Читать книгу Sustainable Solutions for Environmental Pollution, Volume 2 - Группа авторов - Страница 60

In the early 1980s, Best (1981) proposed a mechanistic model to describe the seasonal growth and primary production of C. demersum. Its growth is governed by light and temperature (Best, 1981). Light availability at a certain water depth is obeying to the Beer-Lambert’s law and is also a function of the biomass present above (shading effect). The model incorporates the effect of photosynthesis and the senescence. Herb and Stefan have added the daily variation of solar irradiance (Herb and Stefan, 2003) and studied the effect of the competition between two submerged species (Herb and Stefan, 2006). A general additive model has been proposed by Yang et al. (2020): the global biomass growth was explained by four individual variables (water depth, transparency, N_tot, and P_tot) and two combined variables (water depth × transparency and water depth × P_tot). The model was tested on a biomass composed of 10 species, Potamogeton crispus and Ceratophyllum demersum being the most common species found in twelve sites of a shallow lake (Baiyangdian Lake, Hebei province, China) (Yang et al., 2020).