Relationship between hydrogen and oxygen stable isotope compositions of soil water and soil water storage in Shaliuhe River Basin of Qinghai Lake

doi:10.7522/j.issn.1000-694X.2022.00053

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (6): 153-164.DOI: 10.7522/j.issn.1000-694X.2022.00053

Relationship between hydrogen and oxygen stable isotope compositions of soil water and soil water storage in Shaliuhe River Basin of Qinghai Lake

Yaofang Hou(), Shengkui Cao(), Guangchao Cao, Zhigang Wang, Youcai Wang, Ligang Kang

College of Geographical Sciences / Key Laboratory of Physical Geography and Environmental Process / Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation / Academy of Plateau Science and Sustainability （People's Government of Qinghai Province & Beijing Normal University），Qinghai Normal University，Xining 810008，China

Received:2021-10-19 Revised:2022-04-06 Online:2022-11-20 Published:2023-01-09
Contact: Shengkui Cao

Abstract

Abstract:

Hydrogen and oxygen stable isotope technology and soil water storage are both effective means to explore regional soil moisture characteristics. Based on the data of hydrogen and oxygen stable isotopic composition of soil water （δ²H and δ¹⁸O） and soil water storage in Shaliu River Basin of Qinghai Lake， this paper analyzes the spatial distribution characteristics of soil water in the basin， and discusses the correlations between hydrogen and oxygen stable isotopic composition of soil water and soil water storage. The results show that：（1） The δ¹⁸O value of soil water in the Shaliu River Basin shows a trend of enrichment-dilution-enrichment from the northwest to the southeast； The d-excess value of soil water is the lowest in the southern part of the basin， and the highest in the upper reaches of the tributary in the northeastern part of the basin. （2） During the study period， the spatial distribution of soil water storage in the basin showed a trend of high in the north and low in the south. （3） There is a piecewise linear relationship between soil water δ¹⁸O value， d-excess value and soil water storage. When the soil water storage in each soil layer of 0-30 cm is less than or equal to 30 mm， the soil water storage of each soil layer has a significant negative correlations with the δ¹⁸O value of soil water， and a significant positive correlations with the d-excess value. The spatial difference of the natural geographical environment and vegetation characteristics in the Shaliu River Basin of Qinghai Lake leads to obvious spatial variability in the stable isotope composition of hydrogen and oxygen in soil water and soil water storage. The effect of temperature change on the correlations between the hydrogen and oxygen stable isotope composition of soil water and soil water storage is realized through its effect on soil evaporation.

Key words: soil water, hydrogen and oxygen stable isotope compositions, soil water storage, Qinghai Lake, Shaliuhe River Basin

CLC Number:

S153

Yaofang Hou, Shengkui Cao, Guangchao Cao, Zhigang Wang, Youcai Wang, Ligang Kang. Relationship between hydrogen and oxygen stable isotope compositions of soil water and soil water storage in Shaliuhe River Basin of Qinghai Lake[J]. Journal of Desert Research, 2022, 42(6): 153-164.

Figures/Tables 9

Fig.1 Location of the study region and distribution of soil water sampling points

Fig.2 Distribution map of temperature （T）， Normalized Vegetation Index （NDVI）， monthly precipitation（P）， monthly evapotranspiration （ET）， difference between monthly precipitation and evapotranspiration （P-ET） in the Shaliu River Basin in September 2020

Fig.3 Spatial distribution of δ18O soil water in the Shaliu River Basin in September 2020

Fig. 4 Spatial distribution of d-excess values in soil water in the Shaliu River Basin in September 2020

Fig.5 Spatial distribution of soil water storage in soil profile in Shaliu River Basin in September 2020

Fig.6 The relationship between soil water storage and soil water δ18O and d-excess values in the Shaliu River Basin

Fig.7 Correlations between soil water δ18O， d-excess value， soil water storage and environmental factors in different height zones 3 200-3 500 m （A）， 3 500-3 800 m （B）， 3 800-4 200 m（C）， and the whole basin （D） in the Shaliu River Basin

Table 1 Correlations between soil water storage and different environmental factors in the Shaliu River Basin in September 2020

SWS	Al	T	P	ET	NDVI	δ¹⁸O	d-excess
0—10 cm， SWS≤30 mm	0.60^**	-0.70^**	0.30	0.29	0.12	-0.34^*	0.58^**
10—20 cm， SWS≤30 mm	0.43^**	-0.52^**	0.18	0.05	0.10	-0.53^**	0.63^**
20—30 cm， SWS≤30 mm	0.42^**	-0.48^**	0.28	0.21	0.09	-0.39^**	0.58^**
0—30 cm， SWS≤100 mm	0.56^**	-0.65^**	0.35^*	0.09	0.19	-0.64^**	0.77^**

Table 2 Relation of soil water storage to vertical decrease rate of temperature in Shaliu River Basin in September 2020

土壤储水量（SWS）	土层/cm
土壤储水量（SWS）	0—10	10—20	20—30
≤30 mm	0.79	0.81	0.79
≥30 mm	0.54	0.51	0.53

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Relationship between hydrogen and oxygen stable isotope compositions of soil water and soil water storage in Shaliuhe River Basin of Qinghai Lake

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