1 Geological Survey Institute of Hunan Province,Changsha 410114,China
2 School of Resource and Environment,Northeast Agricultural University,Harbin 150030,China
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文章历史+
Received
Published
Revised
2025-04-02
2026-02-08
2025-11-13
Online Date
2026-09-21
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摘要
针对澧阳平原西部高硒低重金属天然绿色富硒土地的形成机制,运用绝对主成分得分-多元线性回归(absolute principal component score-multiple linear regression,APCS-MLR)模型,对表层土壤中Se和Cd等主要重金属元素的来源及其贡献率进行定量解析,并结合地统计学方法,深入分析不同来源元素的分布特征。结果表明:研究区域土壤整体呈现良好的环境质量特征;烟花爆竹、非金属建材工业活动及相关的交通运输业对土壤中As、Cd、Cr、Ni、Cu、Pb、Zn等元素的含量水平产生了提升作用,但是影响范围和程度可控;研究区西部物源区的高硒含量与高Se/Cd比值是本区形成全国硒含量最高的天然绿色富硒土壤的关键因素;研究区长期的水稻种植显著增加了土壤中的硒次生富集,成为维持全域高Se/Cd比的核心补充机制。
Abstract
The formation mechanism of the naturally green selenium-rich land characterized by high selenium and low heavy metal concentrations in the western Liyang Plain was investigated. An absolute principal component score-multiple linear regression(APCS-MLR) model was utilized to quantitatively assess the sources and contribution rates of major heavy metal elements (such as Se and Cd in surface soils,supplemented by geostatistical methods to analyze the spatial distribution patterns of elements from distinct sources. The results indicate that favorable environmental quality is exhibited throughout the study area. Activities involving fireworks and firecrackers,non-metallic building materials industries,and related transportation sectors contribute to elevated concentrations of elements such as As,Cd,Cr,Ni,Cu,Pb,and Zn in soil,however,the spatial extent and magnitude of the impact remain manageable. The exceptionally high selenium content and elevated Se/Cd ratio in the provenance area of the western sector are characterized as critical determinants enabling the development of this naturally high-selenium green soil in China. Secondary selenium enrichment in soils is significantly augmented by long-term rice cultivation,representing a core supplementary mechanism sustaining the universally high Se/Cd ratio observed across the region.
LIN Zhi-jia, SONG Jiang-tao, GUO Si-yu, XIANG Ke, LI Xiang-yu.
Source Apportionment and Geostatistics Uncover the Genesis of High-Se and Low-Cd Soil in Western Liyang Plain[J].
Science Technology and Engineering, 2026, 26(4): 1735-1744 DOI:10.12404/j.issn.1671-1815.2502261
本次研究所用样品在具有中国地质调查局54项分析测试能力认证的湖南省地质调查所测试中心完成测试,严格执行《区域地球化学样品分析方法》(DZ/T 0279—2016)的相关要求。pH测定方法为离子选择性电极法(ion-selective electrode,ISE),有机质经重铬酸钾氧化-外加热法处理后,采用容量法(volumetric method,VOL)测定。土壤As、Hg、Se的测定采用原子荧光光谱法(atomic fluorescence spectrometry,AFS),其他元素采用等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)。
1.3 APCS-MLR模型
绝对主成分得分(absolute principal component score,APCS) 是根据主成分分析(principal component analysis,PCA)结果确定的,通过特征值(>1)或者累计方差>80%来确定主成分[17]。PCA结果中,较大的方差贡献率表明主成分具有更强的解释原始数据的能力,因子载荷反映了主成分中每个变量的相对重要性,因子载荷值为>0.75、0.75~0.5和0.5~0.3分别定义为强、中和弱[18]。
使用APCS 值作为自变量,样本中某个指标的含量作为因变量,进行多元线性回归(multiple linear regression,MLR)[13]。需要注意的是,对于多元分析,APCS-MLR模型中应该有足够的自由度。因此,如果要得出稳定的结果,所采用的样本数据集必须比变量有更多的观测值(如样本数量≥变量+50)[13]。APCS-MLR模型的主要计算过程如式(1)~式(4)所示。
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