Academic Journal
Indirect N2O emissions with seasonal variations from an agricultural drainage ditch mainly receiving interflow water
| العنوان: | Indirect N2O emissions with seasonal variations from an agricultural drainage ditch mainly receiving interflow water |
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| المؤلفون: | Tian, Linlin, Akiyama, Hiroko, Zhu, Bo, Shen, Xi |
| بيانات النشر: | ELSEVIER SCI LTD |
| سنة النشر: | 2018 |
| المجموعة: | IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) / 中国科学院水利部成都山地灾害与环境研究所机构知识库 |
| مصطلحات موضوعية: | Nitrous oxide (N2O), Indirect NO emission factor (EF5g), Intensive precipitation, Nitrate, Leaching, Drainage ditch, NITROUS-OXIDE EMISSIONS, NITRATE-CONTAMINATED AQUIFERS, GREENHOUSE-GAS EMISSIONS, HEADWATER STREAMS, SICHUAN BASIN, DISSOLVED N2O, PURPLE SOIL, GROUNDWATER, DENITRIFICATION, CHINA, Environmental Sciences & Ecology, Environmental Sciences |
| الوصف: | Nitrogen (N)-enriched leaching water may act as a source of indirect N2O emission when it is discharged to agricultural drainage ditches. In this study, indirect N2O emissions from an agricultural drainage ditch mainly receiving interflow water were measured using the static chamber-gas chromatography technique during 2012-2015 in the central Sichuan Basin in southwestern China. We found the drainage ditch was a source of indirect N2O emissions contributing an inter-annual mean flux of 6.56 +/- 1.12 mu g N m(-2) h(-1) and a mean indirect N2O emission factor (EF5g) value of 0.03 +/- 0.003%. The mean EF5g value from literature review was 0.51%, which was higher than the default EF5g value (0.25%) proposed by the Intergovernmental Panel on Climate Change (IPCC) in 2006. Our study demonstrated that, more in situ observations of N2O emissions as regards N leaching are required, to account for the large variation in EF5g values and to improve the accuracy and confidence of the default EF5g value. Indirect N2O emissions varied with season, higher emissions occurred in summer and autumn. These seasonal variations were related to drainage water NO3--N concentration, temperature, and precipitation. Our results showed that intensive precipitation increased NO3--N concentrations and N2O emissions, and when combined with warmer water temperatures, these may have increased the denitrification rate that led to the higher summer and autumn N2O emissions in the studied agricultural drainage ditch. (C) 2018 Elsevier Ltd. All rights reserved. |
| نوع الوثيقة: | article in journal/newspaper report |
| اللغة: | English |
| Relation: | ENVIRONMENTAL POLLUTION; http://ir.imde.ac.cn/handle/131551/23988 |
| DOI: | 10.1016/j.envpol.2018.07.018 |
| الاتاحة: | http://ir.imde.ac.cn/handle/131551/23988 https://doi.org/10.1016/j.envpol.2018.07.018 |
| Rights: | cn.org.cspace.api.content.CopyrightPolicy@3bd1598 |
| رقم الانضمام: | edsbas.58596AEB |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.envpol.2018.07.018 |
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