Dynamic biogeochemical controls on river pCO(2) and recent changes under aggravating river impoundment: An example of the subtropical Yangtze River
文献类型：期刊论文
| 作者 | Liu, Shaoda; Lu, Xi Xi2; Xia, Xinghui3; Zhang, Shurong1; Ran, Lishan; Yang, Xiankun; Liu, Ting5 |
| 刊名 | GLOBAL BIOGEOCHEMICAL CYCLES
 |
| 出版日期 | 2016 |
| 卷号 | 30期号:6页码:880-897 |
| ISSN号 | 0886-6236 |
| 关键词 | river organic carbon pCO(2) reservoir autotrophy river |
| DOI | 10.1002/2016GB005388 |
| 文献子类 | Article |
| 英文摘要 | This paper highlights two aspects of the dynamic biogeochemical controls of riverine pCO(2) in an increasingly impounded large subtropical river (the Yangtze): the terrestrial dominance through internal respiration of land-derived organic carbon and the influence of increased autotrophic activity in impounded areas on river pCO(2). River pCO(2) and total organic carbon (TOC) increase downstream on the main stem (pCO(2): 528-1703 mu atm; TOC: 137-263 mu mol/L) and vary significantly among tributaries (464-3300 mu atm; TOC: 109-340 mu mol/L). pCO(2) displays larger spatial variability than temporal variability and is spatially correlated with river organic carbon across the river (p<0.05-0.0001, seasonally independent). pCO(2) is also negatively correlated with dissolved oxygen (r(2)=0.46, p<0.0001). Respiration of allochthonous organic carbon in water column is concluded as an essential source of CO2 supersaturation and river heterotrophy. However, significant benthic respiration and/or direct soil CO2 transport (e.g., via groundwater, similar to 80%) exist at the same time. The temporal and spatial distribution of POC compositional characteristics and chlorophyll a indicate the dominant control of terrestrial processes (e.g., organic matter transport and soil erosion) on the river pCO(2) biogeochemistry, especially in warm seasons. Increased autotrophy and significant pCO(2) decrease (>60%) do occur in impounded areas (especially in nutrient-rich rivers), but the decrease is mostly temporal and regional (similar to 8% of the data points are significantly influenced, all from the upper reach and/or major tributaries). The paper concludes that terrestrial influence still dominates the pCO(2) biogeochemistry in this increasingly intercepted and regulated river system. |
| 学科主题 | Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences |
| 电子版国际标准刊号 | 1944-9224 |
| 出版地 | WASHINGTON |
| WOS关键词 | CO2 PARTIAL-PRESSURE ; CARBON-DIOXIDE ; ORGANIC-MATTER ; EMISSIONS ; LAKES ; RESERVOIRS ; STREAMS ; BASIN ; FLUX ; SUPERSATURATION |
| WOS研究方向 | Science Citation Index Expanded (SCI-EXPANDED) |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000379949500005 |
| 资助机构 | National University of Singapore (Humanity and Social Sciences) [R-109-000-172-646, R-109-000-191-646] ; National Natural Science Foundation of China (National Science Foundation for Distinguished Young Scholars) [51325902] |
| 源URL | [http://ir.ibcas.ac.cn/handle/2S10CLM1/25175]  |
| 专题 | 植被与环境变化国家重点实验室 |
| 作者单位 | 1.Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing, Peoples R China 2.Natl Univ Singapore, Dept Geog, Kent Ridge, Singapore, Singapore 3.Inner Mongolia Univ, Coll Environm & Resources, Hohhot, Peoples R China 4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 5.Beijing Normal Univ, Coll Water Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Shaoda,Lu, Xi Xi,Xia, Xinghui,et al. Dynamic biogeochemical controls on river pCO(2) and recent changes under aggravating river impoundment: An example of the subtropical Yangtze River[J]. GLOBAL BIOGEOCHEMICAL CYCLES,2016,30(6):880-897. |
| APA | Liu, Shaoda.,Lu, Xi Xi.,Xia, Xinghui.,Zhang, Shurong.,Ran, Lishan.,...&Liu, Ting.(2016).Dynamic biogeochemical controls on river pCO(2) and recent changes under aggravating river impoundment: An example of the subtropical Yangtze River.GLOBAL BIOGEOCHEMICAL CYCLES,30(6),880-897. |
| MLA | Liu, Shaoda,et al."Dynamic biogeochemical controls on river pCO(2) and recent changes under aggravating river impoundment: An example of the subtropical Yangtze River".GLOBAL BIOGEOCHEMICAL CYCLES 30.6(2016):880-897. |
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来源：植物研究所
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