摘要
为研究沉积物内源磷释放对浅水湖泊水体总磷的影响,以华阳河湖群为对象,根据不同季节全湖水质监测数据,分析总磷的空间和季节性分布特征;结合沉积物间隙水磷浓度数据,采用浓度梯度扩散模型估算湖泊沉积物内源磷静态释放量;基于2019年在线水质监测站连续数据,分析典型沉积物再悬浮过程内源磷释放对水体总磷贡献及估算其年累积释放量.结果表明:①华阳河湖群现场监测总磷浓度变化范围为0. 014~0. 297 mg/L,龙感湖与黄大湖总磷浓度空间变幅大于泊湖;②典型再悬浮过程中内源磷动态释放对水体总磷的贡献可达75%,华阳河湖群内源磷的年释放量在1. 129×10~4~1. 684×10~4t之间;③静态的内源磷年释放量为12. 92 t,仅占动态释放量0. 1%.研究显示:华阳河湖群总磷浓度时空差异较大,内源磷释放对总磷短期波动具有重要作用,静态释放量对全年内源磷释放量的贡献几乎可以忽略;严格控制入湖营养盐通量的同时,恢复草型湖泊生态系统以控制内源释放已成为解决华阳河湖群水环境问题的重要管理决策方向.
In order to investigate the effect of internal phosphorus release on total phosphorus concentration in shallow lakes,this article takes Huayang Lakes as the research object,the spatial and seasonal distribution characteristics of total phosphorus were analyzed according to the monitoring data of the whole lakes in different seasons. The amount of static internal phosphorus release in lake sediment was estimated by the concentration gradient diffusion model with phosphorous concentration in pore water and in sediment. The contribution of internal phosphorous release to total phosphorous and annual cumulative release during sediment resuspension process was analyzed based on the time series data on-line water quality monitoring station in 2019. The results showed:(1) The spatial temporal monitored total phosphorus concentration of the Huayang Lakes carried in a range of 0.014-0.297 mg/L,and the spatial variation of total phosphorus concentration in Longgan Lake and Huangda Lake was higher than that in Po Lake.(2) The contribution of dynamic internal release of total phosphorus could reach 75% in a typical resuspension process,and the annual internal phosphorus release in Huayang Lakes was about 1. 129×10~4-1. 684×10~4 t.(3) The static release was about 12. 92 t/a,accounting for only 0. 1% of the dynamic internal release.This study revealed that the spatial temporal total phosphorus concentration in Huayang Lakes changed remarkably,internal phosphorus release was significance for short-term sequence variation of total phosphorus,and the contribution of static internal phosphorus was limited. Strictly controlling the nutrient flux from rivers into lakes and restoring macrophytic lake ecosystem have become the important measures for solving the water environmental problems of Huayang Lakes.
作者
范中亚
王文才
蒋锦刚
马金玉
王钟
曾凡棠
FAN Zhongya;WANG Wencai;JIANG Jingang;MA Jinyu;WANG Zhong;ZENG Fantang(National Key Laboratory of Water Environmental Simulation and Pollution Control,South China Institute of Environmental Sciences,Ministry of Ecology and Environment,Guangzhou 510655,China;Institute of Technical Biology&Agriculture Engineering,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2020年第5期1170-1178,共9页
Research of Environmental Sciences
基金
长江生态环境保护修复联合研究项目(第一期)(No.2019-LHYJ-01-0212,2019-LHYJ-01-0212-17)
长江生态保护与修复安全驻点研究项目(No.2018CJA030301-014)。
关键词
华阳河湖群
内源释放
沉积物再悬浮
湖泊水质保护策略
Huayang Lakes
internal release
sediment resuspension
protection strategy of lake water quality
