热冲击和加氯对海水中叶绿素a恢复的效应

The effects of thermal shock and chlorination on the recovery of chlorophyll a in seawater

于室内研究了海水中四季浮游植物在受不同升温幅度（△T）和加氯浓度（CD）胁迫后,其现存量叶绿素a在15d内的恢复过程.结果表明,自然水温越高,△T越大,叶绿素a含量恢复越慢.春、秋、冬季自然水温较低,热冲击对浮游植物生产力影响不大,△T=4,8,12℃时,叶绿素a仅需1-7d可恢复到对照组水平;夏季自然水温较高,热冲击对其生产力影响较大,当△T为4-8℃时,叶绿素a恢复需9-10d;当△T=12℃时,叶绿素a不可恢复.加氯较热冲击对浮游植物生产力影响更大,CD=1.0mg/L时,各季节叶绿素a尚能恢复,但当CD≥3.2mg/L时,叶绿素a不能恢复至对照组水平.

The effects of thermal shock and chlorination on marine phytoplankton collected from the Yueqing Bay, Zhejiang province were conducted at different temperature increment （AT） and chlorine dosage （CD） in four seasons in laboratory. The chlorophyll a level was monitored during 15d. The recovery period of chlorophyll a was longer with rising natural temperature and AT. Thermal shock at the AT of 4, 8 and 12℃ would not affect the phytoplankton primary productivity Under low natural temperature in spring, autumn and winter, as the chlorophyll a concentration could recover to the control level during 1-7d. However, thermal shock will affect it severely under high natural temperature in summer, as 9-10d was needed for recovering at the △T≤8℃ and the resilience was lost at the AT of 12℃. The adverse effect of chlorination on phytoplankton primary productivity was more than that of thermal shock. The chlorophyll a content could restore to the controlled level at the Co of 1.0mg/L, but it can not at the CD of 3.2mg/L in all the seasons.