摘要
为探究邛海水体氮、磷污染特征,以邛海为研究对象,于2020年在邛海选取11个采样断面,对邛海水体中总氮、氨氮、总磷浓度的时空分布特征分别进行研究,探讨了氮、磷浓度与叶绿素a浓度的关系,并初步评价邛海水体富营养化状况,以期为加强邛海流域富营养化防治及保障饮用水安全提供科学依据。研究结果表明:邛海水体总氮浓度范围为0.315~0.500 mg·L^(-1),平均值为0.399 mg·L^(-1);氨氮浓度范围为0.063~0.171 mg·L^(-1),平均值为0.098 mg·L^(-1),两项指标均满足地表水Ⅱ类标准。总磷浓度范围为0.019~0.035 mg·L^(-1),平均值为0.023 mg·L^(-1),其平均值满足地表水湖库Ⅱ类标准。氮、磷浓度存在时空差异,总氮、氨氮和总磷浓度随时间变化明显,其浓度均表现为枯水期高于丰水期。空间上,总氮、氨氮和总磷空间分布规律相似,其高浓度主要集中在邛海西北部1号(海河口)和10号(高枧湾)断面附近,总体呈现东部低、西北部高的趋势。邛海水体氮磷比值平均值大小表现为枯水期高于丰水期,枯水期主要表现为磷限制状态,丰水期主要表现为氮、磷限制状态。邛海水体氮、磷浓度与叶绿素a浓度均呈显著的正相关关系,表明氮、磷浓度的增加会促进浮游藻类的生长。邛海水体富营养化评价结果显示,邛海全湖平均营养状态指数为38.011,整体均处于中营养状态,西北部水域营养状态指数较高,东部水域营养状态指数较低。
The aim of this article was to explore the characteristics of nitrogen and phosphorus pollution in the Qionghai Lake.We analyzed the temporal and spatial distribution characteristics of TN,NH^(+)4-N and TP concentrations of water samples from 11 lake sampling sites in 2020.The relationships between nitrogen/phosphorus and chlorophyll-a concentrations were discussed,and the eutrophication status of the Qionghai Lake was evaluated in order to strengthen the prevention and control of lake eutrophication and ensure the safety of the lake water source.The results showed that TN concentrations ranged from 0.315-0.500 mg·L^(-1),with a mean value of 0.399 mg·L^(-1),and NH^(+)4-N concentrations ranged from 0.063-0.171 mg·L^(-1),with a mean value of 0.098 mg·L^(-1),both meeting the standard for gradeⅡsurface water of lake and reservoir;while TP concentrations also met the standard,with a range of 0.019-0.035 mg·L^(-1) and a mean value of 0.023 mg·L^(-1).Both nitrogen and phosphorus concentrations in the Qionghai Lake show temporal and spatial differences:TN,NH^(+)4-N and TP concentrations varied significantly with time and were higher in dry season than in wet season;they have similar spatial distribution patterns,with high concentration areas mainly observed at station 1(Haihekou)and 10(Gaojian Bay)in the northwestern part of the lake,and were all higher in the northwest than in the east of the lake.The average TN/TP ratio was higher in the dry season,characterized by phosphorous limitation,than in the wet season,characterized by nitrogen and phosphorus limitation.TN,TP and NH^(+)4-N concentrations positively correlated with Chla concentration,indicating nitrogen and phosphorous could promote the algae growth.Evaluation of eutrophication in the Qionghai Lake showed that the average trophic status index(TSI)value for the lake was 38.011;and the study area was in a mesotrophic state as a whole,with a higher TSI value for the northwest and a lower TSI value for the east.
作者
时瑶
张雷
秦延文
马迎群
杨晨晨
刘志超
竹怀林
SHI Yao;ZHANG Lei;QIN Yanwen;MA Yingqun;YANG Chenchen;LIU Zhichao;ZHU Huailin(State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Institute of Water Ecology and Environment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Environmental Technology Engineering Co.,Ltd,China Academy of Environmental Sciences,Beijing 100012,China)
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2023年第2期495-505,共11页
Earth Science Frontiers
基金
国家水体污染控制与治理科技重大专项(2017ZX07206-001-03)。
关键词
邛海
氮
磷
时空分布
叶绿素A
富营养化
Qionghai Lake
nitrogen
phosphorus
temporal and spatial distribution
chlorophyll-a
eutrophication
