کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8871517 | 1622707 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nitrogen removal through N cycling from sediments in a constructed coastal marsh as assessed by 15N-isotope dilution
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
اقیانوس شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Nitrogen removal through N cycling from sediments in a constructed coastal marsh as assessed by 15N-isotope dilution Nitrogen removal through N cycling from sediments in a constructed coastal marsh as assessed by 15N-isotope dilution](/preview/png/8871517.png)
چکیده انگلیسی
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-15NH4+ using sediments collected from five sub-marshes in Shihwa marsh, Korea. Time-course patterns of concentrations and 15N-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 337â¯kgâ¯Nâ¯dayâ1 (9.9% of the daily N-loadings) considering the current rooting depth of common reeds (1.0â¯m). We showed that sediment N removal decreases with increasing salinity and can increase with increasing organic-C for heterotrophic denitrification.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Pollution Bulletin - Volume 129, Issue 1, April 2018, Pages 275-283
Journal: Marine Pollution Bulletin - Volume 129, Issue 1, April 2018, Pages 275-283
نویسندگان
Hee-Myong Ro, Pan-Gun Kim, Ji-Suk Park, Seok-In Yun, Junho Han,