衰老叶生物量比值预测种群消长的建议。

Using harvesting method and modified Zieman＇s method, the biomass and leaf productivity were studied for Halodule uninervis, Zostera japonica and Halophila ovalis seagrass populations during November 2007 at Zhulin seagrass bed, Beihai, Guangxi, China. The results showed that： （1） the highest total biomass was found in H, uninervis （198.99±22.19 g DW m^2）, the second was in Z. japonica （184.89±21.24 g DW m^2） and the third was in H. ovalis （110.71±12.23 g DW m^2）; （2） the rates of underground biomass to the total were 69.68%,47.59%,56.33% for H. uninervis, Z. japonica and H. ovalis respectively;（3） the biomasses of young leaf, mature leaf and old leaf were 9.99i-0.33 g DW m^-2, 26.24±2.34 g DW m^2, 38.02±1.94 g DW m^2 respectively for Z. japonica, and 7.31±1.50 g DW m^2, 21.19±6.25 g DW m^2, 19.85±3.05 g DW m^2 for H. ovalis; （4） the leaf productivity of Z. japonica （2.05±0.15 g DW m^2·d^1） was higher than that of H. uninervis （0.34±0.37 g DW m^2·d^1）. An approach in forecasting population growth trend by biomass proportion of young leaf to old leaf was suggested.