Temporal and spatial response characteristics of evapotranspiration to soil water content in Qinghai Lake Basin

doi:10.7522/j.issn.1000-694X.2024.00038

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (3): 202-212.DOI: 10.7522/j.issn.1000-694X.2024.00038

Temporal and spatial response characteristics of evapotranspiration to soil water content in Qinghai Lake Basin

Lianxuan Chen¹(), Shengkui Cao¹^,²(), Guangchao Cao¹^,², Yizhen Lei¹, Haoran Zhao¹, Wenbin Li¹

^1.School of Geographical Sciences / Qinghai Province Key Laboratory of Physical Geography and Environment Process / Ministry of Education Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation，Qinghai Normal University，Xining 810008，China
^2.Academy of Plateau Science and Sustainability，People's Government of Qinghai Province & Beijing Normal University，Xining 810008，China

Received:2024-01-30 Revised:2024-03-03 Online:2024-05-20 Published:2024-06-11
Contact: Shengkui Cao

Abstract

Abstract:

Studying the spatial and temporal response characteristics of evapotranspiration to soil water content aids in comprehending regional hydrological cycle processes. The 8-day， monthly， and annual variation characteristics and corresponding relationship between evapotranspiration and soil water content in Qinghai Lake Basin were investigated from 2016 to 2020 by remote sensing data and spatial analysis， mathematical and statistical methods of ArcGIS， which would reveal the spatial and temporal response. The results indicated that：（1） From 2016 to 2020， the average evapotranspiration and soil water content in the Qinghai Lake Basin were 494.45 mm and 0.34 m³·m^-3， respectively. The 8-day， monthly， and annual evapotranspiration showed an increasing-then-decreasing trend， while the soil water content showed the increasing-decreasing-increasing-decreasing， increase-steady-decrease and comparable stable characteristics. （2） The average evapotranspiration across all time scales generally decreased from the northeast to the southwest of Qinghai Lake Basin. Additionally， the average soil water content increased from the lakeshore to the perimeter of the watershed and from the valley to the sides. （3） There is a temporal synergism between evapotranspiration and soil water content during the 1st-185th days （January-June） and the 241st-365th days （September-December）， which is stronger than that during the 185th-241th days （July-August）. This synergism during the non-growing season is also stronger than the growing season， and stronger in 2016-2018 than in 2018-2020. Additionally， spatial synergies were found to be stronger in the northeast of Shaliu River Basin and Haergai River Basin and the eastern shore of Qinghai Lake than in other areas. （4） The correlation coefficients between evapotranspiration and soil water content were calculated at different temporal scales. The coefficients were 0.61， 0.69， 0.36 and 0.24 for the 8-day， monthly， non-growing season and growing season scales， respectively. The spatial result showed significant positive correlations， indicating that the temporal response of evapotranspiration to soil water content was stronger at the monthly and 8-day scales. In addition， the results showed that evapotranspiration increased with the increase of soil water content in different time. The results of this study can provide theoretical reference for understanding the hydrological cycle process， water balance and water resources management in Qinghai Lake Basin.

Key words: evapotranspiration, soil water content, temporal and spatial response characteristics, Qinghai Lake Basin

CLC Number:

P333.1

Lianxuan Chen, Shengkui Cao, Guangchao Cao, Yizhen Lei, Haoran Zhao, Wenbin Li. Temporal and spatial response characteristics of evapotranspiration to soil water content in Qinghai Lake Basin[J]. Journal of Desert Research, 2024, 44(3): 202-212.

Figures/Tables 12

Fig.1 Location of the study area

Fig.2 Temporal variations of 8-day evapotranspiration （A） and soil water content （B） in Qinghai Lake Basin from 2016 to 2020

Fig.3 Spatial distribution of 8-day average evapotranspiration （A） and average soil water content （B） in Qinghai Lake Basin from 2016 to 2020

Fig.4 Temporal variations of monthly evapotranspiration （A） and soil water content （B） in Qinghai Lake Basin from 2016 to 2020

Fig.5 Spatial distribution of average evapotranspiration and average soil water content during the non-growing （A， C） and growing （B， D） seasons in Qinghai Lake Basin from 2016 to 2020

Table 1 Temporal variations of annual evapotranspiration and soil water content in Qinghai Lake Basin from 2016 to 2020

指标	年份
指标	2016	2017	2018	2019	2020
蒸散量/mm	471.77	522.57	498.58	497.41	481.91
土壤含水量/（m³·m^-3）	0.34	0.34	0.34	0.34	0.34

Fig.6 Spatial distribution of 5-year average evapotranspiration （A） and average soil water content （B） in Qinghai Lake Basin

Fig.7 Variation characteristics of 8-day evapotranspiration and soil water content in Qinghai Lake Basin

Fig.8 Spatial distribution of correlation coefficients and significance test between evapotranspiration and soil water content at 8-day （A，E）， monthly （B，F）， non-growing season （C，G） and growing season （D，H） scale in Qinghai Lake Basin

Fig.9 Heatmaps of non-growing season （A，D）， growing season （B，E） and annual （C，F） average evapotranspiration and average soil water content in sub-basins of Qinghai Lake Basin

Fig.10 Responses of 8-day （A） and monthly （B） scale evapotranspiration to soil water content in Qinghai Lake Basin

Fig.11 Evapotranspiration and soil water content at different altitudes at 8-day （A）， non-growing season （B）， growing season （C） and annual scale （D） in Qinghai Lake Basin

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Temporal and spatial response characteristics of evapotranspiration to soil water content in Qinghai Lake Basin

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