厦门港浮游生物对可溶性活性磷(SRP)吸收动力学的研究

Studies on Uptake kinetics of Soluble Reactive Phosphorus(SRP) by Microplankton in Xiamen Harbor

于１９９０年４个季节在厦门港进行对浮游生物（＜２００μｍ）对ＳＲＰ吸收动力学的现场实验．结果表明，ＳＲＰ吸收动力学４个季节都符合Ｍｉｃｈａｅｌｉｓ－Ｍｅｎｔｅｎ方程，最大吸收速率（Ｖｍａｘ）是夏＞春＞秋＞冬，分别是各季ＳＲＰ吸收速率的１．１０，２．３３，３．０９和３．５５倍；ＳＲＰ吸收半饱和常数（Ｋｓ）是夏＜秋＜冬＜春，分别是各季ＳＲＰ的１．２９，２．３０，２．１９和３．６９倍，与ＳＲＰ成负相关．初步阐明了自然浮游生物群落在不同季节对ＳＲＰ的吸收特性和生态适应机制；首次探讨了运用３２ＰＯ３－４同位素稀释技术研究营养盐吸收动力学的实验方法．

SRP uptake kinetics by microplankton experiments in situ were conducted seasonally from Feb. to Nov. 1990 in Xiamen Harbor. Results showed that SRP uptake kinetics in all seasons could fit MichaelisMenten equation and seasonal variations in the parameters of SRP uptake kinetics,maximum uptake rates (V_max, summer>spring>fall>winter) and half uptake saturation constants (Ks,summer<fall<winter<spring). V_max was negatively correlated with SRP. V_max was 1.10, 2.33, 3.09, 3.55 times to SRP uptake rates and Ks was 1.29, 3.69, 2.30, 2.19 times to SRP in summer,spring,fall and winter respectively. Differences of SRP uptake kinetics were reflections of ecological adaptive mechanisms of natural microplankton assemblages in different seasons. Experimental methods for nutrient uptake kinitics by using 32PO_4~3- isotope dilution techniques were firstly inquired into in the paper. 