青藏高原腹地溪流中的氮和有机碳及其相互关系
Nitrogen and Organic Carbon and Their Relationship in Streams of Nitrogen and Organic Carbon and Their Relationship in Streams of Qinghai-Tibet Plateau HinterlandQinghai-Tibet Plateau Hinterland
查看参考文献41篇
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文摘
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氮和有机碳都是溪流中非常重要的物质,其相互关系是生物圈中最基本的生物地球化学联系之一.实地调查了青藏高原腹地溪流中氮和有机碳的状况,并对氮和有机碳之间的关系进行了探讨.结果表明,NO_3~-N是青藏高原腹地溪流中总氮(TN)的主要成分,占80.4%.在溪流中TN的变异性小于NO_3~-N的变异性,NH_4~-N的变异性最大.总有机碳(TOC)主要由溶解性有机碳(DOC)组成,占86.5%,DOC的变异性略大于TOC的变异性.溪流水体中的C:N比值很低,平均值仅为2.632,且都低于Hillebrand和Sommer提出的比值(C:N=119:17),说明溪流中的微生物主要受C限制.有机碳与TN和NH_4~-N没有显著相关性,与NO_3~-N负相关.NO_3~-N:TN与有机碳负相关,而NH_4~-N:TN与有机碳没有显著相关性.有机碳与C:N显著正相关,TN和NO_3~-N与C:N显著负相关,NH_4~-N与C:N无显著相关性. |
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其他语种文摘
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Nitrogen and organic carbon are very important substances in stream water. Their mutual relationship is one of the basic biogeochemical contacts in biosphere. According to field surveys on the streams of Qinghai-Tibet Plateau hinterland, we analyzed the nitrogen and organic carbon in these streams, and discussed their complex relationships. The results showed that, NO_3-N was the main component of TN in these streams, accounting for 80.4%. The variability of TN was less than that of NO_3-N, with that of NH_4-N the highest. TOC was mainly composed of DOC, with the ratio of 86.5%. The variability of DOC was slightly larger than that of TOC. The C:N ratio was very low in the streams, averaging 2.632, lower than the ratio (C:N=119:17) put forward by Hillebran and Sommer, showing that the microorganisms in streams were limited by carbon. Organic carbon was not significantly related to TN or NH_4-N, but negatively correlated with NO_3-N. Organic carbon was negatively related to NO_3-N:TN, but had no significant relationship with NH_4-N:TN. The C:N ratio had significant positive relationship with organic carbon, explicit negative correlation with TN and NO_3-N, but no significant relationship with NH_4-N. |
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来源
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应用与环境生物学报
,2013,19(3):532-536 【核心库】
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DOI
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10.3724/sp.j.1145.2013.00532
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关键词
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有机碳
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氮
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青藏高原
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溪流
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地址
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中国科学院水生生物研究所, 淡水生态与生物技术国家重点实验室, 武汉, 430072
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1006-687X |
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学科
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普通生物学;环境科学基础理论 |
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基金
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国家自然科学基金项目
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国家水体污染控制与治理科技重大专项
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文献收藏号
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CSCD:4870816
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