水生生物学报2024，Vol.48Issue(2)：232-241,10.DOI:10.7541/2023.2023.0130
不同功能型沉水植物对溶解氧影响及环境效应
DIFFERENT FUNCTIONAL TYPES OF SUBMERGED MACROPHYTES ON DISSOLVED OXYGEN AND ITS ENVIRONMENTAL EFFECTS
摘要
Abstract
The concentration of dissolved oxygen(DO)in lakes decreases due to eutrophication and climate warming.However,submerged macrophytes can release oxygen through photosynthesis,effectively increasing DO levels in lakes.The process can induce changes in the physicochemical properties of the water column and sediment,sub-sequently impacting the ecosystem.We conducted a mesocosm experiment to examine the differences in dissolved oxy-gen and related indexes in water column and sediment across different functional types of submerged macrophytes.Val-lisneria spinulosa was assigned to bottom-dwelling species,Hydrilla verticillata was assigned to less rooted canopy-forming species,while Myriophyllum spicatum was assigned to more rooted canopy-forming species.The results showed that significant differences in water column DO among treatment groups.The blank group had significantly lower water column DO compared to the plant treatment group,and it exhibited the least reduction in total nitrogen(TN)and total phosphorus(TP)in the water column.The specific leaf area,leaf area index,net growth biomass,total biomass,relative growth rate and water column DO of H.verticillata were the largest,which can effectively reduce the concentration of TP and TN in the water column.The plant height of M.spicatum was the highest,and its ability to ele-vate water column DO was significantly higher than that of spiny bittercress,with the greatest reduction in water column TP.V.spinulosa had the largest specific root length,total root length per individual and root shoot ratio among the 3 species.It significantly increased DO concentration in the sediment up to a depth of 6 cm.Additionally,V.spinu-losa had the highest sediment iron content and the lowest sediment total nitrogen(TN),total carbon(TC)content and total dissolved phosphorus(TDP)in interstitial water.Therefore,we suggest diverse functional submerged macrophyte types were constructed in the restoration of eutrophic lakes,such as combing bottom-dwelling and canopy-forming spe-cies,since it would be conducive to the formation of clear water state.关键词
功能型/沉水植物/溶解氧/环境效应/植冠/根系Key words
Functional types/Submerged macrophytes/Dissolved oxygen/Environmental effects/Canopy/Root system分类
生物科学引用本文复制引用
李华歆,殷春雨,杨国梁,蔡颖,黄晓龙,李宽意,关保华..不同功能型沉水植物对溶解氧影响及环境效应[J].水生生物学报,2024,48(2):232-241,10.基金项目
国家自然科学基金(32171534和32001157) （32171534和32001157）
浙江省"尖兵""领雁"研发攻关计划(2022C02038)资助[Supported by the National Natural Science Foundation of China(32171534 and 32001157) （2022C02038）
Zhejiang Province"Spearhead"and"Leading Wild Goose"Research and Development Project(2022C02038)] （2022C02038）
