| 基于生态分区的我国湖泊营养盐控制目标研究 |
| 摘要点击 2530 全文点击 1118 投稿时间：2012-08-19 修订日期：2012-10-25 |
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| 中文关键词 生态分区 湖泊富营养化 氮磷削减 控制策略 TN/TP |
| 英文关键词 ecoregion lake eutrophication nutrient reduction control strategy TN/TP |
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| 中文摘要 |
| 为更好地控制我国湖泊的富营养化水平,在五大湖泊生态分区的基础上,对不同生态分区的100个湖泊总氮(TN)、总磷(TP)、TN/TP与叶绿素a(Chl-a)的关系进行了分析,进而提出了不同生态分区的湖泊营养盐控制目标. 结果表明,五大湖泊生态分区中,东北湖区富营养化水平最低,华北湖区富营养化水平最高,近几年五大湖区湖泊富营养水平呈上升趋势. 从TN、TP对五大生态分区湖泊Chl-a浓度的影响看,TP是东北和华北湖区湖泊藻类生长的限制性营养盐,而TN和TP同时是中东部、云贵和蒙新湖区湖泊藻类生长的限制性营养盐. 从TN/TP判断,在TN/TP＜10的湖泊中,除华北湖区外的其他4个湖区湖泊Chl-a均受TN显著影响; TP仅对东北、蒙新湖区湖泊的Chl-a有显著影响. 在TN/TP>17的湖泊中,除蒙新湖区外的其他4个湖区湖泊Chl-a均受TP显著影响,而在中东部、云贵和蒙新湖区,TN对Chl-a也有显著影响. 在10＜TN/TP＜17的湖泊中,除了中东部湖区湖泊TN对Chl-a有显著影响外,其他湖区的湖泊TN和TP对Chl-a均没有显著影响. 氮磷控制策略方面,华北湖区的湖泊应以优先控磷为主; 东北湖区TN/TP＜10的湖泊应采取氮磷联合控制,其他湖泊应以控磷为主; 中东部、云贵、蒙新湖区的湖泊均应氮磷联合控制. |
| 英文摘要 |
| In order to better reduce lake eutrophication, based on five ecoregions of lakes, the relationships of total nitrogen (TN), total phosphorus (TP), and TN/TP ratio with chlorophyll-a (Chl-a) in 100 lakes were discussed, furthermore, strategies of nutrient control were proposed respectively. Results showed that among the five ecoregions, the lake eutrophication level was the lowest in Dongbei ecoregion and the highest in Huabei ecoregion, but the eutrophication level in lakes of all the five ecoregions is increasing in recent years. Algal growth in lakes of Dongbei and Huabei ecoregions was limited by phosphorus, while it was simultaneously limited by nitogen and phosphorus in lakes of other three ecoregions (Zhongdongbu, Yungui and Mengxin). In lakes with TN/TP＜10, significant correlation between Chl-a concentration and TN was found in lakes of the five ecoregions except for Huabei ecoregion, and significant correlation between Chl-a concentration and TP was found in lakes of Dongbei and Mengxin ecoregions. In lakes with TN/TP＞17, significant correlation between Chl-a concentration and TP was found in lakes of the five ecoregions except for Mengxin ecoregion, and significant correlation between Chl-a concentration and TN was found in lakes of Zhongdongbu, Yungui and Mengxin ecoregions. In lakes with 10＜TN/TP＜17, no significant correlation between Chl-a and TN (or TP) was found in lakes of all ecoregions except for Zhongdongbu ecoregion where Chl-a concentration was significantly affected by TN. As for strategies of nutrient control and reduction in the five ecoregions, lakes of Huabei ecoregion should adopt TP control in priority, and in Dongbei ecoregion, TP and TN should be controlled simultaneously in lakes with TN/TP ＜10, while other lakes should focus on TP control. Lakes in other three ecoregions (Zhongdongbu, Mengxin and Yungui) should control TP and TN simultaneously. |
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