Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jhydrol.2024.131595 |
Contrasting responses of water use efficiency to increasing aridity in alpine shrubs: A modelling perspective | |
Su, Menglin; Yan, Ke; Wang, Xiangfu; Jin, Jiaxin; Li, Yuanhui; Dong, Wenting; Li, Haikui; Lu, Jun; Zhao, Chuanchuan; Wang, Weifeng | |
通讯作者 | Wang, WF |
来源期刊 | JOURNAL OF HYDROLOGY
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ISSN | 0022-1694 |
EISSN | 1879-2707 |
出版年 | 2024 |
卷号 | 639 |
英文摘要 | Water use efficiency (WUE), which is strongly related to carbon and water cycles, is crucial for maintaining fragile and sensitive alpine ecosystems. An accurate assessment of the spatial and temporal variations in WUE among alpine shrubs under different aridity levels is essential for quantifying the carbon and water balance in alpine environments. We calibrated the Biome-BGC model using the parameter estimation (PEST) approach with one year of data from an eddy covariance tower and validated the model against three years of carbon-water flux and carbon storage data from 80 biomass sampling sites in Qinghai Province, China. We then simulated the carbon and water cycles of alpine shrubs in Qinghai Province from 1980 to 2019. Using meteorological data from the study area, we analyzed the spatiotemporal variations and factors influencing WUE in regions with different aridity levels. The results showed that after optimization using the PEST approach, the mean absolute error (MAE) and root mean square error (RMSE) of gross primary productivity (GPP) decreased by 0.58 and 1.05 g C m- 2 d-1, respectively, and those of evapotranspiration (ET) decreased by 0.41 and 0.77 mm d-1, respectively. Spatial distribution analysis revealed that the annual mean GPP and ET generally decreased from southeast to northwest in the order of humid, subhumid, semi-arid, arid, and hyper-arid climate regions. In other regions, WUE exhibited a biphasic trend with the aridity index, decreasing under severe dryness but increasing as aridity increased. The primary controlling factor in humid and sub-humid regions is the mean annual temperature, whereas in arid and semi-arid regions it is the mean annual precipitation. These findings are critical for improving the prediction of carbon sequestration and water-holding capacity of alpine shrublands under drought conditions. |
英文关键词 | Meteorological factors Carbon -water coupling Process-based model Aridity index Alpine shrublands Water use efficiency |
类型 | Article |
语种 | 英语 |
收录类别 | SCI-E |
WOS记录号 | WOS:001267791900001 |
WOS关键词 | TERRESTRIAL ECOSYSTEMS ; TIBETAN PLATEAU ; EVAPOTRANSPIRATION ; CARBON ; DROUGHT ; CLIMATE ; TEMPERATURE ; ENVIRONMENT ; FLUXES ; MODIS |
WOS类目 | Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources |
WOS研究方向 | Engineering ; Geology ; Water Resources |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/404597 |
推荐引用方式 GB/T 7714 | Su, Menglin,Yan, Ke,Wang, Xiangfu,et al. Contrasting responses of water use efficiency to increasing aridity in alpine shrubs: A modelling perspective[J],2024,639. |
APA | Su, Menglin.,Yan, Ke.,Wang, Xiangfu.,Jin, Jiaxin.,Li, Yuanhui.,...&Wang, Weifeng.(2024).Contrasting responses of water use efficiency to increasing aridity in alpine shrubs: A modelling perspective.JOURNAL OF HYDROLOGY,639. |
MLA | Su, Menglin,et al."Contrasting responses of water use efficiency to increasing aridity in alpine shrubs: A modelling perspective".JOURNAL OF HYDROLOGY 639(2024). |
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