| 湿地沉积物-水界面营养盐交换的定量估算 |
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| 引用本文： | 古小治,张雷,柏祥,申秋实,王兆德,范成新.湿地沉积物-水界面营养盐交换的定量估算[J].水科学进展,2011,22(1):75-83. |
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| 作者姓名： | 古小治 张雷 柏祥 申秋实 王兆德 范成新 |
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| 作者单位： | 1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 江苏, 南京, 210008; |
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| 基金项目： | “十一五”国家科技支撑计划资助项目(2006BAC10B03); 国家水体污染控制与治理科技重大专项(2008ZX07103-003); 江苏省社会发展计划资助项目(BE2009603)~~ |
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| 摘 要： | 为有效控制湖泊内源营养盐的释放,探讨了不同物理改良措施(覆沙、底质疏松)对沉积物-水界面营养盐的释放通量控制效果。利用原位孔隙水采样技术(Peeper)来获得沉积物孔隙水剖面,对改良后湿地沉积物孔隙水营养盐的垂向分布及其扩散通量进行了研究。结果发现,改良后沉积含水率、孔隙率分别提高了91%和54%。水土界面附近,随剖面深度增加,孔隙水中PO43-、NH4+、NO3-及NO2-浓度分布符合指数关系,PO43-、NH4+在8 cm左右达到最大值。种植芦苇后沉积物孔隙水中PO43-、NH4+均有不同程度的下降,改良措施能有效降低表层弱结合态磷在总磷中比例但增加铁磷的比例,种植芦苇可强化这一效应。运用Fick第一定律对剖面孔隙水营养盐的扩散通量进行估算,发现沉积物经疏松后,NH4+、PO43-的扩散通量由57.47~72.19μg/(m2·d)和2.55~3.21μg/(m2·d)变为-95.54~-130.94μg/(m2·d)和1.50~2.05μg/(m2·d),可考虑疏松沉积物-水界面附近沉积物来作为控制湖泊内源污染的有效手段之一。
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| 关 键 词： | 湿地沉积物 覆沙 底泥疏松 原位孔隙水 扩散通量 |
| 收稿时间： | 2010-01-05 |
Nutrient exchange across sediment-water interface in wetlands |
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| GU Xiao-zhi,ZHANG Lei,BAI Xiang,SHEN Qiu-shi,WANG Zhao-de,FAN Cheng-xin.Nutrient exchange across sediment-water interface in wetlands[J].Advances in Water Science,2011,22(1):75-83. |
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| Authors: | GU Xiao-zhi ZHANG Lei BAI Xiang SHEN Qiu-shi WANG Zhao-de FAN Cheng-xin |
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| Affiliation: | 1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;2.Graduate University of Chinese Academy of Sciences, Beijing 100039, China;3.College of Resource and Environment, Agricultural University of Nanjing, Nanjing 210095, China |
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| Abstract: | In order to reducing benthic nutrients release,we investigate the effectiveness of three physical amelioration measures(fine sand covered,sediment loosened,and reed planting) on the diffusive flux from sediment-overlying water.An in-situ sampling technique(Peeper) was employed to obtain the vertical distribution of nutrient elements and diffusive fluxes on the Nansi Lake in China.The results show that in the case of all three amelioration measures,the sediment water content and porosity have increased by 91... |
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| Keywords: | wetland sediments fine sand covered sediment loosened in-situ pore water diffusive fluxes |
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