| 武汉月湖沉积物不同形态氮含量与转换途径的垂直变化 |
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| 引用本文： | 陈国元,李建秋,李清曼,周易勇.武汉月湖沉积物不同形态氮含量与转换途径的垂直变化[J].湖泊科学,2008,20(4):463-469. |
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| 作者姓名： | 陈国元 李建秋 李清曼 周易勇 |
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| 作者单位： | [1]中国科学院水生生物研究所,武汉430072 [2]中国科学院研究生院,北京100049 |
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| 基金项目： | 中国科学院知识创新工程重要方向项目(KZCX2-YW-426);;国家自然科学基金重点项目(40730528)联合资助 |
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| 摘 要： | 描述了2005年6月月湖4个采样点沉积物不同形态氮含量、净硝化速率、净氮矿化速率与硝酸还原酶活性的垂直分布．亚表层（5—10cm）交换态NO3＋-N含量最高，而有效态氮与交换态NH4＋-N含量最低，故具临界意义．有效态氮多以交换态NH4＋-N的形式贮存于表层（0—5cm）与底层（〉10cm），且底层含量较高，这种分布与缺氧状态有关．表层沉积物总氮和有机态氮含量、净硝化速率、净氮矿化速率与硝酸还原酶活性均高，间隙水中NH4＋-N浓度亦取峰值，而溶解态N03--N浓度最低，据此提出氮循环的基本过程：有机态氮经矿化与硝化产生NH4＋-N与NO3-N，同时导致有利于NH4＋-N生成的缺氧状态，并促使部分NO3-N异化还原为NH4＋-N，二者共同构成表层间隙水中丰富的NH4＋-N源，总之，富营养化湖泊表层沉积物富含有机态氮，故为氮生物地球化学循环的最为活跃的层面，而NH4＋-N则为最具有效性且含量最高的形态．
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| 关 键 词： | 月湖 沉积物 氮含量 转换途径 垂直变化 |
| 收稿时间： | 2007/5/10 0:00:00 |
| 修稿时间： | 2007/7/10 0:00:00 |
Different forms of nitrogen contents and their vertical variations of transformation modes of the sediments of Lake Yuehu, Wuhan |
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| CHEN Guo-yuan,LI Jian-qiu,LI Qing-man and ZHOU Yi-yong.Different forms of nitrogen contents and their vertical variations of transformation modes of the sediments of Lake Yuehu, Wuhan[J].Journal of Lake Science,2008,20(4):463-469. |
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| Authors: | CHEN Guo-yuan LI Jian-qiu LI Qing-man and ZHOU Yi-yong |
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| Institution: | 1: Institute of Hydrobiology;Chinese Academy of Sciences;Wuhan 430072;P.R.China;2: Graduate School of Chinese Academy of Sciences;Beijing 100049;P.R.China |
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| Abstract: | Vertical distributions of nitrogen contents, net nitrification rates, net N-mineralization rates and nitrate reductase activities in sediments of Lake Yuehu in June, 2005, were described on basis of four samples from the lake. The results showed that there was a critical layer in which exchangeable nitrate contents were the highest. Exchangeable ammonium and available nitrogen contents were the lowest in the subsurface sediment (5-10cm). Available nitrogen was stored mainly in the form of exchangeable ammon... |
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| Keywords: | Lake Yuehu sediment nitrogen contents transformation modes vertical variations |
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