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研究了在中华绒螯蟹室外育苗土池中,不同N、P比施肥对土池多混盐水体的水化学和浮游植物群落演替、叶绿素a含量和初级生产力的影响,以及浮游动物对浮游植物的下行效应。结果表明,氮是多混盐水体浮游植物生长的主要限制因子。施肥后土池多混盐水体中共检出浮游生物44种,其中浮游植物平均生物量达188.76 mg/L,优势种为湛江等鞭金藻Isochrysis zhanjiangensis;叶绿素a含量为116.96μg/L,施肥后2~3 d叶绿素a含量达到高值,之后开始下降,6~7 d后恢复到原来水平;初级生产力为2.39~12.04 gO2/(m2.d),均值为5.11 g O2/(m2.d),呈低-高-低的变化趋势。
The effects of different N and P fertilization on the hydrochemical and phytoplankton community succession, chlorophyll a content and primary productivity of Eriocheir sinensis were studied, and the effects of zooplankton on phytoplankton Downside effect. The results show that nitrogen is the main limiting factor for phytoplankton growth in polyhaline water bodies. After fertilization, 44 species of plankton were detected in the soil mixed with multi-salt water, in which the average biomass of phytoplankton reached 188.76 mg / L, the dominant species was Isochrysis zhanjiangensis, the content of chlorophyll a was 116.96 μg / L, ~ 3 d chlorophyll a content reached a high value, then began to decline, 6 ~ 7 d after the return to its original level; primary productivity of 2.39 ~ 12.04 gO2 / (m2.d), an average of 5.11 g O2 / (m2.d) Low-high-low trend.