The energy-limited water loss of an alpine shrubland on the northeastern Qinghai-Tibetan Plateau, China DOI Creative Commons
Fawei Zhang,

Hongqin Li,

Jingbin Zhu

et al.

Journal of Hydrology Regional Studies, Journal Year: 2024, Volume and Issue: 55, P. 101905 - 101905

Published: July 30, 2024

Alpine shrubland on the northeastern Qinghai-Tibetan Plateau. Water provision ability is a pivotal ecological service of high-altitude alpine regions and controlled by precipitation, evapotranspiration (ET), soil water storage whereas underlying ecohydrological processes remain highly unquantified. Here, we investigated continuous 19-year flux measurements to quantify temporal patterns ET budget (precipitation minus ET, P−ET), as well 0-20 cm change (ΔSWS). At monthly scale, peaked in July (96.7 ± 26.4 mm, Mean S.D.) averaged 41.7 31.9 whose variations were determined slope saturation vapor pressure curve at air temperature, temperatures, regardless vegetation growth stage. P−ET 18.3 26.3 mm August September while stayed deficit during other months. The precipitation May-October growing season non-growing from November April. ΔSWS May (28.8 11.2 mm) (3.0 2.7 almost accumulated zero over whole season. annual scales, none P−ET, changed significantly. 512.2 68.4 exceeded (459.1 58.4 mm), likely due lateral flow supply uphill locations. regulated directly bulk canopy resistance indirectly net radiation. −53.2 95.4 demonstrated clear (−51.6 21.0 driven jointly with opposite but equivalent effects. dominance thermal conditions energy availability variability manifested an energy-limited feature loss shrubland. elucidated that plays retention rather than function through transforming variable input into stable loss. Pathways analysis showed composite condition including its indirect positive effect atmospheric evaporative demand negative transfer resistance. observed (Heat, T , s △), (Demand, R n VPD), (Resistance, r ), moisture (Supply, Rain SWC) classified variables. Numbers neighboring measured variables are their coefficients thickness arrow ten times standardized coefficients. Red solid black dashed arrows (significance levels * P < 0.05, ** 0.01, *** 0.001). 2 represents proportion variance explained model. Abbreviations: : temperature; topsoil △: respect ; radiation; VPD: satur ted deficit; aerodynamic resistance; Rain: precipitation; SWC: 10 content. • Variations long-term eddy measurements. Thermal drove respectively. Monthly related catchment.

Language: Английский

The energy-limited water loss of an alpine shrubland on the northeastern Qinghai-Tibetan Plateau, China DOI Creative Commons
Fawei Zhang,

Hongqin Li,

Jingbin Zhu

et al.

Journal of Hydrology Regional Studies, Journal Year: 2024, Volume and Issue: 55, P. 101905 - 101905

Published: July 30, 2024

Alpine shrubland on the northeastern Qinghai-Tibetan Plateau. Water provision ability is a pivotal ecological service of high-altitude alpine regions and controlled by precipitation, evapotranspiration (ET), soil water storage whereas underlying ecohydrological processes remain highly unquantified. Here, we investigated continuous 19-year flux measurements to quantify temporal patterns ET budget (precipitation minus ET, P−ET), as well 0-20 cm change (ΔSWS). At monthly scale, peaked in July (96.7 ± 26.4 mm, Mean S.D.) averaged 41.7 31.9 whose variations were determined slope saturation vapor pressure curve at air temperature, temperatures, regardless vegetation growth stage. P−ET 18.3 26.3 mm August September while stayed deficit during other months. The precipitation May-October growing season non-growing from November April. ΔSWS May (28.8 11.2 mm) (3.0 2.7 almost accumulated zero over whole season. annual scales, none P−ET, changed significantly. 512.2 68.4 exceeded (459.1 58.4 mm), likely due lateral flow supply uphill locations. regulated directly bulk canopy resistance indirectly net radiation. −53.2 95.4 demonstrated clear (−51.6 21.0 driven jointly with opposite but equivalent effects. dominance thermal conditions energy availability variability manifested an energy-limited feature loss shrubland. elucidated that plays retention rather than function through transforming variable input into stable loss. Pathways analysis showed composite condition including its indirect positive effect atmospheric evaporative demand negative transfer resistance. observed (Heat, T , s △), (Demand, R n VPD), (Resistance, r ), moisture (Supply, Rain SWC) classified variables. Numbers neighboring measured variables are their coefficients thickness arrow ten times standardized coefficients. Red solid black dashed arrows (significance levels * P < 0.05, ** 0.01, *** 0.001). 2 represents proportion variance explained model. Abbreviations: : temperature; topsoil △: respect ; radiation; VPD: satur ted deficit; aerodynamic resistance; Rain: precipitation; SWC: 10 content. • Variations long-term eddy measurements. Thermal drove respectively. Monthly related catchment.

Language: Английский

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