Evapotranspiration and Its Partitioning in Alpine Meadow of Three-River Source Region on the Qinghai-Tibetan Plateau
The Qinghai-Tibetan Plateau (QTP) is generally considered to be the water source region for its surrounding lowlands. However, there have only been a few studies that have focused on quantifying alpine meadow evapotranspiration (<i>ET</i>) and its partitioning, which are important compon...
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MDPI AG
2021-07-01
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| author | Lifeng Zhang Zhiguang Chen Xiang Zhang Liang Zhao Qi Li Dongdong Chen Yanhong Tang Song Gu |
| author_facet | Lifeng Zhang Zhiguang Chen Xiang Zhang Liang Zhao Qi Li Dongdong Chen Yanhong Tang Song Gu |
| author_sort | Lifeng Zhang |
| collection | DOAJ |
| description | The Qinghai-Tibetan Plateau (QTP) is generally considered to be the water source region for its surrounding lowlands. However, there have only been a few studies that have focused on quantifying alpine meadow evapotranspiration (<i>ET</i>) and its partitioning, which are important components of water balance. This paper used the Shuttleworth–Wallace (S–W) model to quantify soil evaporation (<i>E</i>) and plant transpiration (<i>T</i>) in a degraded alpine meadow (34°24′ N, 100°24′ E, 3963 m a.s.l) located at the QTP from September 2006 to December 2008. The results showed that the annual <i>ET</i> estimated by the S–W model (<i>ET<sub>SW</sub></i>) was 511.5 mm (2007) and 499.8 mm (2008), while <i>E</i> estimated by the model (<i>E<sub>SW</sub></i>) was 306.0 mm and 281.7 mm for 2007 and 2008, respectively, which was 49% and 29% higher than plant transpiration (<i>T<sub>SW</sub></i>). Model analysis showed that <i>ET</i>, <i>E</i>, and <i>T</i> were mainly dominated by net radiation (<i>R<sub>n</sub></i>), while leaf area index (<i>LAI</i>) and soil water content at a 5 cm depth (<i>SWC<sub>5cm</sub></i>) were the most important factors influencing <i>ET</i> partitioning. The study results suggest that meadow degradation may increase water loss through increasing <i>E</i>, and reduce the water conservation capability of the alpine meadow ecosystem. |
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| spelling | doaj.art-c135075ec5334ffb9a6a744fa467974a2023-11-22T06:19:49ZengMDPI AGWater2073-44412021-07-011315206110.3390/w13152061Evapotranspiration and Its Partitioning in Alpine Meadow of Three-River Source Region on the Qinghai-Tibetan PlateauLifeng Zhang0Zhiguang Chen1Xiang Zhang2Liang Zhao3Qi Li4Dongdong Chen5Yanhong Tang6Song Gu7College of Life Sciences, NanKai University, 94 Weijin Road, Tianjin 300071, ChinaCollege of Life Sciences, NanKai University, 94 Weijin Road, Tianjin 300071, ChinaInstitute of Life Sciences and Technology, Central South University of Forestry and Technology, 498 Shaoshannan Road, Changsha 410004, ChinaNorthwest Institute of Plateau Biology, Chinese Academy of Sciences, 23 Xinning Road, Xining 810008, ChinaNorthwest Institute of Plateau Biology, Chinese Academy of Sciences, 23 Xinning Road, Xining 810008, ChinaNorthwest Institute of Plateau Biology, Chinese Academy of Sciences, 23 Xinning Road, Xining 810008, ChinaCollege of Urban and Environmental Sciences, Peking University, 5 Yiheyuan Road, Beijing 100781, ChinaCollege of Life Sciences, NanKai University, 94 Weijin Road, Tianjin 300071, ChinaThe Qinghai-Tibetan Plateau (QTP) is generally considered to be the water source region for its surrounding lowlands. However, there have only been a few studies that have focused on quantifying alpine meadow evapotranspiration (<i>ET</i>) and its partitioning, which are important components of water balance. This paper used the Shuttleworth–Wallace (S–W) model to quantify soil evaporation (<i>E</i>) and plant transpiration (<i>T</i>) in a degraded alpine meadow (34°24′ N, 100°24′ E, 3963 m a.s.l) located at the QTP from September 2006 to December 2008. The results showed that the annual <i>ET</i> estimated by the S–W model (<i>ET<sub>SW</sub></i>) was 511.5 mm (2007) and 499.8 mm (2008), while <i>E</i> estimated by the model (<i>E<sub>SW</sub></i>) was 306.0 mm and 281.7 mm for 2007 and 2008, respectively, which was 49% and 29% higher than plant transpiration (<i>T<sub>SW</sub></i>). Model analysis showed that <i>ET</i>, <i>E</i>, and <i>T</i> were mainly dominated by net radiation (<i>R<sub>n</sub></i>), while leaf area index (<i>LAI</i>) and soil water content at a 5 cm depth (<i>SWC<sub>5cm</sub></i>) were the most important factors influencing <i>ET</i> partitioning. The study results suggest that meadow degradation may increase water loss through increasing <i>E</i>, and reduce the water conservation capability of the alpine meadow ecosystem.https://www.mdpi.com/2073-4441/13/15/2061evapotranspiration partitioningsoil evaporationleaf area indexShuttleworth–Wallace modeleddy covariance |
| spellingShingle | Lifeng Zhang Zhiguang Chen Xiang Zhang Liang Zhao Qi Li Dongdong Chen Yanhong Tang Song Gu Evapotranspiration and Its Partitioning in Alpine Meadow of Three-River Source Region on the Qinghai-Tibetan Plateau Water evapotranspiration partitioning soil evaporation leaf area index Shuttleworth–Wallace model eddy covariance |
| title | Evapotranspiration and Its Partitioning in Alpine Meadow of Three-River Source Region on the Qinghai-Tibetan Plateau |
| title_full | Evapotranspiration and Its Partitioning in Alpine Meadow of Three-River Source Region on the Qinghai-Tibetan Plateau |
| title_fullStr | Evapotranspiration and Its Partitioning in Alpine Meadow of Three-River Source Region on the Qinghai-Tibetan Plateau |
| title_full_unstemmed | Evapotranspiration and Its Partitioning in Alpine Meadow of Three-River Source Region on the Qinghai-Tibetan Plateau |
| title_short | Evapotranspiration and Its Partitioning in Alpine Meadow of Three-River Source Region on the Qinghai-Tibetan Plateau |
| title_sort | evapotranspiration and its partitioning in alpine meadow of three river source region on the qinghai tibetan plateau |
| topic | evapotranspiration partitioning soil evaporation leaf area index Shuttleworth–Wallace model eddy covariance |
| url | https://www.mdpi.com/2073-4441/13/15/2061 |
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