In this paper, data of phytoplankton biomass and ecological factors analysed by linear regression found that, phytoplankton biomass with Ca~(2+) Mg~(2+), NO_3~+—N, NH_4~+-—N, total N, total P, COD and turbidity shows in linear dependence.
The reason that all phytoplankton biomass, Chlorophyta biomass and Cyanophyta biomass with NO_3~-—N, NH_4~+—N show linear dependence is that, The contents of NO_3~-—N and NH_4~+—N in water are so little that they become the limited factors on the growth and reproduction of phytoplanktons in the pond.
The results indicated that zoo-plarkton biomass, phytoplankton biomass, chlorophyll-a concentration and gross primary production were reduced by 58.7%, 63.6%, 52.5%, and 65.0% respectively, water transparency and Shannon-Weiner's diversity index of phytoplankton community were increased by 18.2% and 32.5%, when silver carp were stocked in the enclosures.
Bacterial density was positively correlated to water temperature, COD(chemical Oxgen Demand) and Zooplankton biomass, but it did not directly correlated with Phytoplankton biomass.
During 5.7.9 month in 1993. 5.7.9 mbnth in 1997. 9The average biomass of phytoplankton was 10.472mg/L, the biomass of Cyanophyta was 54. 9%in biomass of phytoplankton.
There are 7 families which have 57 genera with 84 species of phytoplankton in the fishponds of the Hai Kou area. The biomass of phytoplankton determined by the method of calculating cell volume generally varies between 20～100mg/L,in which the Chlorophyta is perdominate,Cyanophyta,Bacil- lariophyta and Euglenophyta rank second and Chrysophyta the least.
(1) In April, the biomass of phytoplankton has a positive correlation with the production of the fish (p<0.10), and the spatial distribution of plankton has no correlation with the environmental factors, while in the reservoir with the lowest fish production (FP) the biomass of zooplankton is significantly positively-correlative with the biomass of phytoplankton (p<0.01).
In common carp, silver carp and big-headed fingerlings ponds, when water temperature was 15~17癈, supersaturated Do were decreased by 56.84%, NRj桸 by 51.28%, plant plankton biomass were lessened by 27.64% from 890.92mg/L to 644.66mg/L in three days.
Compared with control groups, Do was increased by 26.17%, 49.54% and 34.86%, NRp-N was decreased by 32.73%, 60.00% and 52.00%, plant plankton biomass by 4.04%, 23.32% and 10.89% in ^.
Biomass of the phytoplankton and the zooplankton in the brackish pond where the southern American white prawn was reared was 7.0233~66.9334 mg/l and 3.127~26.3861 mg/l, the average biomass was 36.0076mg/l and 10.2240 mg/l respectively.
According to the survey of physical and chemical factors, the species composition, distribution and biomass of the phytoplankton in Baosheng Lake from January, 2005 to December, 2005, the essay give the negative comment on the eutrophicate levels, and initially established prediction models concerned with the change of phytoplankton biomass and TN、 TP、 conductivity in Baosheng Lake.
Based on the samples taken from more than 30 representative large-and middle -sized reservoirs in Shandong province in 1989 and 1990, the species composition,the percentage and average biomass of each phylum, species frequency class and major species of the phytoplankton are investigated. The species diversity and evenness indices, the biomass of nannophytoplankton and netphytoplankton and dominant groups or species of each representative reservoir, and their relation to the total biomass of the phytoplankton of each reservoir are presented.
SD presents high negative association with TP, TN and COD__(Cr). The results from principal component analysis show that TP,TN,COD__(Cr),SD,Chl-a and the biomass of the phytoplankton are main factors.
Phosphorus is the most influential factor of eutrophication in Chaohu Lake, and TP, TN, COD__(Cr) and the biomass of the phytoplankton can contribute to the transparency of the water quality.
Throughout the observation period, from July to October, high values of phytoplankton biomass were recorded in the Gulf of Ob and adjacent areas of the Ob-Yenisei shoal.
Experiments in Chistye Prudy pond in the period of blue-green algae blooming show large-size zooplankton to reduce phytoplankton biomass in the pond throughout the period of phytoplankton growth.
Cladoceras Simocephalus vetulus with a biomass of 1.6 g/l in flow-through ecosystems isolated from ichthyifauna can reduce phytoplankton biomass from 2.89 to 0.12 mg/l within 1 h.
In the period when phytoplankton biomass in the water body was at maximum, the activity of cladoceras (biomass of 2.1 g/l) resulted in a decrease in this biomass in flow-through ecosystems by a factor of 13.6 (down to 0.34 mg/l).
The decrease in phytoplankton biomass in flow-through ecosystems facilitated changes in its composition in the water body (an increase in the share of green algae) and was accompanied by an increase in water transparency.
The ultraplankton (cell diameters >amp;gt;3 μm), which compromises about 70% of the biomass of phytoplankton in subtropical surface waters near Oahu, Hawaii, was isolated for growth rate studies.
In this study the rates, species composition and biomass of phytoplankton input to Frobisher Bay sediments were examined during ice (late November to July) and open water (late July to October) periods from 1982 to 1985.
Integrated protozoan biomass was >amp;lt;12% of the biomass of phytoplankton during the spring cruise and in the autumn the percentages at some stations were >amp;gt;20%.
The study sites differed in the species and quantitative composition of the dominant complex, but the total abundance and biomass of the phytoplankton in the heated zone and the control site did not differ significantly.
Variations in physiological state and biomass of the phytoplankton community were examined in three different types of lakes, namely Lake Barato, Lake Akan, and Lake Shikaribetu.
浮游植物生物量
phytoplankton biomass
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