研究报告
郭茹,杨京平,梁新强,朱春燕,徐辰,黄小洋,张雄飞,赵剑波.太湖苕溪流域氮磷的生物学阈值评估[J].环境科学学报,2013,33(10):2756-2765
太湖苕溪流域氮磷的生物学阈值评估
- Biological threshold of nitrogen and phosphorus in Tiaoxi River, Taihu Lake Basin
- 基金项目：国家水体污染控制与治理科技重大专项(No.2012ZX07506-006-03);杭州市社会发展研究专项(No.20110533B14)
- 作者
- 单位
- 郭茹
- 1. 浙江大学环境与资源学院, 杭州 310058;
2. 浙江省水体污染控制与环境安全技术重点实验室, 杭州 310058
- 杨京平
- 浙江大学环境与资源学院, 杭州 310058
- 梁新强
- 1. 浙江大学环境与资源学院, 杭州 310058;
2. 浙江省水体污染控制与环境安全技术重点实验室, 杭州 310058
- 朱春燕
- 1. 浙江大学环境与资源学院, 杭州 310058;
2. 浙江省水体污染控制与环境安全技术重点实验室, 杭州 310058
- 徐辰
- 浙江大学环境与资源学院, 杭州 310058
- 黄小洋
- 浙江大学环境与资源学院, 杭州 310058
- 张雄飞
- 浙江大学环境与资源学院, 杭州 310058
- 赵剑波
- 浙江大学环境与资源学院, 杭州 310058
- 摘要：水体富营养化与氮、磷含量过高密切相关,本研究从悬浮、底栖叶绿素a限值及其与氮、磷的响应关系入手,选择干、支流清晰的太湖苕溪流域作为研究区域,建立河道氮磷阈值评估方法. 90个点位的监测数据表明,苕溪流域总氮污染超标比例高;悬浮叶绿素a与总氮、总磷存在显著相关性,而底栖叶绿素a只与总氮存在显著相关性,与总磷的相关性不显著;根据回归分析、El-Shaarawi经验方程,以及对应的目前公认的悬浮叶绿素a和底栖叶绿素a的限制值(悬浮叶绿素a≤ 5 μg·L-1,底栖叶绿素≤100 mg·m-2),苕溪流域干流和支流的总氮阈值相差较大,支流(1.3 mg·L-1)大于干流(0.9 mg·L-1),总磷阈值相差不大,约为0.05 mg·L-1.干、支流有区分的氮磷阈值的限定有利于改善苕溪河流整体水质,对其他类似苕溪、支流较多的河流面源污染控制同样具有借鉴意义.
- Abstract：Eutrophication in waters was closely related to nitrogen (N) and phosphorus (P) loads. The main objective of this research was to investigate the relationship among suspended (or benthic) chlorophyll-a and N (or P) in Tiaoxi River. 90 water samples were collected from both main channel and tributaries in the river. Results showed that the river seriously suffered from total N pollution. Suspended chlorophyll-a had a good correlation with both N and P, while benthic chlorophyll-a was only correlated with N. According to the criterion of suspended chlorophyll-a (≤5 μg·L-1) and benthic chlorophyll-a (≤100 mg·m-2), total N threshold was set as 1.3 mg·L-1 for the tributaries which was significantly greater than the main channel (0.9 mg·L-1), while it was close (0.05 mg·L-1) for P. N and P threshold of the main channel and tributaries will help to improve the overall water quality of Tiaoxi River, and be indicative for non-point source pollution control in other similar rivers.
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