本文關(guān)鍵詞：沉積物硝酸鹽異化還原過程的溫度敏感性與影響因素——以長(zhǎng)江口青草沙水庫(kù)為例　出處：《中國(guó)環(huán)境科學(xué)》2016年09期 　論文類型：期刊論文

  更多相關(guān)文章： 同位素示蹤 硝酸鹽異化還原 溫度敏感性 沉積物 青草沙水庫(kù)

【摘要】：水生態(tài)環(huán)境中硝酸鹽異化還原過程反硝化、厭氧氨氧化和硝酸鹽異化還原成銨(DNRA),對(duì)氮循環(huán)起著重要作用.采用泥漿培養(yǎng)實(shí)驗(yàn),并結(jié)合15N同位素示蹤技術(shù)對(duì)長(zhǎng)江口青草沙水庫(kù)沉積物硝酸鹽異化還原過程的溫度敏感性及影響因子進(jìn)行了研究.結(jié)果表明,原位溫度10℃時(shí)沉積物中反硝化、厭氧氨氧化和DNRA速率分別是0.18~6.86、0.26~3.16和0.09~0.25μmol N/(kg·h).當(dāng)培養(yǎng)溫度升高到20℃和30℃時(shí),反硝化速率分別是0.43~6.22和0.68~6.56μmol N/(kg·h),平均比10℃時(shí)升高了15.7%和21.6%;厭氧氨氧化速率分別是0.61~3.2和0.77~3.54μmol N/(kg·h),平均比10℃時(shí)升高了27.8%和42.6%;DNRA速率分別是0.09~0.23和0.1~0.18μmol N/(kg·h),均比10℃時(shí)降低了4.2%.沉積物厭氧氨氧化對(duì)溫度最為敏感,其次是反硝化,均隨溫度升高而增大;而DNRA最不敏感,隨溫度升高而減小.相關(guān)性分析結(jié)果發(fā)現(xiàn)有機(jī)碳、氨氮、二價(jià)鐵和硫化物是影響硝酸鹽異化還原的主要環(huán)境因子.反硝化和厭氧氨氧化硝酸鹽還原的貢獻(xiàn)分別是34%~71%和28%~49%,而DNRA為2%~17%.青草沙水庫(kù)沉積物反硝化和厭氧氨氧化過程每年可去除活性氮大約為3.25×103t和1.68×103t,約占庫(kù)區(qū)輸入氮的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】： 中國(guó)環(huán)境科學(xué) 2016,36(9) ： 2624~2632 China Environmental Science 沉積物硝酸鹽異化還原過程的溫度敏感性與影響因素 ——以長(zhǎng)江口青草沙水庫(kù)為例 胡曉婷 1 , 程 呂 1 , 林賢彪 1 , 劉 敏 1 , 陸 敏 1 , 侯立軍，

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