Abstract
To cope with luxuriant plant growth in the streams of southern Ontario, an approach to determine the desirable and nuisance plant levels was proposed.
With a more intensive analysis of the assimilation efficiency of plant communities, which includes the fractionation of community respiration as well as compensation for the plant self-shading effect, the plant biomass of all species component expressed as chlorophyll a can be estimated from the modified growth equation, where B is the biomass, Pmax is the photosynthetic growth rate at light saturation, A is the assimilation number and S is the plant shading coefficient. Once comparable biomass values are available, a desirable plant level relative to specified environmental standards can be determined.
For instance, to meet the minimum dissolved oxygen criteria of 5 ppm, the desirable and the nuisance crop levels in the North Thames River, Ontario, were found to be 0.15 and 0.75 g chla/m2 respectively.
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Wong, S.L., Clark, B. The determination of desirable and nuisance plant levels in streams. Hydrobiologia 63, 223–230 (1979). https://doi.org/10.1007/BF00023626
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DOI: https://doi.org/10.1007/BF00023626