This paper divides the lake eutrophication models into the single factor load model,the phytoplankton and nutrient salts related model and the ecological dynamics model,introduces basic characteristics of the three kinds of models,and probes into the developing trends of lake eutrophication model.
The result indicates that phytoplankton can produce protein-like and humic-like fluorescent matter. The protein-like fluorescence is composed of tyrosine-like fluorescence and tryptophan-like fluorescence. The main position of protein-like fluorescent peak is Ex_(max)/Em_(max)=270 nm/290～310 nm.
The results showed as follow: In the experiments,48 kinds of plankton species(genus) were found,in which 28 kinds were phytoplankton species(genus) and 17 kinds were zooplankton species(genus). The average biomass of phytoplankton was 2.944 mg/L.
Gauss distribution function was utilized to describe the distribution of the mean percentage of the equivalent spherical diameter (BSD) of marine phytoplankton.
As an important parameter to be considered in biochemical processes of marine phytoplankton, cell size plays a decisive role in the physiological processes of phytoplankton.
In contrast, total biomass decreased drastically at station ra5 at the end of the experiments, which might be due to the different phytoplankton composition at the three stations: station zzf1 and zc18a were dominated by non-toxic Scrippsiella trochoidea and Gyrodinium spirale, however station ra5 was dominated by toxic Alexandrium sp..
The main results included:1. 60 species (genera) of phytoplankton were found, and Bacillariophyta dominated the phytoplankton composition, amounting to 53.33% of the total species.
Iron, which could help phytoplankton grow rapidly, is a micronutrient essential to the synthesis of enzymes required for photosynthesis in the oceanic environment.
A method involving gradient elution and operating at 15°C is proposed for the separation of several polar and non-polar mono- and divinyl chlorophylls from etiolated tissues of higher plants and from marine phytoplankton.
The structural complexity of the phytoplankton community was evaluated using the index of cenotic significance (ICS) and derivative calculation coefficients.
The species and size structure of the phytoplankton community was found to have changed significantly and the community biomass, to have increased in the course of long-term succession.
This paper presents the results of investigation on the plankton of Qinghe reservoir during the six years: 1970, 1973—74 and 1977—79, The reservoir is located in Liaoning Province, Northeastern China, with an submerged area of 46 km and a mean depth of about 10 m (maximum depth 30—33 m).The standing crop of phytoplankton in Qinghe reservoir during the surveying period varied from 1.05 to 24.41 mg/l, among which Bacilladophyta was the most predominant group, being 58.6% of the total biomass. Next came Pyroph...
Summarizing the data of some nutrients monitored in recent years in the West Lake of Hangzhou, the authors discuss the temporal and spatial distribution of nitric and phosphoric nutrients and general nutrients such as calcium, magnesium and potassium ions and dissolved silica. Phosphorus equilibrium in the West Lake is discussed as well.
Some constituents of the algal blooms and the amount of chlorohpyll α in the sediments of Lake Donghu, Wuhan are investigated. On the basis of the components of the blooms, the contents of C, N, and P in the living algae sunk to the sediments are calculated. A regression is constructed to describe the relationship of carbon-chl α.The average percentage of C, N, and P of the blooms in Lake Donghu, Wuhan is 39.30, 7.98, and 0.94, respectively. The ratios of different components are listed. The dry wt./wet wt....
浮游植物
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