| 风浪扰动下湖滨带悬浮物和营养盐响应特征 |
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| 引用本文： | 周阳,刘金娥,许晓光,祁闯,吴馨婷,林卉,石款.风浪扰动下湖滨带悬浮物和营养盐响应特征[J].湖泊科学,2018,30(4):948-956. |
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| 作者姓名： | 周阳 刘金娥 许晓光 祁闯 吴馨婷 林卉 石款 |
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| 作者单位： | 南京师范大学环境学院;江苏省地理信息资源开发与利用协同创新中心江苏省环境演变与生态建设重点实验室江苏省水土环境生态修复工程实验室 |
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| 基金项目： | 国家自然科学基金面上项目（41573061）和江苏省太湖水环境综合治理科研项目（JSZC-G2014-212）联合资助. |
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| 摘 要： | 为研究风浪扰动下沉积物起悬过程中悬浮物浓度的分布特征和水体营养盐时空分布状况,以太湖西北湖滨带为例,选择代表4种不同生境的6个点位进行了连续12 d的野外观测.利用高精度分层同步采样装置,采用重量法计算悬浮量,并对悬浮过程中总磷(TP)、总氮(TN)、铵态氮(NH_4~+-N)和硝态氮(NO_3~--N)浓度进行分析.结果表明:风速是引起太湖西北湖滨带水体悬浮物增加的主要因素,沉积物悬浮的临界风速为3.6 m/s.各点位悬浮物浓度的均值差异明显,表现为:无植被区植被区河口区湖心区.太湖西北湖滨带水体氮、磷浓度日变化幅度较大,TN浓度为1.82~4.96 mg/L,TP浓度为0.10~1.47 mg/L.NH_4~+-N和NO_3~--N浓度分别在0.09~2.83和1.05~3.69 mg/L之间波动.近岸无植被区水柱的总悬浮量与风速的相关性最好,相关系数达到0.722;而远岸湖心区与风速的相关系数仅为0.039.悬浮物浓度除了受风情(风向和风速)的影响外,同样受水深、地形特征和水生植被的影响.
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| 关 键 词： | 太湖 底泥悬浮 风速 营养盐 悬浮物 |
| 收稿时间： | 2017/10/20 0:00:00 |
| 修稿时间： | 2017/11/23 0:00:00 |
Response of suspended solids and dissolved nutrients in littoral zone of Lake Taihu under wind-wave disturbances |
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| ZHOU Yang,LIU Jin''e,XU Xiaoguang,QI Chuang,WU Xinting,LIN Hui and SHI Kuan.Response of suspended solids and dissolved nutrients in littoral zone of Lake Taihu under wind-wave disturbances[J].Journal of Lake Science,2018,30(4):948-956. |
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| Authors: | ZHOU Yang LIU Jin'e XU Xiaoguang QI Chuang WU Xinting LIN Hui and SHI Kuan |
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| Institution: | School of Environment, Nanjing Normal University, Nanjing 210097, P. R. China,School of Environment, Nanjing Normal University, Nanjing 210097, P. R. China;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Institute of Water Environmental Eco-remediation, Nanjing 210023, P. R. China,School of Environment, Nanjing Normal University, Nanjing 210097, P. R. China;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Institute of Water Environmental Eco-remediation, Nanjing 210023, P. R. China,School of Environment, Nanjing Normal University, Nanjing 210097, P. R. China,School of Environment, Nanjing Normal University, Nanjing 210097, P. R. China,School of Environment, Nanjing Normal University, Nanjing 210097, P. R. China and School of Environment, Nanjing Normal University, Nanjing 210097, P. R. China |
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| Abstract: | To understand the spatiotemporal characteristics of suspended solid concentration and nutrients under different wind-wave conditions in the northwestern littoral zone, Lake Taihu, six sites representing four biotopes were investigated for twelve days. The quantity of suspended solids were calculated by gravimetric method and the contents of total phousphorus, total nitrogen, nitrate nitrogen and ammonium nitrogen were analyzed by the high-accuracy layered sampling apparatus. The results showed that the wind speeds were the major factor leading to the increase of the suspended solids in the western Lake Taihu littoral zone and the critical wind speed was 3.6 m/s. The mean concentration of suspended solids in each site was obviously different:non-vegetation areas > vegetation areas > estuary areas > open water areas. The diurnal variation of nitrogen and phosphorous contents were significant, with the total nitrogen of 1.82-4.86 mg/L and the total phosphors of 0.10-1.47 mg/L. The content of ammonium nitrogen was changed between 0.09-2.83 mg/L and nitrate nitrogen was 1.05-3.69 mg/L. In the nearshore non-vegetated areas, the correlation between the total suspended solids and the wind speeds was the strongest with the correlation coefficient of 0.722, while it was only 0.039 in the offshore areas. In addition to the influence of wind speeds, the concentration of suspended solids was also affected by the water depth, topography and aquatic vegetation. |
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| Keywords: | Lake Taihu sediment suspension wind speed nutrient suspended solid |
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