| 三峡水库试验性蓄水前后大宁河富营养化状态比较 |
| 摘要点击 2822 全文点击 1407 投稿时间：2011-11-02 修订日期：2012-03-25 |
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| 中文关键词 富营养化指数 水文特征 "二维坐标理论" 大宁河 三峡水库 |
| 英文关键词 trophic state indices hydrological factors two-dimensional graphical approach Daning River Three Gorges Reservoir |
| 作者 | 单位 | E-mail | | 张佳磊 | 中国环境科学研究院,环境基准与风险评估国家重点实验室,北京 100012
中国环境科学研究院国家环境保护饮用水水源地保护重点实验室,北京 100012 | zhangjialei@craes.org.cn | | 郑丙辉 | 中国环境科学研究院,环境基准与风险评估国家重点实验室,北京 100012
中国环境科学研究院国家环境保护饮用水水源地保护重点实验室,北京 100012 | zhengbh@craes.org.cn | | 刘录三 | 中国环境科学研究院,环境基准与风险评估国家重点实验室,北京 100012 | | | 王丽婧 | 中国环境科学研究院,环境基准与风险评估国家重点实验室,北京 100012
中国环境科学研究院国家环境保护饮用水水源地保护重点实验室,北京 100012 | | | 吴光应 | 巫山县环境监测站,巫山 404700 | |
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| 中文摘要 |
| 基于大宁河试验性蓄水阶段(2005-09~2007-09)和正常运行阶段(2008-09~2010-09)的监测数据,对大宁河试验性蓄水前后富营养化状态进行比较,在此基础上运用Carlson的"二维坐标理论"和数理统计分析方法,探究大宁河富营养状态限制因素. 结果表明,和试验性蓄水阶段相比,正常运行阶段整个研究区域TSITP呈显著上升趋势,从大宁河回水末端至长江干流,增加幅度沿程依次为23.29%、19.57%、15.58% 和14.12%; TSISD和TSITN维持稳定; TSICHL总体维持稳定,仅回水末端(S1)呈上升趋势,上升幅度为17.34%. 从长江干流至大宁河回水末端,TSITN、TSITP 和TSISD这3个营养状态指数均呈现沿程降低的趋势; TSICHL呈现回水区(S2)和出水口(S3)较高,长江干流(S4)和回水末端(S1)较低. 试验性蓄水前后各水文期特征基本呈现一致. TSITN和TSITP水文期特征表现为:汛限期、泄水期>高水位运行期>蓄水期; TSICHL水文期特征表现为:汛限期>蓄水期、泄水期>高水位运行期; TSISD水文期特征表现为:汛限期、泄水期>蓄水期>高水位运行期. 正常运行期和试验性蓄水期相比,TSITN、TSITP和TSICHL在各个水文期之间的差异变小. 长江干流和大宁河总氮和总磷已经超过了富营养化状态的临界值,因此营养盐并不是水体富营养化状态的限制因素; 非藻类浊度控制水下光衰减而成为限制藻类生产力的关键因素. 非藻类浊度和水下光照分布受到水文学特征季节动态的强烈干扰. |
| 英文摘要 |
| We evaluated 4-year data set to assess the trophic state and limiting factors of the Three Gorges Reservoir (TGR) during the experimental impounding period (September 2005 to September 2007) and the normal operating period (September 2008 to September 2010). The results indicated that there had been appeared new characteristics in spatial and temporal distribution of trophic state indices after impoundment. The trophic state indices (TSITP) showed increased trend after the TGR impoundment during the study area, but TSITN and TSISD had no significant changes after the TGR impoundment. The values of TSICHLshowed increased trend after the TGR impoundment in S1, and the values of TSICHL did not show obvious changes in S2, S3 and S4 after the TGR impoundment. The values of TSITN, TSITPand TSISDshow similar spatial variances with the highest value in S4, followed in a descending order by S3, S2 and S1.TSICHL in the S2 and S3 were higher than that in S1 and S4. According to the characteristics of water level, the operational period of the TGR classified into following four stages: stage I (pre-November-April), stage Ⅱ (May-July), stage Ⅲ (July-September) and stage Ⅳ (September-November). The values of TSITN and TSITP in the Daning River and the TGR mainstream showed similar seasonal variances with the highest value in the stage Ⅱ and Ⅲ, followed in a descending order by stage I and Ⅳ. The values of TSICHLvaried substantially among the four stages, with the highest value in stage Ⅲ, followed by stage Ⅱ, Ⅳ and I. The trophic state indices differences were getting smaller between the four stages after the TGR impoundment. Using Carlson's two-dimensional approach, deviations of the TSIS indicated that factors other than phosphorous and nitrogen limited algal growth and that nonalgal particles affected light attenuation. These findings were further supported by the significant correlation among the values of TSI and hydrological factors. |
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