沉积物硝酸盐异化还原过程的温度敏感性与影响因素——以长江口青草沙水库为例

发布时间：2017-12-27 07:06

  本文关键词：沉积物硝酸盐异化还原过程的温度敏感性与影响因素——以长江口青草沙水库为例　出处：《中国环境科学》2016年09期 　论文类型：期刊论文

  更多相关文章： 同位素示踪 硝酸盐异化还原 温度敏感性 沉积物 青草沙水库

【摘要】：水生态环境中硝酸盐异化还原过程反硝化、厌氧氨氧化和硝酸盐异化还原成铵(DNRA),对氮循环起着重要作用.采用泥浆培养实验,并结合15N同位素示踪技术对长江口青草沙水库沉积物硝酸盐异化还原过程的温度敏感性及影响因子进行了研究.结果表明,原位温度10℃时沉积物中反硝化、厌氧氨氧化和DNRA速率分别是0.18~6.86、0.26~3.16和0.09~0.25μmol N/(kg·h).当培养温度升高到20℃和30℃时,反硝化速率分别是0.43~6.22和0.68~6.56μmol N/(kg·h),平均比10℃时升高了15.7%和21.6%;厌氧氨氧化速率分别是0.61~3.2和0.77~3.54μmol N/(kg·h),平均比10℃时升高了27.8%和42.6%;DNRA速率分别是0.09~0.23和0.1~0.18μmol N/(kg·h),均比10℃时降低了4.2%.沉积物厌氧氨氧化对温度最为敏感,其次是反硝化,均随温度升高而增大;而DNRA最不敏感,随温度升高而减小.相关性分析结果发现有机碳、氨氮、二价铁和硫化物是影响硝酸盐异化还原的主要环境因子.反硝化和厌氧氨氧化硝酸盐还原的贡献分别是34%~71%和28%~49%,而DNRA为2%~17%.青草沙水库沉积物反硝化和厌氧氨氧化过程每年可去除活性氮大约为3.25×103t和1.68×103t,约占库区输入氮的54.17%.
[Abstract]:Dissimilatory nitrate reduction process of water ecological environment in denitrification and anaerobic ammonia oxidation and dissimilatory nitrate reduction to ammonium (DNRA), which plays an important role in the nitrogen cycle. The mud culture experiments combined with 15N isotope tracer technique in the Yangtze River estuary grass sand reservoir sediment nitrate reduction of different temperature sensitivity and influence factor of process were studied. The results showed that the in situ temperature 10 OC in sediment denitrification and anaerobic ammonia oxidation and DNRA rate were 0.18~6.86, 0.26~3.16 and 0.09~0.25 mol N/ (kg - H). When the culture temperature rises to 20 degrees and 30 degrees, the denitrification rate is respectively 0.43~6.22 and 0.68~6.56 mol N/ (kg h), average 10 degrees increased by 15.7% and 21.6%; anaerobic ammonia oxidation rate respectively is 0.61~3.2 and 0.77~3.54 mol N/ (kg h), the average ratio of 10 degrees increased by 27.8% and 42.6%; the rate of DNRA is 0.09~0.23 and 0.1~0.18 respectively. Mol (N/ Kg - H), were more than 10 DEG C reduced 4.2%. sediment anaerobic ammonia oxidation was most sensitive to the temperature, followed by denitrification, increases with temperature increasing; and the DNRA is not sensitive, decreases with the increasing temperature. The correlation analysis results showed that the organic carbon, nitrogen, and two valent iron sulfide is the main effect environmental factors of dissimilatory nitrate reduction. Denitrification and anammox nitrate reduction contribution respectively is 34%~71% and 28%~49%, DNRA and 2%~17%. in Qingcaosha Reservoir sediment denitrification and anaerobic ammonia oxidation process can remove reactive nitrogen per year is about 3.25 * 103t and 1.68 * 103t, about 54.17%. of nitrogen input area
【正文快照】： 中国环境科学 2016,36(9) ： 2624~2632 China Environmental Science 沉积物硝酸盐异化还原过程的温度敏感性与影响因素 ——以长江口青草沙水库为例 胡晓婷 1 , 程 吕 1 , 林贤彪 1 , 刘 敏 1 , 陆 敏 1 , 侯立军，

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