西安市河流沉积物重金属分布特征及其与土地利用类型关系

doi:10.13866/j.azr.2022.04.27

Abstract

Abstract:

Typical urban rivers in Xi’an (Ba River, Chan River, Feng River, and Hei River) were selected as the research object to understand the impact of different land-use types on the distribution of heavy metals in river sediments. The spatial distribution, environmental risks, and sources of heavy metals (Cr, Mn, Ni, Cu, Zn, Cd, and As) in river sediments were analyzed and evaluated using potential ecological risk (RI), pollution load index (PLI), correlation analysis, and principal component analysis. Results showed that the content of heavy metals in the sediments of the four rivers was presented in the following order: Chan River > Ba River > Hei River > Feng River. The RI results showed that Cd remarkably contributed to the pollution, and the four rivers were all at moderate potential ecological risk. The PLI results showed that the H1 sample site in Hei River was moderately polluted, which was the highest. The RI and PLI results showed that the sample sites in the Chan River were the most polluted, and they were concentrated in the middle and lower reaches where the proportion of artificial ground and intensity of human activities were high. In addition, the results of correlation analysis and principal component analysis showed that most heavy metals came from human activities such as emissions from industrial and agricultural production and traffic pollution. Therefore, attention should be paid to the prevention and control of Cd pollution, particularly in the middle reaches of Feng River and Hei River, to prevent further pollution.

Key words: urban rivers, heavy metals in sediments, spatial distribution, land use types, ecological risks

HU Changtong,YANG Tao,WAN Xuhao,SUN Laikang,ZHENG Yiwen,YAN Xuerong. Distribution characteristics of heavy metals in river sediments and their relationship with land use types in Xi’an City[J].Arid Zone Research, 2022, 39(4): 1270-1281.

Figures/Tables 12

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References 52

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E_r	生态风险	RI	生态风险
E_r<40	低	RI<150	低
40≤E_r<80	轻度	150≤RI<300	轻度
80≤E_r<160	中度	300≤RI<600	中度
160≤E_r<320	高	RI≥600	高
E_r≥320	非常高	-	-

	样品数量		Cr	Mn	Ni	Cu	Zn	Cd	As
西安市河流	24	平均	45.53	810.60	33.07	32.01	88.33	0.44	6.31
		C_v/%	75.81	42.53	71.56	56.53	39.84	140.75	53.25
灞河	8	平均	19.94	767.92	39.88	27.77	93.19	0.49	5.78
		C_v/%	105.25	39.89	84.53	30.76	26.70	144.98	46.63
浐河	8	平均	44.73	1007.71	28.02	34.38	102.69	0.44	6.73
		C_v/%	39.71	28.48	13.44	31.51	40.59	91.22	23.08
沣河	4	平均	49.25	601.46	20.33	25.00	79.71	0.46	4.88
		C_v/%	28.74	27.88	47.73	58.43	32.76	144.43	30.62
黑河	4	平均	94.58	710.92	42.29	42.75	58.54	0.42	7.97
		C_v/%	43.64	62.5	56.69	79.61	42.37	143.03	79.79
背景值			62.50	557.00	28.80	25.90	73.00	0.094	11.10

范围	Cr	Mn	Ni	Cu	Zn	Cd	As
100 m	林地-0.69^**	林地-0.55^*	林地-0.68^**	林地-0.50^*	-	-	林地-0.66^**
	-	-	-	-	-	-	草地-0.80^**
300 m	林地-0.55^*	草地-0.50^*	林地-0.54^*				林地-0.52^*
	草地-0.55^*	-	-	-	-	-	-
500 m	林地-0.54^*	林地-0.62^**	-	-	-	-	-
	草地-0.53^*	草地-0.51^*	-	-	-	-	-
800 m	林地-0.50^*	林地-0.54^*	-	-	-	-	-
1500 m	林地-0.51^*	林地-0.51^*	-	-	-	-	-
河岸带人类活动强度指数	0.72^**	0.83^**	0.72^**	0.51^*	-	0.62^*	0.72^**

河流	Cr	Mn	Ni	Cu	Zn	Cd	As	RI
灞河	0.64	1.38	6.92	5.36	1.28	139.63	5.20	160.41
浐河	1.43	1.81	4.86	6.64	1.41	139.63	6.07	161.84
沣河	1.58	1.08	3.53	4.83	1.09	146.28	4.40	162.78
黑河	3.03	1.28	7.34	8.25	0.80	132.98	7.18	160.86

Distribution characteristics of heavy metals in river sediments and their relationship with land use types in Xi’an City

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