Abstract:Three batches of water samples were collected from Xiangxi River between March to May 2010, and the L9(34) orthogonal experiments of algae growth were conducted in laboratory. Nutrient concentrations in water, water temperature, light intensity and water flow velocity were selected as environmental factors, and the growth rate of Chla was taken as evaluation index. The effects of environmental factors on the growth of preponderant diatoms in spring were studied. The optimal conditions for algal growth under the condition of the orthogonal experiments were 3.5mg/L for total nitrogen (TN), 0.3mg/L for total phosphorus (TP), 20℃ for water temperature, 4700lx for light intensity and 0.1m/s for flow velocity. The degree of impact of environmental factors on the algal growth was light intensity, velocity, water temperature and nutrient concentration in turn. The algae growth rates in flow water with velocity being 0.05m/s or 0.1m/s was significantly higher than that in static water. The increase of TN and TP concentration could obviously promote the algae growth when TN<1.5mg/L, TP<0.1mg/L;the effects of increasing TN and TP concentrations on algae growth was little when TN and TP concentrations respectively reached 3.5mg/L and 0.3mg/L.
龙天渝, 周鹏瑞, 吴磊. 环境因子对香溪河春季藻类生长影响的模拟实验[J]. 中国环境科学, 2011, 31(2): 327-331.
LONG Tian-Yu, ZHOU Peng-Rui, WU Lei. The simulating experiment for the impacts of environmental factors on Spring algae growth in Xiangxi River. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(2): 327-331.