生态环境学报2024，Vol.33Issue(5)：720-729,10.DOI:10.16258/j.cnki.1674-5906.2024.05.006
不同淹没水深下菹草对强辐射的响应
Response of Potamogeton crispus to Intense Radiation under Different Submergence Depths
摘要
Abstract
The decline of Potamogeton crispus in late spring and early summer is the focus of ecological water-restoration research.Intense radiation is a major factor contributing to the mortality of Potamogeton crispus.To investigate the resistance of P.crispus to intense radiation at different water depths,transparent fishing nets were used to push P.crispus plants to their corresponding underwater positions(10,20,and 30 cm)by simulating intense radiation.Plant morphology,leaf area,fresh weight,chlorophyll mass fraction,and chlorophyll fluorescence were measured and the results were compared with those of the control group(without compression).The results showed that when the P.crispus plants were suppressed to a depth of 20 cm,the plant height,leaf area,weight per plant,and chlorophyll mass fraction were higher than those of the other treatments,whereas the various indicators of the control group were the lowest.The activity of the PSⅡ center was the strongest in all treatment groups,and the harmful effects of UV-B radiation were minimal.The PSⅡ reaction center of the plants in the control and 10-cm treatment groups was destroyed or reversibly inactivated,and the light energy conversion efficiency,light energy transfer rate,and electron transfer rate decreased.The PSⅡ reaction center of the plants was not damaged by 30 cm underwater,but photosynthetically active radiation could not meet the growth requirements of plants in deep water.Radiation had a significant effect on all monitoring indicators,with most indicators being simultaneously affected by water depth.The plant height,internode length,chlorophyll mass fraction,Fv/Fm,ϕPSⅡ,and qP were also affected by their interactions.Therefore,20 cm underwater could meet the growth requirements of P.crispus in this experiment because the attenuating effect of water reduced the UV-B radiation.The shielding effect of water is an effective method for minimizing damage.However,in natural waters,the depth of suppression is determined by the biologically effective optical depth of the UV-B radiation.关键词
紫外辐射/菹草/形态/叶绿素质量分数/叶绿素荧光参数/生物有效光学深度Key words
ultraviolet radiation/photosynthesis/morphology/chlorophyll mass fraction/chlorophyll fluorescence parameters/biologically effective optical depth分类
生物科学引用本文复制引用
王锦旗,宋玉芝..不同淹没水深下菹草对强辐射的响应[J].生态环境学报,2024,33(5):720-729,10.基金项目
国家自然科学基金项目(42077303) （42077303）
江苏省基础研究计划(自然科学基金)(BK20220021) （自然科学基金）
