三峡库区香溪河回水区营养状态变化特征与驱动因子
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国家水体污染控制与治理科技重大专项(2014ZX07104-006-05)


Variation characteristics of trophic states of Xiangxi River backwater area in Three Gorges Reservoir and its driving factors
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    摘要:

    基于2015—2016年香溪河回水区域主要水质参数和营养状态的周年监测数据,分析并探讨三峡库区香溪河库湾回水区营养状态的季节性变化特征及潜在污染来源。结果表明:(1)香溪河回水区TN、TP污染十分严重,在调查时段内,各月份香溪河库湾水体的TN、TP质量浓度均远高于限制值,易发生水体富营养化;(2)香溪河回水区水体营养程度较高,所有月份均达到中营养以上水平,并在2015年8月达到富营养状态。水体营养状态从低到高季节顺序为秋季、冬季、春季、夏季。TN质量浓度是影响香溪河回水区水体富营养化程度最重要的指标;(3)香溪河回水区TN主要来自农业面源污染和城镇生活污水排入,流域上游的磷矿资源开采产生的工业废水以及库湾沿岸的点源污染是水体中CODMn与TP污染负荷的主要来源。水体中Chl-a质量浓度受TN、TP等营养盐的限制较弱,SD受浮游藻类和悬浮物的共同影响。

    Abstract:

    The seasonal variation characteristics of trophic states and potential pollution sources of Xiangxi River backwater area in the Three Gorges Reservoir were analyzed based on the annual monitoring data of major water quality parameters and trophic states in Xiangxi River backwater area during 2015-2016. The results show that: (1)TN and TP pollution in Xiangxi River backwater area are very serious. During the study period, the concentrations of TN and TP in each month were higher than the limiting value, making the water of Xiangxi River backwater area easy to eutrophication. (2)Trophic States of the Xiangxi River backwater area is quite high, reaching the level of middle eutrophication in all the months, and even being eutrophication in August, 2015. Seasonally, the order of water trophic states from low to high is autumn, winter, spring and summer. The concentration of TN is the most important indicator that affects the trophic states of Xiangxi River backwater area. (3)The TN in Xiangxi River backwater area mainly comes from agricultural non-point source pollution and urban sewage discharged, while the industrial wastewater from the phosphate resources exploitation in the upstream basin and some point source pollution are the main sources of CODMn and TP pollution in the water. The concentration of Chl-a is limited less by the nutrient salts such as TN and TP, and SD is affected by both planktonic algae and suspended solids in the water.

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叶许春,孟元可,张永生,等.三峡库区香溪河回水区营养状态变化特征与驱动因子[J].水资源保护,2018,34(4):80-85.(YE Xuchun, MENG Yuanke, ZHANG Yongsheng, et al. Variation characteristics of trophic states of Xiangxi River backwater area in Three Gorges Reservoir and its driving factors[J]. Water Resources Protection,2018,34(4):80-85.(in Chinese))

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  • 收稿日期:2017-09-17
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  • 在线发布日期: 2018-06-27
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