Integrating Aquatic and Terrestrial Carbon Fluxes to Assess the Net Landscape Carbon Balance of a Highly Erodible Semiarid Catchment
文献类型：期刊论文
| 作者 | Ran, Lishan1; Wang, Xuhui2; Li, Siliang3; Zhou, Yuanyuan4; Xu, Yi-Jun5; Chun Ngai Chan1; Fang, Nufang6; Xin, Zhongbao7; Shen, Hongxun8 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
 |
| 出版日期 | 2022-03-01 |
| 卷号 | 127期号:3页码:15 |
| 关键词 | landscape carbon balance terrestrial ecosystem productivity fluvial carbon export greenhouse gas emissions semiarid catchments |
| ISSN号 | 2169-8953 |
| DOI | 10.1029/2021JG006765 |
| 通讯作者 | Ran, Lishan(lsran@hku.hk) |
| 英文摘要 | The magnitude of the carbon (C) sink due to terrestrial primary production may be overestimated if the C losses through fluvial networks are not properly accounted for. In this study, we hypothesize that terrestrial-aquatic C transfers represent a major loss of the terrestrial C sink in semiarid catchments. To test the hypothesis, we assessed the net landscape carbon balance (NLCB) of a highly erodible catchment on the semiarid Chinese Loess Plateau by compiling terrestrial net ecosystem productivity (NEP) estimates and aquatic fluxes of downstream C export, emission of CO2 and CH4, and C burial. Our results showed that, despite the severe erosion and strong C mobilization, this catchment was a net C sink (NLCB = 48.3-54.8 Mg C km(-2) year(-1)). Downstream C export at catchment outlet and evasion of CO2 and CH4 only offset terrestrial NEP by 7.7%-8.5% due largely to low flow discharge and small water surface area of the stream network. Furthermore, C burial in reservoirs played a considerable role, reducing an additional 7.5%-8.3% of the NEP. Altogether, approximately 84% of the net terrestrial C production was stored within the catchment. Our study reveals that semiarid catchments with widespread erosion and low terrestrial production remain a net C sink, although the magnitude is lower than those found in other climate zones. Our study further advocates the need to integrate terrestrial-aquatic C transfer into a comprehensive net C balance accounting at the landscape scale. Ignoring the aquatic C loss will cause biased estimates of the overall C sink strength. |
| WOS关键词 | ORGANIC-CARBON ; SOIL-EROSION ; RIVER ; CO2 ; VARIABILITY ; EMISSIONS ; LAND ; RESERVOIRS ; NITROGEN ; DIOXIDE |
| 资助项目 | Research Grants Council of Hong Kong[17300619] ; Research Grants Council of Hong Kong[17300621] ; Natural Science Foundation of China[42171096] ; U.S. Department of Agriculture Hatch Fund project[LAB94459] |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000777487700015 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | Research Grants Council of Hong Kong ; Natural Science Foundation of China ; U.S. Department of Agriculture Hatch Fund project |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/174184]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Ran, Lishan |
| 作者单位 | 1.Univ Hong Kong, Dept Geog, Pokfulam, Hong Kong, Peoples R China 2.Peking Univ, Coll Urban & Environm Sci, Sino French Inst Earth Syst Sci, Beijing, Peoples R China 3.Tianjin Univ, Sch Earth Syst Sci, Inst Surface Earth Syst Sci, Tianjin, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China 5.Louisiana State Univ, Sch Renewable Nat Resources, Ctr Agr, Baton Rouge, LA 70803 USA 6.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling, Shaanxi, Peoples R China 7.Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing, Peoples R China 8.Shaanxi Hydrol & Water Resource Survey, Jingcun Gauge, Binxian, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ran, Lishan,Wang, Xuhui,Li, Siliang,et al. Integrating Aquatic and Terrestrial Carbon Fluxes to Assess the Net Landscape Carbon Balance of a Highly Erodible Semiarid Catchment[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2022,127(3):15. |
| APA | Ran, Lishan.,Wang, Xuhui.,Li, Siliang.,Zhou, Yuanyuan.,Xu, Yi-Jun.,...&Shen, Hongxun.(2022).Integrating Aquatic and Terrestrial Carbon Fluxes to Assess the Net Landscape Carbon Balance of a Highly Erodible Semiarid Catchment.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,127(3),15. |
| MLA | Ran, Lishan,et al."Integrating Aquatic and Terrestrial Carbon Fluxes to Assess the Net Landscape Carbon Balance of a Highly Erodible Semiarid Catchment".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 127.3(2022):15. |
入库方式： OAI收割
来源：地理科学与资源研究所
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