Potamogeton crispus plays an important role in purifying water and maintaining a healthy aquatic ecosystem in some shallow lakes; however, mass mortality occurs to P. crispus populations in the late spring and early summer, which possibly results in secondary pollution. Therefore, the causes of P. crispus mass mortality have been a hot research topic in the field of aquatic ecological restoration. Some researchers have reported that intense light is the key factor in the decline of P. crispus. The UV鄄B band in strong light is generally recognized to damage plants and animals, and can even penetrate into the water column and cause harm to aquatic organisms. Therefore experiments were conducted to determine the effect of the UV鄄B radiation in strong light on P. crispus decline. In this study, mature plants of P. crispus were daily exposed to different doses of UV鄄B radiation (50, 100, 150, and 200 滋W / cm 2) for 6 hours (09:00-15:00). The cumulative effective doses of UV鄄B radiation were, respectively, 10.8 kJ / m 2 , 21.6 kJ / m 2 , 32.4 kJ / m 2 and 43.2 kJ / m 2. The control group was only exposed to UV鄄A radiation and photosynthetically active radiation (PAR). PAR and UV鄄A radiation were set to the same
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