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河套平原表层土壤中天然有机氯代物的空间分布特征

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为查明河套平原表层土壤中天然有机氯代物(Clorg)的空间分布特征及影响因素,在河套平原采集55个表层土壤(0~20 cm)样品,对其理化性质(质地、pH值、总有机碳含量)及不同形态氯元素含量进行分析,并通过采用描述性统计、相关性分析等方法对分析数据进行处理.结果表明:土壤中天然Clorg的含量在18.84~182.75 mg/kg之间,其平均含量为56.06 mg/kg,占总氯(Cltot)含量的1.74%~92.81%;空间上,河套平原西部黄河冲积扇平原表层土壤中天然Clorg含量整体高于东部黄河泛滥冲积平原表层土壤;土壤中天然C1org的含量与氯离子(Cl-)含量呈正相关关系、与pH值呈负相关关系、与总有机碳(TOC)含量之间相关性不显著;土壤质地明显影响土壤中天然Clorg的含量,其中砂质壤土中天然Clorg的平均含量最高;天然C1org在研究区表层土壤中普遍存在,其空间分布格局是C1、TOC、pH值、土壤质地等多因素共同作用的结果,较高的Cl-含量、较低的pH值以及砂质壤土更有利于土壤中天然Clorg的积累,在较高盐度水平下,TOC含量对表层土壤中天然Clorg的积累无显著影响.
Spatial distribution characteristics of natural organochlorine in topsoil of Hetao Plain
To find out the distribution and influencing factors of natural organochlorine(Clorg)in the topsoil of Hetao Plain,this work collected 55 topsoil samples(0-20 cm)from Hetao Plain to analyze the soil physical and chemical properties(texture,pH,total organic carbon)and the content of different forms of chlorine.Descriptive statistics and correlation analysis show that natural Clorg content ranges from 18.84 to 182.75 mg/kg(mean value of 56.06 mg/kg),accounting for 1.74%-92.81%of the total chlorine(Cltot).The natural Clorg content in the western alluvial fan plain of the Yellow River is higher than that in the eastern floodplain.The content of natural Clorg in the topsoil is related to the chloride(Cl-)content and soil pH value,except total organic carbon(TOC)content.Soil texture obviously affects the content of natural Clorg in topsoil,and the average value is the highest in sandy loam.It is concluded that natural Clorg is ubiquitous in the study area topsoil,and the spatial distribution of natural Clorg is affected by Cl-,TOC,pH and soil texture jointly.High Cl-content,low pH value and sandy loam are favorable conditions for the natural Clorg accumulation in the topsoil,while this influence is insignificant from TOC content at high salinity levels.

natural organochlorinespatial distribution characteristictopsoilHetao Plain

孔瑶瑶、陈柳竹、巨凡凡、陈占强、陈钰、彭子琪

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中国地质大学(武汉)环境学院,湖北 武汉 430078

天然有机氯代物 空间分布特征 表层土壤 河套平原

国家自然科学基金青年科学基金项目

41807207

2024

安全与环境工程
中国地质大学

安全与环境工程

CSTPCD北大核心
影响因子:1.03
ISSN:1671-1556
年,卷(期):2024.31(4)
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