摘要
沉水植物苦草(Vallisneria natans L.)作为水生态系统中的重要初级生产者,在治理富营养化水体方面发挥着至关重要的作用.然而,目前关于水下补光的研究主要集中在实验室内,采用LED灯进行实验.在面对水文条件复杂的户外自然环境和受污染水体时,相关的光补偿实验研究相对较少.本文运用一种新型的水下自然光补偿设备,通过设置不同强度的水下光补偿条件:高补光(30.5%自然光)、低补光(15.7%自然光)和对照组(2.8%自然光),研究在户外自然河道条件下苦草幼苗的生长形态、光合作用及抗氧化和毒性胁迫指标.研究发现,与对照组相比,高、低补光组株高分别增加了120%和80%,叶片数分别增加了83.3%和33.3%,叶绿素a含量分别提高了49.4%和30%.实验结果表明,光补偿对苦草幼苗的抗氧化酶活性有显著影响,幼苗对氧化毒性胁迫的抗性平均提升23.9%~48.6%,但光照强度变化对苦草幼苗的可溶性蛋白含量影响并不明显.研究结果可为受污染水体中沉水植物种群恢复提供一定理论依据.
As an important primary producer in aquatic ecosystems,the submerged plant Vallisneria natans L.plays a vital role in the remediation of eutrophic waters.However,current researches on effects of underwater supplemental lighting to Vallisneria natans L.are predominantly from laboratory settings.Only few researches on light compensation experiments were conducted in natural and polluted water bodies with complex hydrological conditions.In this study,a novel underwater natural light compensation device was employed for investigating the growth morphology,photosynthesis,and antioxidant and toxicity stress indicators of V.natans seedlings under different underwater light compensation conditions of high compensation(30.5%natural light),low compensation(15.7%natural light),and a control group(2.8%natural light)in outdoor natural river channels.Compared to the control group,the high and low compensation groups showed a 120%and 80%increase in plant height,an 83.3%and 33.3%increase in leaf number,and a 49.4%and 30%increase in chlorophyll a.The results indicated that light compensation significantly influenced the antioxidant enzyme activity of V.natans.seedlings,with an average enhancement of resistance to oxidative toxicity stress ranging from 23.9%to 48.6%.However,changes in light intensity had a less pronounced effect on the soluble protein content of the seedlings.The findings of this study provide a theoretical basis for the population recovery of submerged plants in polluted water bodies.
作者
花炜
余成
段高旗
徐磊
张坚
彭剑峰
HUA Wei;YU Cheng;DUAN Gaoqi;XU Lei;ZHANG Jian;PENG Jianfeng(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009;School of Geographical Sciences and Surveying and Mapping Engineering,Suzhou University of Science and Technology,Suzhou 215009;Research Institute for Environmental Innovation(Suzhou),Suzhou 215163;Water Quality and Water Ecology Research Center,School of Environment,Tsinghua University,Beijing 100084;Kunshan Water Affairs and Hydrological Dispatching Center,Suzhou 215300)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第3期450-458,共9页
Acta Scientiae Circumstantiae
基金
国家重点研发计划(No.2021YFC3200703)
国家自然科学基金资助项目(No.41801148)
苏州市水利水务科技项目(No.2020003)。
关键词
沉水植物
水下光补偿
生长形态
叶绿素
抗氧化毒性胁迫
submerged macrophyte
underwater illumination compensation
character of growth
chlorophyll
antioxidative toxic stress
