土壤磷形态的反射光谱特征及其光谱建模  

The reflectance spectra characteristics of soil phosphorus fractions and their spectral model

作　　者：侯广利 李雪莹 邱慧敏 吕红敏 刘钰祥 范萍萍 HOU Guang-li;LI Xue-ying;QIU Hui-min;Lü Hong-min;LIU Yu-xiang;FAN Ping-ping(Institute of Oceanographic Instrumentation,Qilu University of Technology(Shandong Academy of Sciences),Qingdao 266061,China;School of Chemistry and Pharmaceutical Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China)

机构地区：[1]齐鲁工业大学(山东省科学院)山东省科学院海洋仪器仪表研究所,山东青岛266061 [2]齐鲁工业大学化学与制药工程学院,山东济南250353

出　　处：《山东科学》2021年第1期82-88,共7页Shandong Science

基　　金：国家自然科学基金(31300414);山东省自然科学基金(ZR2018LD007)。

摘　　要：由于对土壤磷的可见-近红外反射光谱的特征认识不足,土壤磷的光谱模型稳定性较差。为此,通过分离不同磷组分,分别以标准白板和残渣样品为参考光谱,间接和直接测定了不同磷组分的反射光谱。通过分析其光谱特征及光谱模型的间接和直接结果,发现各磷形态具有显著不同的反射光谱特征,光谱形状、反射率大小及峰/谷位置均不同,能够被现有可见-近红外光谱(200~1000 nm)定性和定量分析。在现有研究波段内,250~750 nm是土壤磷的敏感波段。研究结果为认识全磷的反射光谱特征及预测全磷含量提供了理论依据。The spectral model of soil phosphorous(P)has relatively poor stability,mainly owing to the insufficient understanding of its visible and near-infrared spectral characteristics.To this end,we propose a new method to explore the reflectance spectrum of total P using soil residues by sequentially extracting different P fractions.In particular,the reflectance spectra of different P fractions were measured indirectly using the standard whiteboard as the reference spectrum and measured directly using the soil residues as the reference spectrum.The spectral characteristics of these P fractions and their spectral models were analyzed.Both indirect and direct results showed that each P fraction had a specific reflectance spectrum with different spectral characteristics,spectral shapes,reflectance rates,and peak/valley positions.Therefore,they could be qualitatively and quantitatively analyzed by visible and near-infrared spectroscopy(200~1000 nm).Results suggesteed that 250~750 nm is the sensitive band of soil P.This study can provide an important theoretical basis for understanding the reflectance spectrum and predicting the concentrations of total P.

关 键 词：土壤磷形态 可见-近红外反射光谱 钙磷 铁磷 氧磷 光谱模型 

分 类 号：S151.9[农业科学—土壤学] O657.3[农业科学—农业基础科学]