摘要
采用ASD光谱仪测量111个北京地区农业土壤样本光谱曲线基础上,利用光谱分析的方法探索北京地区农业土壤中8种土壤重金属（Cr、Ni、Cu、Zn、As、Cd、Pb、Hg）含量与可见-近红外光谱反射率的相关关系,分析土壤重金属的光谱特征,为基于遥感光谱监测土壤重金属含量提供基础。主成分分析和光谱变量与土壤重金属相关分析的研究结果表明,一阶微分光谱最适于获取土壤中的重金属元素信息,并且土壤重金属含量与反射光谱之间存在显著相关关系,最高相关系数达到а=0.01水平显著相关,中心波长在415-570 nm以及大于950 nm的光谱部分是土壤重金属特征光谱的主要分布范围。
Soil heavy metal contaminations have severe negative effects on ecology and life.Thus,soil environmental monitoring and evaluation are now extremely important for regional environment protection.As one of the modern fast developing techniques,spectroscopy analysis can provide the rapid and nondestructive correlation analysis of spectrum with chemical and physical properties of soil components.A total of 111 soil samples in Beijing agricultural soils are selected,and we measure their spectrum in 350-1050 nm（UV/VNIR） by ASD FieldSpec Pro.In this paper,the main objective is trying to find the characteristic and diagnostic spectral bands of the soil heavy metals including Cr,Ni,Cu,Zn,As,Cd,Pb,and Hg with principal component analysis（PCA） and correlation analysis.Results show that first-order derivative spectrum is a perfect choice to extract information of soil heavy metals compared to the original spectrum and their second-order derivative,and PCA can describe the major structure of their spectrum,bivariate correlation analysis further to explore the quantitative relationship between diagnostic spectral bands and the content of soil heavy metals.There exist significant correlations at 0.01-level between soil heavy metals and the diagnostic spectral bands.Spectrum of 415-570 nm center wavelength and more than 950 nm（less than 1025 nm） are the main characteristic and diagnostic bands of soil heavy metals in Beijing.The research on soil spectral reflectance features is the basis for soil properties monitoring and evaluation with regional remote sensing images.At the same time,regional monitoring with remote sensing needs to consider more complex conditions： scale effects,complicated environmental factors,influences of other soil properties,a variety of geochemical behavior of soil heavy metals,and et al.
出处
《土壤通报》
CAS
CSCD
北大核心
2011年第3期730-735,共6页
Chinese Journal of Soil Science
基金
国家科技支撑项目(2006BAB15B05)
北京市财政局项目资助
关键词
土壤重金属
可见光-近红外
光谱特征
Soil heavy metal
ASD
Visible-near infrared
Characteristic spectral band
