Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea.
Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea.
Mar Pollut Bull. 2018 Apr;129(1):275-283. doi: 10.1016/j.marpolbul.2018.02.037. Epub 2018 Mar 23.
Constructed coastal marsh regulates land-born nitrogen (N) loadings through salinity-dependent microbial N transformation processes. A hypothesis that salinity predominantly controls N removal in marsh was tested through incubation in a closed system with added-NH using sediments collected from five sub-marshes in Shihwa marsh, Korea. Time-course patterns of concentrations and N-atom% of soil-N pools were analyzed. Sediments having higher salinity and lower soil organic-C and acid-extractable organic-N exhibited slower rates of N mineralization and immobilization, nitrification, and denitrification. Rates of denitrification were not predicted well by sediment salinity but by its organic-C, indicating heterotrophic denitrification. Denitrification dominated N-loss from this marsh, and nitrogen removal capacity of this marsh was estimated at 337 kg N day (9.9% of the daily N-loadings) considering the current rooting depth of common reeds (1.0 m). We showed that sediment N removal decreases with increasing salinity and can increase with increasing organic-C for heterotrophic denitrification.
人工沿海湿地通过盐度依赖的微生物氮转化过程来调节陆地输入的氮（N）负荷。本研究通过在一个添加 NH 的封闭系统中使用从韩国始华湖的五个亚湿地采集的沉积物进行的添加-NH 的培养，来检验盐度主要控制湿地中 N 去除的假说。分析了土壤-N 库的浓度和 N 原子%的时间进程模式。具有较高盐度、较低土壤有机碳和酸提取有机 N 的沉积物表现出较慢的氮矿化和固定、硝化和反硝化速率。反硝化速率不能很好地由沉积物盐度预测，而是由其有机碳预测，表明异养反硝化作用。反硝化作用是该湿地 N 损失的主要途径，如果考虑到普通芦苇（1.0 m）目前的根深度，该湿地的氮去除能力估计为 337 kg N day（每日 N 负荷的 9.9%）。我们表明，随着盐度的增加，沉积物的 N 去除会减少，而对于异养反硝化作用，随着有机碳的增加，N 去除会增加。
