Distribution of Selenium and Its Influencing Factors in Soils of Puning City, Guangdong Province

doi:10.19657/j.geoscience.1000-8527.2019.01.15

Abstract

Abstract:

A systematic investigation of soil selenium in the region of Puning City was carried out, and 413 samples of surface soil (0-20 cm) and 103 samples of deep soil (>150 cm) were collected systematically and analyzed for content, distribution and influencing factors of soil Se. Results showed that the content of total selenium in the surface soils ranged from 0.16 mg/kg to 2.01 mg/kg with a mean value of 0.63 mg/kg, which meant that the soils were in the category of Se sufficiency or Se abundance on the whole, with none in the category of Se deficiency or excessive Se. Among the different types of soils, total Se content was the highest in red soil formed by sand shale, averaging 0.86 mg/kg,and the lowest in paddy soils developed in delta sediments, averaging 0.41 mg/kg. Among the different types of parent materials, the highest content was recorded in Jurassic shale with an average Se content of 0.89 mg/kg, while the lowest in Quaternary sediment with an average of 0.41 mg/kg. Correlation and regression analysis showed that soil Se content was significantly and positively related to contents of iron and aluminum, soil total organic carbon (SOC), but negatively to soil pH. Soil parent material was the major factor influencing selenium concentration and distribution in the soil of Puning City, whereas land use, soil pH, SOC, iron and aluminum also played important roles.

Key words: Puning City, soil total selenium, distribution characteristic, influencing factor

CLC Number:

P595
X142

JIANG Huihao, LUO Jie, CAI Limei, MU Guizhen, TANG Cuihua, WANG Qiushuang, WANG Shuo, SUN Rongrong. Distribution of Selenium and Its Influencing Factors in Soils of Puning City, Guangdong Province[J]. Geoscience, 2019, 33(01): 161-168.

Figures/Tables 9

References 36

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地区	平均值/(mg/kg)	变幅/(mg/kg)	数据来源
普宁市(表层)	0.630	0.16~2.01	本文
普宁市(深层)	0.591	0.17~1.21	本文
海南省	0.765	0.055~2.231	[13]
香港	0.760	0.07~2.26	[14]
北京市	0.200	0.04~5.26	[15]
黑龙江省	0.147	0.008~0.660	[16]
南宁市	0.570	0.09~1.34	[21]
西藏	0.150	0.049~0.365	[22]
张家口市	0.136	0.043~0.263	[23]
中国	0.290	0.050~0.990	[17]
世界	0.400	—	[1]
地壳丰度	0.130	—	[24]

地区	平均值/(mg/kg)	变幅/(mg/kg)	数据来源
普宁市(表层)	0.630	0.16~2.01	本文
普宁市(深层)	0.591	0.17~1.21	本文
海南省	0.765	0.055~2.231	[13]
香港	0.760	0.07~2.26	[14]
北京市	0.200	0.04~5.26	[15]
黑龙江省	0.147	0.008~0.660	[16]
南宁市	0.570	0.09~1.34	[21]
西藏	0.150	0.049~0.365	[22]
张家口市	0.136	0.043~0.263	[23]
中国	0.290	0.050~0.990	[17]
世界	0.400	—	[1]
地壳丰度	0.130	—	[24]

含量分级	全量硒/(mg/kg)	硒效应	面积比例/%
含量分级	全量硒/(mg/kg)	硒效应	表层土壤	深层土壤
缺乏	<0.125	硒反应不足	0	0
边缘	0.125~0.175	硒潜在不足	0	0
中等	0.175~0.60	足硒	49.79	61.92
高硒	0.60~3.0	富硒	50.21	38.08
过剩	>3.0	硒中毒	0	0

含量分级	全量硒/(mg/kg)	硒效应	面积比例/%
含量分级	全量硒/(mg/kg)	硒效应	表层土壤	深层土壤
缺乏	<0.125	硒反应不足	0	0
边缘	0.125~0.175	硒潜在不足	0	0
中等	0.175~0.60	足硒	49.79	61.92
高硒	0.60~3.0	富硒	50.21	38.08
过剩	>3.0	硒中毒	0	0

土壤类型	样品数 /个	硒含量/(mg/kg)			标准偏差	变异系数/%
土壤类型	样品数 /个	最大值	最小值	平均值	标准偏差	变异系数/%
赤红壤^a	258	1.34	0.19	0.79	0.29	37
赤红壤^b	62	2.01	0.40	0.86	0.28	33
水稻土	93	1.00	0.16	0.41	0.15	37
研究区	413	2.01	0.16	0.63	0.27	43