摘要
以太湖胥口湾湖滨带芦苇、香蒲和菖蒲等典型挺水植物为研究对象,通过分析这3种挺水植物不同生长阶段器官中营养元素含量,结合其单位面积生物量以及分布面积,估算水生植物收割的氮(TN)、磷(TP)去除效应。结果表明:湖滨湿地沉积物中TN含量在生长期和衰老期分别为1373.0~2919.8和2240.6~3923.4 mg·kg-1,TP含量分别为437.1~687.3和556.0~790.7 mg·kg-1;3种植物在生长期和衰老期不同器官的TN、TP含量差异显著(P<0.05),且均表现为叶>根>茎;由生长期到衰老期,3种挺水植物叶和茎中TN和TP含量下降,而根部则增加;3种挺水植物器官中总碳含量表现为根≈茎>叶,且受植物生长期影响较小;在3种挺水植物中,芦苇叶中TN含量最高,香蒲茎中TN含量最高,三者根中TN含量相当;香蒲叶、茎、根中TP含量最高,而芦苇叶、茎、根中总碳含量最高;衰老期间,收割3种优势挺水植物可有效去除TN 21.8 t(18.47 g·m^-2)、TP 1.6 t(1.36 g·m^-2),有效降低植物残体腐烂分解造成的二次污染。
We analyzed nutrient concentrations in different organs of Phragmites australis,Typha orientalis and Acorus calamus in various growth stages,dominant emergent plant species along littoral zone of Xukou Bay,Lake Taihu.Then,the removal of nitrogen and phosphorus was estimated based on nutrient concentration,biomass,as well as plant distribution.The results showed that total nitrogen concentrations in the sediments of littoral zone were 1373.0-2919.8 and2240.6-3923.4 mg·kg-1in the flowering and fading stages,respectively,while total phosphorus concentrations were 437.1-687.3 and 556.0-790.7 mg·kg-1,respectively.Total nitrogen and total phosphorus concentrations were significantly differed across organs of three emergent plants in both flowering and fading stages(P<0.05),with a trend of leaves>roots>stems.Total nitrogen and total phosphorus concentrations in the leaves and stems of three emergent plants in the flowering stage were higher than those in the fading stage,but an opposite trend of total nitrogen and total phosphorus concentrations in the roots.Total carbon concentrations in different organs were in the order of root≈stem>leaf,which did not significantly vary with growth stages.The highest total nitrogen concentration in leaves and stems was observed in P.australis and T.orientalis,respectively.Total nitrogen concentration in roots was similar among those three species.The highest total phosphorus and total carbon concentrations in different organs were observed in T.orientalis and P.australis,respectively.Harvesting the three dominant emergent plants in fading stage could remove 21.8 tons(18.47 g·m^-2)of total nitrogen and 1.6 tons(1.36 g·m^-2)of total phosphorus,and thus reduce the secondary pollution caused by in situ decomposition of aquatic plants.
作者
张杰
胡月敏
付东王
朱金格
邓建才
ZHANG Jie;HU Yue-min;FU Dong-wang;ZHU Jin-ge;DENG Jian-cai(State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;Nanjing Water Planning and Designing Institute,Co.Ltd,Nanjing 210022,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2020年第7期2159-2166,共8页
Chinese Journal of Ecology
基金
国家水体污染控制与治理科技重大专项(2017ZX07205-02)
国家自然科学基金项目(41271213)资助。
关键词
胥口湾
湖滨带
挺水植物
营养盐
分配特征
生态效应
Xukou Bay
littoral zone
emergent plant
nutrient
allocation characteristics
ecological significance
