引用本文:李欣,纪道斌,宋林旭,苏青青,陈秀秀,刘德富,等.香溪河沉积物-水界面的营养盐交换特征[J].环境科学研究,2017,30(8):1212-1220.
LI Xin,JI Daobin,SONG Linxu,SU Qingqing,CHEN Xiuxiu,LIU Defu,et al.Characteristics of Nutrient Exchange at the Sediment-Water Interface in Xiangxi Bay[J].Reserrch of Environmental Science,2017,30(8):1212-1220.]
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香溪河沉积物-水界面的营养盐交换特征
李 欣1, 纪道斌1, 宋林旭1, 苏青青1, 陈秀秀1, 刘德富2
1.三峡大学水利与环境学院, 湖北 宜昌 443002 ;2.湖北工业大学, 河湖生态修复与藻类利用湖北省重点实验室, 湖北 武汉 430068
摘要:
为研究香溪河库湾沉积物-水界面的营养盐交换特征,于2016年6月采集香溪河库湾上覆水和沉积物间隙水样品,分析不同形态氮、磷的空间分布特征并进行相关性分析,计算沉积物-水界面氮、磷的释放通量. 结果表明:香溪河库湾上覆水和沉积物间隙水中ρ(TP)的变化范围分别为0.484~0.927和0.511~2.220 mg/L,ρ(TN)的变化范围分别为0.739~4.302和3.571~14.011 mg/L;上覆水和沉积物间隙水中氮、磷质量浓度在沿程和垂向上具有一定的变化规律,上游区域沉积物间隙水中氮、磷质量浓度大于下游区域,沉积物间隙水中氮、磷质量浓度明显大于上覆水;香溪河沉积物总体上表现为PO43--P和NH4+-N的“源”,中下游区域沉积物表现为NO3--N的“源”,而中上游区域表现为NO3--N的“汇”;PO43--P的释放通量范围为0.129~0.339 mg/(m2·d),NH4+-N的释放通量范围为0.213~1.415 mg/(m2·d),NO3--N的释放通量范围为-1.109~3.446 mg/(m2·d). 研究显示,上覆水的环境条件对于沉积物-水界面营养盐交换存在一定的影响,但影响程度各有不同.
关键词:  香溪河  营养盐  沉积物-水界面  释放通量
DOI:
分类号:
基金项目:国家重点基础研究发展计划(973)项目(2014CB460601);国家科技合作与交流专项项目(2014DFE70070);国家自然科学基金青年基金项目(51509086)
Characteristics of Nutrient Exchange at the Sediment-Water Interface in Xiangxi Bay
LI Xin1, JI Daobin1, SONG Linxu1, SU Qingqing1, CHEN Xiuxiu1, LIU Defu2
1.College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China ;2.School of Civil Engineering, Architecture and Environment, Key laboratory of Hubei Province for Lake Ecological Restoration and Algae in the Laboratory, Hubei University of Technology, Wuhan 430068, China
Abstract:
Abstract: Overlying and sediment interstitial water samples from Xiangxi Bay were collected in June 2016 to study the nutrient exchange between sediment and water interfaces. The spatial distribution of nitrogen and phosphorus in the sediment was investigated, and correlation analysis between them was conducted. The results showed that the phosphorus concentration in the overlying water and sediment interstitial water of Xiangxi Bay ranged from 0.484 to 0.927 mg/L and 0.511 to 2.220 mg/L, respectively, and the nitrogen concentration ranged from 0.739 to 4.302 mg/L and 3.571 to 14.011 mg/L. The nitrogen and phosphorus concentrations in the overlying and interstitial water of the sediments had a certain variation along the stream and vertically. The interstitial water nitrogen and phosphorus concentrations in the upstream area were higher than those in the downstream area. The interstitial water nitrogen and phosphorus concentrations in the sediment were significantly larger than those in the overlying water. Xiangxi Bay sediment acts as a source of PO43--P and NH4+-N; however, for NO3--N it is a source in the middle and lower reaches and a sink in the upstream region. The diffusive flux of PO43--P ranged from 0.129 to 0.339 mg/(m2·d); the diffusive flux of NH4+-N ranged from 0.213 to 1.415 mg/(m2·d); and the diffusive flux of NO3--N ranged from -1.109 to 3.446 mg/(m2·d). The environmental conditions of the overlying water have some influence on the nutrient exchange of the sediment-water interface, but the degree of influence is different.
Key words:  Xiangxi Bay  nutrient  sediment-water interface  diffusive flux