Distribution Characteristics and Influencing Factors of Soil Cu in Jieyang City, Guangdong Province

doi:10.19657/j.geoscience.1000-8527.2021.01.29

Abstract

Abstract:

Taking soil collected from Jieyang, Guangdong, China as the study object, the Cu content of 1,330 surface soil samples (0-20 cm) and 331 deep soil samples (150-200 cm) were measured, and the distribution characteristics and influencing factors of soil Cu were studied accordingly. The enrichment factor, GIS spatial analysis and variance analysis were used to comprehensively analyse the enrichment characteristics, spatial distribution characteristics and influencing factors of soil Cu in the study area, and the risk of soil Cu pollution was evaluated according to national standards. The results showed that the average Cu content of surface soil was 9.49 mg/kg, which was far lower than the Cu risk screening value (50 mg/kg) in the “Soil Environmental Quality Risk Control Standard for Farmland Soils (Trial) (GB15618-2018)”. The enrichment degree of copper in surface soil was at the level of non-enrichment and slight enrichment, and there was no obvious copper enrichment. The high value areas of copper in surface soil were mainly distributed in the central Rongcheng district, southeast Jiexi County, and west and north Huilai County. Soil parent material and land use pattern were the main influencing factors of copper content in the surface soil of the study area, and soil type also had certain influence on it. In different parent materials, the Cu content in the Quaternary sediments was the highest; Under different land use types, the Cu content of construction land was significantly higher than other land use types; In different soil types, the Cu content in paddy soil was the highest.

Key words: Jieyang City, soil Cu, distribution characteristic, influencing factor

CLC Number:

X142
P595

HUANG Changchen, WEN Hanhui, CAI Limei, LUO Jie, JIANG Huihao. Distribution Characteristics and Influencing Factors of Soil Cu in Jieyang City, Guangdong Province[J]. Geoscience, 2021, 35(01): 293-300.

Figures/Tables 7

References 35

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土地利用类型	表层	深层	土壤类型	表层	深层	成土母质类型	表层	深层
土地利用类型	样品数	样品数	土壤类型	样品数	样品数	成土母质类型	样品数	样品数
林地及未利用地	641	167	水稻土	471	121	粉砂岩	134	36
建筑用地	350	93	风沙土	26	8	花岗岩	713	171
农耕用地	339	71	黄壤	20	3	凝灰岩	119	34
			赤红壤	813	199	页岩	10	4
						第四纪沉积物	354	86

土地利用类型	表层	深层	土壤类型	表层	深层	成土母质类型	表层	深层
土地利用类型	样品数	样品数	土壤类型	样品数	样品数	成土母质类型	样品数	样品数
林地及未利用地	641	167	水稻土	471	121	粉砂岩	134	36
建筑用地	350	93	风沙土	26	8	花岗岩	713	171
农耕用地	339	71	黄壤	20	3	凝灰岩	119	34
			赤红壤	813	199	页岩	10	4
						第四纪沉积物	354	86

Cu含量/(mg/kg)
最小值	最大值	中值	几何均值	标准差	变异系数/%	背景值^*
0.01	319.20	9.10	9.49	14.04	147.95	10.35

Cu含量/(mg/kg)
最小值	最大值	中值	几何均值	标准差	变异系数/%	背景值^*
0.01	319.20	9.10	9.49	14.04	147.95	10.35

等级	EF值	富集程度	所占比例/%
Ⅰ	≤1	未富集	55.79
Ⅱ	1~2	轻微富集	29.40
Ⅲ	2~5	中度富集	13.61
Ⅳ	5~20	显著富集	1.05
Ⅴ	20~40	强烈富集	0.15
Ⅵ	≥40	极强富集	0