| 长江中下游不同营养水平湖泊水体环境变化特征及机制 |
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| 引用本文： | 曾海鳌,吴敬禄.长江中下游不同营养水平湖泊水体环境变化特征及机制[J].水科学进展,2007,18(6):834-841. |
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| 作者姓名： | 曾海鳌 吴敬禄 |
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| 作者单位： | 1.中国科学院南京地理与湖泊研究所, 江苏, 南京, 210008; |
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| 基金项目： | 国家自然科学基金;中国科学院知识创新工程项目 |
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| 摘 要： | 选择长江中下游49个湖泊进行不同季节的水体溶解无机氮(DIN)、总氮(TN)、总磷(TP),溶解性无机磷(DIP)以及叶绿素a(Chla)等环境参数分析,开展不同营养水平湖泊水体环境变化特征及生物响应机制研究。结果表明:DIN、TN/TP随TP的变化规律反映了不同营养水平和季节下地球化学作用的影响;氨氮(NH4-N)、TP、DIP、Chla尤其是NH4-N的季节性变化规律与营养水平关系密切;TP<0.05 mg/L时,NH4-N随总磷升高的趋势夏季大于其他季节,TN/TP与硝态氮(NO3-N)、TN相关性好,营养源组成和氨化作用是主要影响因素;0.05 mg/L4-N随总磷升高的趋势基本相同,TN/TP与亚硝态氮(NO2-N)、NO3-N、TN相关好,水生植物利用、氨化和反硝化作用是主要影响因素。TP>0.1 mg/L,冬季NH4-N随总磷升高的趋势明显大于其他季节,TN/TP在冬季和春季与TN、NO3-N相关性好,夏季和秋季与TP相关性好,其主要原因在于夏季和秋季水生植物对DIN的利用量、反硝化作用和湖泊内源释放的显著增强。
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| 关 键 词： | 硝态氮 亚硝态氮 长江中下游湖泊 |
| 文章编号： | 1001-6791（2007）06-0834-08 |
| 收稿时间： | 2006-12-15 |
| 修稿时间： | 2007-03-23 |
Characteristics and mechanismes of water environmental changes in the lakes along the middle and lower reaches of Yangtze River |
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| ZENG Hai-ao,WU Jing-lu.Characteristics and mechanismes of water environmental changes in the lakes along the middle and lower reaches of Yangtze River[J].Advances in Water Science,2007,18(6):834-841. |
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| Authors: | ZENG Hai-ao WU Jing-lu |
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| Institution: | 1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;2.Graduate School of Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | In this paper,forty-nine lakes along the middle and lower reaches of Yangtze River are chosen.Based on the analysis of the seasonal changes of environmental parameters,including dissolved inorganic nitrogen(DIN),total nitrogen(TN),total phosphorus(TP),dissolved inorganic phosphorus(DIP) and chlorophyll a(Chla),etc,the characteristics of water environmental change and the mechanisms of biological response in lakes of different nutrient levels are studied.The results show that the impacts of geochemical processes are reflected by the variational laws of lakes in different nutrient levels.The seasonal variations of Chla,ammonia nitrogen(NH4-N), DIP,TP,and TN,especially NH4-N are closely related to nutrient levels.When TP<0.05 mg /L,because NH4-N increases more quickly in winter than other seasons with TP increasing and TN/TP is closely related to nitrate nitrogen(NO3-N) and TN,the composition of nutrient sources and ammonification might be the main determinant.When 0.5 mg/L0.1 mg/L,NH4-N increases more quickly in winter than other seasons with TP increasing and TN/TP are closely related to TN and NO3-N in spring and winter,but to TP in summer and autumn.The main reasons are that the effects of hydrophyte and denitrification and the internal release of phosphorus from sediment increase significantly. |
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| Keywords: | nitrate-nitrogen nitrite-nitrogen lakes along the middle and lower reaches of Yangtze River |
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