Spatial-temporal variations in riverine carbon strongly influenced by local hydrological events in an alpine catchment
文献类型：期刊论文
| 作者 | Wang, Xin2; Liu, Ting; Wang, Liang; Liu, Zongguang2; Zhu, Erxiong2; Wang, Simin2; Cai, Yue2; Zhu, Shanshan2; Feng, Xiaojuan2
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| 刊名 | BIOGEOSCIENCES
 |
| 出版日期 | 2021 |
| 卷号 | 18期号:10页码:3015-3028 |
| ISSN号 | 1726-4170 |
| DOI | 10.5194/bg-18-3015-2021 |
| 文献子类 | Article |
| 英文摘要 | Headwater streams drain >70 % of global land areas but are poorly monitored compared with large rivers. The small size and low water buffering capacity of headwater streams may result in a high sensitivity to local hydrological alterations and different carbon transport patterns from large rivers. Furthermore, alpine headwater streams on the Asian water tower, i.e., Qinghai-Tibetan Plateau, are heavily affected by thawing of frozen soils in spring as well as monsoonal precipitation in summer, which may present contrasting spatial-temporal variations in carbon transport compared to tropical and temperate streams and strongly influence the export of carbon locked in seasonally frozen soils. To illustrate the unique hydro-biogeochemistry of riverine carbon in Qinghai-Tibetan headwater streams, here we carry out a benchmark investigation on the riverine carbon transport in the Shaliu River (a small alpine river integrating headwater streams) based on annual flux monitoring, sampling at a high spatial resolution in two different seasons and hydrological event monitoring. We show that riverine carbon fluxes in the Shaliu River were dominated by dissolved inorganic carbon, peaking in the summer due to high discharge brought by the monsoon. Combining seasonal sampling along the river and monitoring of soil-river carbon transfer during spring thaw, we also show that both dissolved and particulate forms of riverine carbon increased downstream in the pre-monsoon season due to increasing contribution of organic matter derived from thawed soils along the river. By comparison, riverine carbon fluctuated in the summer, likely associated with sporadic inputs of organic matter supplied by local precipitation events during the monsoon season. Furthermore, using lignin phenol analysis for both riverine organic matter and soils in the basin, we show that the higher acid-to-aldehyde (Ad/Al) ratios of riverine lignin in the monsoon season reflect a larger contribution of topsoil likely via increased surface runoff compared with the pre-monsoon season when soil leachate lignin Ad/Al ratios were closer to those in the subsoil than topsoil solutions. Overall, these findings highlight the unique patterns and strong links of carbon transport in alpine headwater catchments with local hydrological events. Given the projected climate warming on the Qinghai-Tibetan Plateau, thawing of frozen soils and alterations of precipitation regimes may significantly influence the alpine headwater carbon transport, with critical effects on the biogeochemical cycles of the downstream rivers. The alpine headwater catchments may also be utilized as sentinels for climate-induced changes in the hydrological pathways and/or biogeochemistry of the small basin. |
| 学科主题 | Ecology ; Geosciences, Multidisciplinary |
| 出版地 | GOTTINGEN |
| 电子版国际标准刊号 | 1726-4189 |
| WOS关键词 | DISSOLVED ORGANIC-MATTER ; LIGNIN |
| WOS研究方向 | Science Citation Index Expanded (SCI-EXPANDED) |
| 语种 | 英语 |
| WOS记录号 | WOS:000654907700001 |
| 出版者 | COPERNICUS GESELLSCHAFT MBH |
| 资助机构 | National Basic Research Program of China [2019YFA0607303] ; National Natural Science Foundation of China [42025303, 41973075, 31988102] |
| 源URL | [http://ir.ibcas.ac.cn/handle/2S10CLM1/26419]  |
| 专题 | 植被与环境变化国家重点实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Xin,Liu, Ting,Wang, Liang,et al. Spatial-temporal variations in riverine carbon strongly influenced by local hydrological events in an alpine catchment[J]. BIOGEOSCIENCES,2021,18(10):3015-3028. |
| APA | Wang, Xin.,Liu, Ting.,Wang, Liang.,Liu, Zongguang.,Zhu, Erxiong.,...&Feng, Xiaojuan.(2021).Spatial-temporal variations in riverine carbon strongly influenced by local hydrological events in an alpine catchment.BIOGEOSCIENCES,18(10),3015-3028. |
| MLA | Wang, Xin,et al."Spatial-temporal variations in riverine carbon strongly influenced by local hydrological events in an alpine catchment".BIOGEOSCIENCES 18.10(2021):3015-3028. |
入库方式： OAI收割
来源：植物研究所
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