池塘浮游植物的初级生产力及其与若干生态因子间的关系

本文应用黑白瓶法测定了浮游植物的初级生产力,分析了初级生产力与主要生态因子间的关系。晴天,水柱的最高生产层常出现在水下0.5倍透明度左右的水层,此处光强约为20000Lx,补偿深度常随天气变化。#br#浮游植物的生产量与生物量和镁之间常表现出正相关。生长季节内单位水面下浮游植物的P/B系数为177.7,日平均1.4。浮游植物对总辐射能的利用率为0.31%。氮是三江平原池塘浮游植物初级生产力的主要限制因子。

PRIMARY PRODUCTION OF PHYTOPLANKTON IN THE POND AND ITS CORRELATION WITH ECOLOGICAL FACTORS

The estimations of primary production of phytoplankton in the pondin Sanjiang Plain were carried out in 1987 with white-black bottle method.The correlation between primary production and the major ecologicalfactors are also discussed. On sunny days, the water layer with the maximum production is atthe depth of 50% transparency, where the light intensity is about 200001x. The compensation depth changes with the climate. The correlation between primary production and biomass, Mg²⁺ is positive linear dependence. The P/B coefficient of phytoplankton under aunit of water surface is 177.7 during growth seasons. The rate of utiliza-tion of total radiation by phytoplankton is 0.31%. Nitrogen ip the wateris the Limiting factor for primary production of the pond.