Effects of macrophytes and environmental factors on sediment denitrification in a subtropical reservoir
文献类型：期刊论文
| 作者 | Bu, Hongmei2; Fry, Brian1; Burford, Michele A.1 |
| 刊名 | ENVIRONMENTAL POLLUTION
 |
| 出版日期 | 2022-06-15 |
| 卷号 | 303页码:9 |
| 关键词 | Denitrification rate Seasonal variations Environmental factors Macrophyte beds N-15 isotope pairing technique |
| ISSN号 | 0269-7491 |
| DOI | 10.1016/j.envpol.2022.119118 |
| 通讯作者 | Bu, Hongmei(buhm@igsnrr.ac.cn) |
| 英文摘要 | Sediment denitrification plays an important role in nitrogen removal in aquatic systems. However, the importance in nitrogen removal in reservoirs, with a focus on seasonal differences of conditions such as macrophyte beds and environmental factors, is less well understood. This study examined sediment denitrification rate (D-n), and their potential controlling factors were determined in both macrophyte beds and deeper waters in the subtropical reservoir. The mean D-n in the reservoir annually was 18.0 +/- 6.3 (mean +/- S.E.) mmol N m(-2) d(-1), with significant seasonal variation (p < 0.01), i.e. 43.2 +/- 12.8, 6.7 +/- 6.3, and 4.0 +/- 2.2 mmol N m(-2) d(-1) in winter, spring and summer respectively. There were no statistical differences in D-n between shallow waters with macrophyte beds and deeper waters without macrophyte beds, although macrophyte beds had higher denitrification rates in summer. The D-n rates were significantly correlated with temperature, conductivity, dissolved oxygen, pH, nitrate-nitrogen concentration (NO3--N) (p < 0.01) and turbidity (p < 0.05). Linear regression models demonstrated environmental variables explained between 36% and 76% of the variation in D-n. The correlation with NO3--N concentrations suggests that it may be a limited factor for D-n. Annual nitrogen removal of the reservoir by a combination of sediment and water denitrification was totally estimated to be 370 t N with an annual removal efficiency of approximately 11%. Nitrogen removal was much higher in winter than other seasons, with about 305 t N removed, accounting for 12% of the total nitrogen inputs. Therefore, denitrification appears to play a minor role throughout much of the year, but in winter months when nitrate accumulates, it may play a more major role. |
| WOS关键词 | ISOTOPE PAIRING TECHNIQUE ; POTENTIAL DENITRIFICATION ; NITROGEN ; WETLANDS ; REMOVAL ; NUTRIENTS ; CARBON ; LAKES |
| 资助项目 | Beijing Natural Science Foundation[8172044] ; China Scholarship Council[201404910228] ; Australian Rivers Institute |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000782596200004 |
| 出版者 | ELSEVIER SCI LTD |
| 资助机构 | Beijing Natural Science Foundation ; China Scholarship Council ; Australian Rivers Institute |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/174935]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Bu, Hongmei |
| 作者单位 | 1.Griffith Univ, Australian Rivers Inst, Sch Environm & Sci, Nathan, Qld 4111, Australia 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bu, Hongmei,Fry, Brian,Burford, Michele A.. Effects of macrophytes and environmental factors on sediment denitrification in a subtropical reservoir[J]. ENVIRONMENTAL POLLUTION,2022,303:9. |
| APA | Bu, Hongmei,Fry, Brian,&Burford, Michele A..(2022).Effects of macrophytes and environmental factors on sediment denitrification in a subtropical reservoir.ENVIRONMENTAL POLLUTION,303,9. |
| MLA | Bu, Hongmei,et al."Effects of macrophytes and environmental factors on sediment denitrification in a subtropical reservoir".ENVIRONMENTAL POLLUTION 303(2022):9. |
入库方式： OAI收割
来源：地理科学与资源研究所
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