Читать книгу Sustainable Solutions for Environmental Pollution, Volume 2 - Группа авторов - Страница 61

Duckweed is a widespread floating plant family, whose five main genera are Lemna, Spirodela, Wolffia, Wolffiella, and Landoltia (Zhang et al., 2014b). Their growth, based on Monod’s equations, can be described in function of temperature, light, and nutrients (N and P). The mechanistic model developed by Peeters et al. (2013) takes also into account losses due to mortality, grazing, and respiration (Peeters et al., 2013). Growth is limited by crowding, meaning that when there is no more enough space (around 180 g dry weight per square meter) duckweed stops to develop (Driever et al., 2005). Although a general modeling structure can be proposed, parameters may differ according to the species, some of them being for example favored by high nutrient availability (Njambuya et al., 2011). In the case of mixed vegetation, duckweed mats induce shading for submerged plants and algae, i.e., a decrease of the solar irradiance necessary for their photosynthesis. In large surface-flow CWs wind can displace duckweed mats, changing their thickness and therefore the shading of submerged vegetation.