| 论文题目： | How Carbon Footprint Responds to Water Circulation Rates and Availability at Different Timescales in a Subtropical Forest Ecosystem |
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| 第一作者： | Lu Yao; Gao Yang; Sun Kun; Lyu Sidan; Wen Xuefa etc. |
| 联系作者： | |
| 发表年度： | 2021 |
| 摘 要： | In the subtropics, the influence of water on the net ecosystem carbon exchange (NEE) is critical, subsequently determining net primary productivity (NPP). Water also contributes the majority of interannual variability in atmospheric carbon dioxide (CO2) concentrations in the subtropics and helps to mitigate climate change. Using the technology of vorticity correlation, this study continuously monitored NEE, ecosystem respiration (RE), and the gross ecosystem exchange (GEE) of a small subtropical watershed in the middle and lower reaches of the Yangtze River from 2014 to 2017. Water parameters were concurrently monitored, such as rainfall (RF), runoff (RO), evapotranspiration (ET), vapor-pressure deficit (VPD), and soil water content (SWC). Results showed that an increase in the water circulation rate and water availability will promote an increase in GEE, RE, and NEE on both hourly and daily timescales, but will inhibit these carbon (C) exchanges on an annual timescale. For years that experience low annual rainfall but increased continuous rainfall, a decrease in ET may inhibit plant respiration, thus enabling subtropical forest ecosystems to fix more C. Additionally, more intense and irregular rainfall patterns caused by climate change may weaken the overall C sequestration capacity of subtropical forest ecosystems. Results from this study are intended to help us better understand coupled C and water cycling mechanisms within terrestrial ecosystems, while also providing a reference to assess the impact of climate change on ecosystem C cycling processes. |
| 英文摘要： | In the subtropics, the influence of water on the net ecosystem carbon exchange (NEE) is critical, subsequently determining net primary productivity (NPP). Water also contributes the majority of interannual variability in atmospheric carbon dioxide (CO2) concentrations in the subtropics and helps to mitigate climate change. Using the technology of vorticity correlation, this study continuously monitored NEE, ecosystem respiration (RE), and the gross ecosystem exchange (GEE) of a small subtropical watershed in the middle and lower reaches of the Yangtze River from 2014 to 2017. Water parameters were concurrently monitored, such as rainfall (RF), runoff (RO), evapotranspiration (ET), vapor-pressure deficit (VPD), and soil water content (SWC). Results showed that an increase in the water circulation rate and water availability will promote an increase in GEE, RE, and NEE on both hourly and daily timescales, but will inhibit these carbon (C) exchanges on an annual timescale. For years that experience low annual rainfall but increased continuous rainfall, a decrease in ET may inhibit plant respiration, thus enabling subtropical forest ecosystems to fix more C. Additionally, more intense and irregular rainfall patterns caused by climate change may weaken the overall C sequestration capacity of subtropical forest ecosystems. Results from this study are intended to help us better understand coupled C and water cycling mechanisms within terrestrial ecosystems, while also providing a reference to assess the impact of climate change on ecosystem C cycling processes. |
| 刊物名称： | ACS EARTH AND SPACE CHEMISTRY |
| 全文链接： | |
| 论文类别： | SCI |
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