千岛湖流域入库河流与水库水质时空差异研究  

Spatial and Temporal Differences in Water Quality between Reservoir and Inflow Rivers of Lake Qiandaohu

作　　者：程新良 方文华 陈世燕 钱鑫浩 胡亮 Cheng Xinliang;Fang Wenhua;Chen Shiyan;Qian Xinhao;Hu Liang(Hangzhou Chunan Ecological and Environmental Monitoring Station,Chun'an 311700,China)

机构地区：[1]杭州市淳安生态环境监测站,浙江淳安311700

出　　处：《环境科学与管理》2024年第12期117-121,185,共6页Environmental Science and Management

摘　　要：基于2022年千岛湖13条主要入库河流及对应水库的水质自动监测数据,探讨千岛湖流域营养盐输入对库体水质影响及其时空变化。发现:千岛湖流域河流总氮、总磷等指标均高于水库,高锰酸盐指数则相反,流域输入总磷浓度变化与水库响应呈显著正相关,表明外源输入对水库总磷浓度产生巨大影响。河流和水库的营养盐浓度均呈现明显的季节性变化,不同指标峰值产生的月份不同,河流总磷总氮最高值分别出现在6月(0.027 mg/L)和2月(1.86 mg/L),水库总磷总氮最高值则分别出现在6月(0.014 mg/L)和4月(0.88 mg/L)。千岛湖营养盐浓度存在明显的空间变化,西北入境库区到东南出境库区,主要营养盐浓度逐渐降低,其中东北库区总氮超过西北库区。Using the automatic monitoring data from 13 major inflow rivers,the spatial and temporal variation of external nutrient loading from rivers and their impact on reservoir water quality were analyzed in Lake Qiandaohu in China.The results showed that average values of TN,TP in rivers were all higher than the corresponding areas in the reservoir.And the values of CODmn in rivers were all lower than the corresponding areas in the reservoir.Significant positive correlations were found between TP concentrations in the inflow rivers and the corresponding areas in the reservoir,indicating the pronounced impact of external loading on reservoir water.Remarkable temporal variations of nutrient concentration were found both in the rivers and in the reservoir.The highest TP concentrations in inflow rivers were 0.027 mg·L^(-1)(June),while the highest TP and TN concentrations in the reservoir were 0.014 mg·L^(-1)(June)and 0.88 mg·L^(-1)(April).The nutrient concentration of Lake Qiandaohu showed obvious spatial change.The nutrient concentration decreased gradually from northwest to southeast reservoir area,and the TN in northeast reservoir area was higher than that in northwest reservoir area,indicating that the watershed non-point source control in Chun'an County still needs to be strengthened.

关 键 词：千岛湖 自动监测 营养盐 时空差异 面源治理 

分 类 号：X523[环境科学与工程—环境工程]