摘要
通过分析2000年-2015年的三峡库区长江、嘉陵江、乌江干流总磷浓度数据,掌握三峡库区总磷总体水平,长江干流总磷浓度为0.135±0.043 mg/l,为Ⅲ类水质;嘉陵江总磷浓度较低,为0.075±0.033 mg/l,为Ⅱ类水质;乌江干流总磷浓度较高,约为0.403±0.288 mg/l,为V类水质。长江重庆段入境朱沱断面的总磷浓度在枯、丰水期呈显著上升趋势,出境培石断面的总磷浓度在枯、平水期呈显著上升趋势。乌江干流入境万木断面和入库锣鹰断面总磷浓度变化趋势一致,都表现为先升高后降低。从2009年开始升高,在2011年或2012年达到峰值,最大浓度超过1.0 mg/l,然后开始逐年下降,到2015年浓度下降到0.2 mg/l。
The data of total P concentrations in three main streams of Three Gorges Dam （iChangjiang River, Jialing River, Wujiang River）from 2000 to 2015 were analyzed so as to understand the general levels of total P in this watershed. The total P concentration is 0. 135 ＋ 0. 043 rag/1 in Changjiang River（ iwater quality：grade Ⅲ） , 0. 075 ＋ 0. 033 mg/1 in Jialing River（ igrade Ⅱ）, and 0. 403 ＋ 0. 288 mg/1 in Wujiang River（ igrade V）. In the Chongqing segment of Changjiang River, the total P concentrations at Zhutuo entry section significantly rise in both low - water and high - water seasons, while the total P concentrations at Peishi exit section significantly increase in both low- water and normal- water seasons. In Wujiang River, at the Wanmu entry section and the Luoying exit section, the total P concentrations show the same trend of increasing first and then decreasing ： the total P concentrations started to rise since 2009, maximized to 1.0 mg/1 in 2011 or 2012, then decreased gradually, and dropped to 0. 2 mg/1 at 2015.
出处
《环境科学与管理》
CAS
2016年第9期56-59,共4页
Environmental Science and Management
关键词
三峡库区
总磷
浓度
趋势变化
Three Gorges Dam watershed
total phosphorus
concentrations
changing trend
