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水体氧动态对氮磷地球化学行为的影响

古小治 孙淑雲 张启超 范成新 陈开宁

古小治, 孙淑雲, 张启超, 范成新, 陈开宁. 水体氧动态对氮磷地球化学行为的影响[J]. 环境科学研究, 2015, 28(10): 1524-1530.
引用本文: 古小治, 孙淑雲, 张启超, 范成新, 陈开宁. 水体氧动态对氮磷地球化学行为的影响[J]. 环境科学研究, 2015, 28(10): 1524-1530.
GU Xiaozhi, SUN Shuyun, ZHANG Qichao, FAN Chengxin, CHEN Kaining. Influence of Anaerobic and Aerobic Processes on Dissolved Nitrogen and Phosphorus Nutrient Distribution and Exchange Process Across the Sediment-Water Interface[J]. Research of Environmental Sciences, 2015, 28(10): 1524-1530.
Citation: GU Xiaozhi, SUN Shuyun, ZHANG Qichao, FAN Chengxin, CHEN Kaining. Influence of Anaerobic and Aerobic Processes on Dissolved Nitrogen and Phosphorus Nutrient Distribution and Exchange Process Across the Sediment-Water Interface[J]. Research of Environmental Sciences, 2015, 28(10): 1524-1530.

水体氧动态对氮磷地球化学行为的影响

基金项目: 国家自然科学基金项目(41203064);江苏省自然科学基金项目(BK20131465);中国科学院重点部署项目(KZZD-EW-10-05)

Influence of Anaerobic and Aerobic Processes on Dissolved Nitrogen and Phosphorus Nutrient Distribution and Exchange Process Across the Sediment-Water Interface

  • 摘要: 底层水体氧动态直接制约着许多与底栖生物的生物、生态行为息息相关的生物地球化学过程. 高分辨率(垂向分辨率为3 mm)的原位采样技术能精确地获取ρ(PO43--P)和ρ(NH4+-N)在沉积物-水界面微环境的分布特征,这对准确掌握营养盐在该区域发生的独特的生物地球化学过程至关重要. 研究表明,连续曝氮气或空气下,孔隙水中ρ(NH4+-N)显著提高,升温使该效应进一步增强. 在常温下,曝空气沉积物孔隙水中ρ(PO43--P)显著下降,曝氮气则无显著影响;但厌氧条件下升温至35 ℃时ρ(PO43--P)显著增加. 在低氧和厌氧时,PO43--P从沉积物向水体的扩散速率(以P计)为10.41~25.85 mg/(m2·d);但底层DO充足或CaO2添加剂量为5 g/m2致ρ(DO)呈过饱和状态时,PO43--P释放速率从0.07 mg/(m2·d)进一步降至-17.20 mg/(m2·d),说明随着ρ(DO)的升高,PO43--P有进一步削减的潜力. PO43--P在界面处的释放强度显著依赖于氧气和温度的动态. 总体来看,DO充足时,NH4+-N和PO43--P的地球化学循环过程表现为从上覆水向沉积物吸附固定;当升温或缺氧时,这一过程可能被抑制甚至发生逆转.

     

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出版历程
  • 收稿日期:  2014-12-18
  • 修回日期:  2015-04-15
  • 刊出日期:  2015-10-25

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