满江红在不同培养条件下的生产性能及其与营养成分变化的关系

用人工配制的霍格兰改良培养液以及天然的地下水和池塘水对满江红进行了生产性能的测定并对水体中若干营养成分指标进行了监测。满江红在3种溶液培养条件下繁殖能力随时间的变化均呈增长、平衡、消落趋势,与二次曲线显著拟合。人工培养液中满江红的繁殖系数、固氮酶和过氧化物酶(POD)活性显著高于其它2种水体培养,而超氧化物岐化酶(SOD)的活性差异却不显著。相关分析发现,3种酶活性均同满江红的生产性能呈显著相关:固氮酶和POD酶活性呈正相关,SOD酶呈负相关。随着满江红的繁殖,溶液中若干营养成分含量也发生变化。除pH值外,其余所测定的指标在3种环境中的变化趋势基本一致,即电导率以及硝态氮、磷酸盐含量呈下降趋势,铵态氮维持在一定的低水平内;而水中的化学需氧量(COD)呈上升趋势。满江红繁殖力与溶液环境中成分变化的相关分析看出,环境中的离子态氮含量、化学需氧量的变化对满江红生产性能影响较小,而满江红的生产性能受溶液中的酸碱度、电导率及磷含量的制约。

Study on azolla productivity and its relation to the change of several nutrients in different liquid media

The productivity was measured when Azolla grew in different soluble media including artificially mixed Hoagland Azolla medium, naturally originated well water and pond water in which some nutrients were monitored. The capacity of Azolla growth in three liquid media varied with the time and the trend simulated significantly a quadratic curve showing bloom and decline. In artificial medium, Azolla had a significantly higher productivity, nitrogenase and peroxidase(POD) activity than in two natural water media but the superoxide dismutase(SOD) activities had little difference. The correlation analysis revealed that three tested enzymes had a significant correlation with Azolla productivity while nitrogenase and POD indicated the positive correlation and SOD indicated the negative correlation. With the growth of Azolla in liquid medium, almost all tested parameters for water nutrient except pH demonstrated the same dynamic trend in three liquid systems as the conductivity, the contents of nitrate and phosphate decreased, the ammonia kept in low content and the chemical oxygen demand(COD) increased. A correlation between Azolla productivity and liquid parameter showed a low influence of the fluctuation in nitrogen ion, COD on Azolla productivity that was significantly affected by pH, conductivity and phosphorus content.