摘要
研究了江苏沿海滩涂不同养殖模式下初级生产力特征、能量利用率及其影响因子。结果表明,滩涂养殖水体浮游植物的初级生产力存在垂直分布、日变化和季节的动态变化,这种变化与太阳辐射强度有直接的关系。滩涂养殖水体净初级生产量平均值为(7.58±2.52)gO2/(m.2d),只占毛产量的55.41%,太阳能转化为鲢、鳙鱼产量的生态效率为0.020%～0.029%,这些指标低于我国高产养殖塘,鱼塘生态系统结构有待进一步优化。浮游植物生物量、透明度、N/P值、Mg2+浓度等因素显著影响水体初级生产力的大小,多元逐步回归表明浮游植物叶绿素含量和到达水体表面的太阳辐射强度是初级生产力的最主要因子,其回归方程为:Pg=0.0785Cha+0.0577Iλ0+1.346;n=22,FCha>FIλ0>F0.1,而盐度、Na+、Cl-浓度影响不显著。
The characteristics of primary productivity, utilization of solar energy efficiency and their impact factors under the different culture models were studied in the coastal fish ponds of Jiangsu. The resuhs showed that there existed dynamic changes of the primary productivity （ such as vertical distribution, daily variation and seasonal changes） in the water of fish ponds, and thus changes were directly related to the solar radiation intensity. The average net primary productivity （P） was （7.58±2.52） gO2/（ m^2. d）, which was only about 55.41% of gross primary productivity （Pg）. The ecological efficiency of transforming solar radiation energy to carp products was from 0. 020% to 0. 029%, the ecological indexes were lower in the coast fish ponds than the high-yield ponds, indicating that the ecosystem structure needs to be further optimized. The primary productivity of the water was significantly affected by the phytoplankton chlorophyll, solar radiation intensity, phytoplankton biomass, transparency, N/P ratio, Mg^2＋ concentration, but not significantly influenced by the contents of total salts and concentrations of Na^＋ and Cl^- in the water.
出处
《生态学报》
CAS
CSCD
北大核心
2009年第2期1038-1047,共10页
Acta Ecologica Sinica
基金
江苏省海洋渔业资助项目
太湖专项资助项目(BS2007116)
江苏省重点领域资助项目
关键词
沿海滩涂
鱼塘生态系统
光合能量利用
影响因子
coastal fish ponds ecosystem
nutrients
phytoplankton biomass
primary productivity
elements of salts
solar radiation intensity
