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| DOI | 10.1016/j.agrformet.2019.06.003 |
| Water and carbon dioxide exchange of an alpine meadow ecosystem in the northeastern Tibetan Plateau is energy-limited | |
| Sun S.; Che T.; Li H.; Wang T.; Ma C.; Liu B.; Wu Y.; Song Z. | |
| 发表日期 | 2019 |
| ISSN | 01681924 |
| 卷号 | 275 |
| 英文摘要 | The alpine meadow in the Tibetan Plateau (TP) is a fragile ecosystem and very sensitive to climate change and human activities. However, the flux (energy, water, and carbon dioxide) exchanges (FEs) and their controls in this ecosystem are not well understood. Using two years (2015–2016) of observations from three eddy covariance towers and different grazing management types, we quantified the FEs of an alpine meadow ecosystem in the northeastern TP. A boosted regression trees (BRT)-based method was used to determine the environmental controls of FEs and clarify the factors causing the differences in FEs among the sites. The mean annual latent heat flux (LE), sensible heat flux (H), and evapotranspiration (ET) of the sites were 36.3 W m−2, 23.2 W m−2, and 458.2 mm, respectively. The mean annual gross primary productivity (GPP) and ecosystem respiration (Re) of the sites were 504.8 and 317.2 g C m−2, respectively. The mean annual net ecosystem CO2 exchange (NEE) of the sites was –187.6 g C m–2, indicating that the ecosystem was a CO2 sink, not accounting for grazing losses. The BRT-based analysis showed that, (i) The LE (ET) and H were mostly determined by soil temperature (ST) and downward shortwave radiation (DR), while the NEE, GPP, and Re were primarily correlated with ST. As a result, the FEs of the ecosystem were energy-limited; (ii) The high spatial heterogeneity in multiple environmental variables jointly determined the differences in FEs of the ecosystem. The differences in LE (ET) and H among the sites resulted from multiple environmental variables, including DR, ST, precipitation, and SM; and differences in NEE, GPP, and Re were mainly caused by precipitation, SM, and RH. The study highlights that future warming will enhance GPP and Re of the ecosystem, while reducing the CO2 sink because of the larger increases in Re than in GPP. © 2019 Elsevier B.V. |
| 英文关键词 | Alpine meadow ecosystem; Ecosystem respiration; Eddy covariance; Evapotranspiration (ET); Gross primary productivity (GPP); Net ecosystem CO2 exchange (NEE) |
| URL | https://www2.scopus.com/inward/record.uri?eid=2-s2.0-85066750696&doi=10.1016%2fj.agrformet.2019.06.003&partnerID=40&md5=978ce767f827dd7e52bab7ee0f39c668 |
| 语种 | 英语 |
| scopus关键词 | alpine environment; carbon flux; climate change; ecosystem dynamics; eddy covariance; evapotranspiration; human activity; meadow; net ecosystem exchange; primary production; water flux; China; Qinghai-Xizang Plateau |
| 来源期刊 | Agricultural and Forest Meteorology
 |
| 来源机构 | 中国科学院西北生态环境资源研究院 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/77201 |
| 推荐引用方式 GB/T 7714 | Sun S.； Che T.； Li H.； Wang T.； Ma C.； Liu B.； Wu Y.； Song Z.. Water and carbon dioxide exchange of an alpine meadow ecosystem in the northeastern Tibetan Plateau is energy-limited[J]. 中国科学院西北生态环境资源研究院,2019,275. |
| APA | Sun S.； Che T.； Li H.； Wang T.； Ma C.； Liu B.； Wu Y.； Song Z..(2019).Water and carbon dioxide exchange of an alpine meadow ecosystem in the northeastern Tibetan Plateau is energy-limited.Agricultural and Forest Meteorology,275. |
| MLA | Sun S.； Che T.； Li H.； Wang T.； Ma C.； Liu B.； Wu Y.； Song Z.."Water and carbon dioxide exchange of an alpine meadow ecosystem in the northeastern Tibetan Plateau is energy-limited".Agricultural and Forest Meteorology 275(2019). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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