| 蓄水前后三峡库区香溪河沉积物磷形态分布特征及释放通量估算 |
| 摘要点击 3136 全文点击 1168 投稿时间：2017-11-20 修订日期：2018-03-02 |
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| 中文关键词 三峡库区 香溪河 沉积物 磷 释放通量 |
| 英文关键词 Three Gorges Reservoir Xiangxi Bay sediment phosphorus diffusive flux |
| 作者 | 单位 | E-mail | | 刘心愿 | 三峡大学水利与环境学院, 宜昌 443002 | 848144686@qq.com | | 宋林旭 | 三峡大学水利与环境学院, 宜昌 443002 | | | 纪道斌 | 三峡大学水利与环境学院, 宜昌 443002 | 280825327@qq.com,394816707@qq.com | | 刘德富 | 湖北工业大学河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068 | | | 李欣 | 三峡大学水利与环境学院, 宜昌 443002 | | | 黄佳维 | 三峡大学水利与环境学院, 宜昌 443002 | | | 赵冲 | 三峡大学水利与环境学院, 宜昌 443002 | | | 唐咏春 | 三峡大学水利与环境学院, 宜昌 443002 | | | 平明明 | 三峡大学水利与环境学院, 宜昌 443002 | |
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| 中文摘要 |
| 三峡库区汛末蓄水过程改变了支流库湾沉积物赋存环境，继而影响沉积物磷形态的分布特征和沉积物-水界面过程.本文通过对2016年8月（蓄水前）和10月（蓄水后）香溪河库湾沉积物和上覆水样品的采集分析，分析了蓄水前后库区干流和支流库湾底部沉积物磷形态分布特征及赋存的环境条件，估算了沉积物-水界面PO43--P交换通量.结果表明：蓄水后沉积物上覆水pH增加，碱性增强；Eh减少，还原性增强.沉积物中各形态磷相对含量由NaOH-P > HCl-P > OP转变为HCl-P > OP > NaOH-P，沉积环境的改变是磷形态变化的根本原因.沉积物中TP增加了1.3倍，上覆水ρ（PO43--P）是蓄水前3.7倍，间隙水ρ（PO43--P）是蓄水前8.3倍，增加了香溪河库湾沉积物营养盐释放风险.蓄水前后香溪河沉积物PO43--P总体均表现为"源"，但PO43--P扩散通量由蓄水前的-0.0029~0.0059 mg·（m2·d）-1增加为蓄水后的0.0067~0.1071 mg·（m2·d）-1，蓄水后香溪河库湾底部沉积物磷释放量增加. |
| 英文摘要 |
| The sediment storage environment in tributaries has been altered by impoundment of water in the Three Gorges Reservoir area, affecting the distribution of phosphorus forms in sediment and processes at the sediment-water interface. Through collection of sediment and overlying water samples in Xiangxi Bay in August 2016 (before impoundment) and October (after impoundment), the distribution characteristics of sedimentary phosphorus and the environmental conditions of storage before and after impoundment were analyzed. Fluxes of PO43--P at the sediment-water interface were also estimated. Results show that pH increased, alkalinity and reducibility were enhanced, and Eh in sediments decreased after impoundment. The relative content of phosphorus in sediments changed as follows:NaOH-P > HCl-P > OP to HCl-P > OP > NaOH-P; this could be attributed to changes in the depositional environment. Compared to pre-impoundment values, TP values after impoundment in sediment, overlying water ρ(PO43--P), and interstitial water ρ (PO43--P) were 1.3 times, 3.7 times, and 8.3 times higher, increasing the risk of nutrient release in sediments of Xiangxi Bay. The manifestation of PO43--P in sendiments of Xiangxi River generally is "source" pre-impoundment and post-impoundment, but the PO43--P diffusive flux increased from -0.0029-0.0059 mg·(m2·d)-1 pre-impoundment to 0.0067-0.1071 mg·(m2·d)-1 post-impoundment. The release of phosphorus from sediments at the bottom of Xiangxi Bay increased after impoundment. |
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