西藏易贡湖流域地表水水化学特征及其控制因素

doi:10.13866/j.azr.2024.02.08

Abstract

Abstract:

This study examines the hydrochemical characteristics and controlling factors of surface water in the Yigong Lake Basin, southeast Tibet, through the collection of 26 groups of surface water samples. Linear trend diagrams, Gibbs diagrams, and Piper diagrams of the main ions in the water sample points were drawn. Moreover, correlation analysis, linear trend analysis, mathematical statistics, and ion ratio were used to analyze the surface water’s main ion characteristics and controlling factors in the study area, unveiling its material sources. The results show that the predominant cations in the Yigong Lake Basin surface area were Ca²⁺ and Mg²⁺, while K⁺and Na⁺ levels were relatively low. The hierarchy of cation content was Ca²⁺> Mg²⁺> Na⁺> K⁺. Among anions, $H C O 3 -, S O 4 2 -,$ and Cl^- dominated, with relatively low levels of $N O 3 -$ and F^-. The hierarchy of anion content was $H C O 3 -$ > $S O 4 2 -$ >Cl^-> $N O 3 -$ >F^-, and the concentration value of H₂SiO₃ maintained a steady fluctuation around 6.9 mg·L^-1. The pH value consistently ranged between 7.84 and 8.37, indicating weak alkalinity. The three main ions in the surface water of the Yigong Lake Basin were Ca²⁺, Mg²⁺, and $H C O 3 -$ , and the hydrochemical types were mainly HCO₃-Ca·Mg or HCO₃-Ca. Rock leaching was the primary controlling factor, with minimal influence from cation-alternating adsorption, evaporation, or human activities on water concentration.

Key words: water chemistry, correlation analysis, material source, Yigong Lake Basin

SHAO Jie, YANG Xinjie, CHEN Xiqing, TENG Chao, YI Jinjun, DONG Meiling, ZHANG Zechen, CAO Jun, ZHU Ning, XIAO Deng, SUN Siyuan, LYU Fei. Hydrochemical characteristics and control factors of surface water in the Yigong Lake Basin, Tibet[J].Arid Zone Research, 2024, 41(2): 250-260.

Figures/Tables 10

Fig. 1

Tab. 1

Fig. 2

Fig. 3

Fig. 4

Tab. 2

Correlation analysis between major ions"

	K⁺	Ca²⁺	Na⁺	Mg²⁺	Cl^-	$S O 4 2 -$	$H C O 3 -$	$N O 3 -$	F^-	TDS
K⁺	1.00	-	-	-	-	-	-	-	-	-
Ca²⁺	0.745^*	1.00	-	-	-	-	-	-	-	-
Na⁺	0.228	0.220	1.00	-	-	-	-	-	-	-
Mg²⁺	0.171^**	0.393^*	0.638	1.00	-	-	-	-	-	-
Cl^-	0.024^**	0.123	0.892	0.549^*	1.00	-	-	-	-	-
$S O 4 2 -$	0.323^**	0.827	0.089	0.528^**	0.004	1.00	-	-	-	-
$H C O 3 -$	0.772	0.726	0.665	0.590^**	0.543	0.391^*	1.00	-	-	-
$N O 3 -$	0.171	0.018^**	0.117	0.008	-0.072	-0.003	0.052	1.00	-	-
F^-	-0.167	0.062^**	0.409^*	0.782	0.324	0.388	0.167	0.145	1.00	-
TDS	0.734^*	0.936^**	0.476	0.640^**	0.349	0.768^**	0.886^**	0.039	0.267	1.00

Tab. 2

Fig. 5

Fig. 6

Fig. 7

Fig. 8

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编号	天气状况	水样类型	有无外界干扰	采样日期/年-月-日	编号	天气状况	水样类型	有无外界干扰	采样日期/年-月-日
S1	晴朗	湖水	无	2022-10-13	S14	晴朗	湖水	无	2022-10-15
S2	晴朗	湖水	无	2022-10-13	S15	晴朗	湖水	无	2022-10-15
S3	晴朗	湖水	无	2022-10-13	S16	晴朗	湖水	无	2022-10-15
S4	晴朗	湖水	无	2022-10-13	S17	晴朗	湖水	无	2022-10-15
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Hydrochemical characteristics and control factors of surface water in the Yigong Lake Basin, Tibet

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