摘要
以宁波城区内河为研究对象,调研沉水植物在154条河中的分布情况,实测63个代表样点的水环境指标,分析秋、冬季沉水植物群落变化及生理变化.研究发现:宁波城区内仅有8条河流单一地生长有沉水植物轮叶黑藻(Hydrilla verticillata)、苦草(Vallisneria natans)和金鱼藻(Ceratophyllum demersum)中的1种;3种沉水植物分布与溶解氧、氧化还原电位和pH均呈显著正相关,与水深、氨氮(NH3-N)和总磷(TP)浓度均呈显著负相关;有沉水植物分布的河道水深较浅(约0.9 m)、水质更优(普遍优于V类);与秋季相比,冬季3种植物的群落盖度均下降,轮叶黑藻和苦草体内丙二醛、过氧化氢含量升高,暗示植物细胞受损;而3种沉水植物均具有一定耐低温胁迫能力,主要表现为体内抗氧化酶活性、可溶性蛋白和可溶性糖含量升高.结果表明,水深、NH3-N、TP、溶解氧以及低温可能会影响城区内河沉水植物的生长与分布.
In this study,the distribution of submerged plants in 154 rivers in Ningbo urban area was investigated.The environmental indexes were measured at 63 sampling sites of rivers.The physiological parameters of submerged plants in autumn and winter were also analyzed.Our results show that 3 species of submerged plants (including Hydrilla verticillata,Vallisneria natans and Ceratophyllum demersum) were observed in eight rivers of Ningbo urban area.Canonical correspondence analysis (CCA) of submerged plants and environmental factors revealed that the distribution of submerged plants was negatively correlated with water depth,ammonia nitrogen (NH3-N) and total phosphorus(TP),while positively correlated with redox potential,dissoloved oxygen(DO) and pH.Compared with rivers without submerged plants,the ones dominated with submerged plants are generally shallower and have better water quality.Compared with autumn,the coverage of the three plant communities decreased in winter,and the contents of H2O2 and MDA increased in H.verticillata and V.natans,suggesting low temperature cause damaged to these plants;while all the three submerged plants in this study showed somewhat endurance to low temperature stress because of the increase of antioxidant enzymes,soluble protein and soluble sugar in plants.These results indicate that water depth,NH3-N,TP,DO and low temperature might be the main factors limiting the submerged plant restoration in Ningbo urban rivers.
作者
王苏鹏
陈吉炜
刘意恒
吕家树
张松贺
WANG Supeng;CHEN Jiwei;LIU Yiheng;LV Jiashu;ZHANG Songhe(College of Environment,Hohai University,Nanjing 210098,P.R.China;Ningbo City Inland River Management Office,Ningbo 315040,P.R.China)
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2019年第4期1064-1074,共11页
Journal of Lake Sciences
基金
国家自然科学基金项目(51579075,51879084)
江苏省自然科学基金项目(BK20160087)联合资助
关键词
城区河流
沉水植物
生态修复
抗氧化系统
Urban river
submerged plant
ecological restoration
antioxidant system
