Quantitative Aspects of the Nitrogen Cycle
Quantitative Aspects of the Nitrogen Cycle
复制标题
氮循环的定量方面
DOI：
10.1007/978-94-017-8944-8_21
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
A. Nishri
中科院分区：
文献类型：
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作者：
A. Nishri
本章讨论了Kinneret湖氮循环的定量方面，包括其来源和汇。对分层期NH4+从下层水体到表层的内部通量进行了深入的讨论。此外，该湖的大部分氮去除是通过一个联合过程（可能是异化硝酸盐还原为亚硝酸盐（DNRN），然后是厌氧氨氧化（anammox））排放N2(g)来实现的。在这些过程中，在分层开始时锁定在LWM中的no3通过DNRN的异养活性转化为no2，而NH4+则通过沉淀在表层的有机物的降解贡献，从而促进厌氧氨氧化的发生。这两种生物过程都发生在亚氧LWM中，造成了大约70%的年河流氮流入该湖。这就只剩下大约三分之一从河流来源引入的氮可以在下一个年度循环中使用。
This chapter discusses the quantitative aspects of the nitrogen cycle in Lake Kinneret including its sources and sinks. A thorough discussion is devoted to the internal flux of NH4+from the lower water mass (LWM) to the epilimnion during the stratified period. Also, it is shown that most nitrogen removal from this lake occurs by emitting N2(g) through a combined process of presumably dissimilatory nitrate reduction to nitrite (DNRN) which is followed by anaerobic ammonium oxidation (anammox). In these processes, NO3locked in the LWM at the onset of stratification is claimed to be converted to NO2through DNRN heterotrophic activity, while the NH4+is contributed through degradation of organic matter settling from the epilimnion, thus facilitating the occurrence of anammox. Both biotic processes which occur in the sub-oxic LWM account for the removal of approximately 70 % of the annual riverine N inflows to this lake. This leaves only about one third of the N introduced from riverine sources to be used in the following annual cycle.