Determining nitrogen fate by hydrological pathways and impact on carbonate weathering in an agricultural karst watershed
文献类型：期刊论文
| 作者 | Hao, Zhuo; Gao, Yang2; Yang, Yang1; Zhang, Qingwen |
| 刊名 | INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH
 |
| 出版日期 | 2023-06-01 |
| 卷号 | 11期号:2页码:327-338 |
| ISSN号 | 2095-6339 |
| 关键词 | Karst Agricultural watershed Hydrological pathway Nitrogen Carbonate weathering |
| DOI | 10.1016/j.iswcr.2022.04.002 |
| 文献子类 | Article |
| 英文摘要 | Identifying the nitrogen (N) fate is complicated and a great challenge in karst watersheds because of the co-existence of natural pools and anthropogenic sources. The objective of the study was to use stable isotopic composition of dual-isotope (315NNitrate and 318ONitrate) and LOADEST model approaches to trace N sources, pathways in karst watershed. The study was conducted in the Houzhai watershed, which is a typical agricultural karst watershed from July 2016 to August 2018, to reveal the N fate and the coupled carbon(C)-N processes occurring in the riverine-watershed with agricultural activities. We found that the wet deposition of total nitrogen (TN) flux was 33.50 kg hm (-2).a(-1) and dissolved nitrogen (DN) flux was 21.66 kg hm (-2).a(-1). The DN runoff loss was 2.10 x 10(5) kg.a(-1) and the loss of DN during the wet season accounted for 95.4% over a year. In the wet season, NO3--N daily efflux was 977.62 +/- 516.66 kg ha(-1).day(-1)and 248.77 +/- 57.83 kg ha(-1).day(-1) in the dry season. The NH4 thorn -N efflux was 29.17 +/- 10.50 kg ha-1.day-1 and 4.42 +/- 3.07 kg ha(-1).day(-1) in the wet and dry seasons, respectively. The main form output load of N was NO3--N which was more than 30 times as much as NH4 thorn -N output loss. The NO3--N caused by rainfall contributed 11.82%-53.61% to the export load. Nitrate from soil contributed over 94% of the N to Houzhai river caused by N leaching. In addition, manure and farmland soil were the main sources of groundwater in the Houzhai watersheds, the contribution rates were 25.9% and 22.5%. The chemical N fertilizers affected carbonate weathering strongly, and the HCO3- flux caused by nitrifi-cation due to N fertilizers application in soil accounted for 23.5% of the entire watershed. This study suggested that carbonate weathering may be influenced by nitrogen nitrification in the karst watershed.(c) 2022 International Research and Training Center on Erosion and Sedimentation, China Water and Power Press, and China Institute of Water Resources and Hydropower Research. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| WOS关键词 | GROSS PRIMARY PRODUCTIVITY ; SHALLOW GROUNDWATER ; NITRATE CONTAMINATION ; GUIZHOU PROVINCE ; INLAND WATER ; DEPOSITION ; RIVER ; DENITRIFICATION ; ISOTOPES ; AREAS |
| WOS研究方向 | Environmental Sciences & Ecology ; Agriculture ; Water Resources |
| 出版者 | KEAI PUBLISHING LTD |
| WOS记录号 | WOS:000958192900001 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/190442]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.CAAS, Inst Environm & Sustainable Dev Agr, Agr Clean Watershed Res Grp, Beijing 100081, Peoples R China 3.Univ Calif Merced, Sierra Nevada Res Inst, Merced, CA 95344 USA |
| 推荐引用方式 GB/T 7714 | Hao, Zhuo,Gao, Yang,Yang, Yang,et al. Determining nitrogen fate by hydrological pathways and impact on carbonate weathering in an agricultural karst watershed[J]. INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH,2023,11(2):327-338. |
| APA | Hao, Zhuo,Gao, Yang,Yang, Yang,&Zhang, Qingwen.(2023).Determining nitrogen fate by hydrological pathways and impact on carbonate weathering in an agricultural karst watershed.INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH,11(2),327-338. |
| MLA | Hao, Zhuo,et al."Determining nitrogen fate by hydrological pathways and impact on carbonate weathering in an agricultural karst watershed".INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH 11.2(2023):327-338. |
入库方式： OAI收割
来源：地理科学与资源研究所
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