Detection of dissolved organic matter in saline-alkali soils using synchronous fluorescence spectroscopy and principal component analysis
Detection of dissolved organic matter in saline-alkali soils using synchronous fluorescence spectroscopy and principal component analysis
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同步荧光光谱和主成分分析检测盐碱土壤中溶解有机物
DOI：
10.1016/j.saa.2012.11.081
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发表时间：
2013-03-01
影响因子：
4.4
通讯作者：
Deng, Yu
中科院分区：
文献类型：
--
作者：
Guo, Xu-jing;Yuan, Dong-hai;Deng, Yu
溶解有机质（DOM）在土壤主要生物地球化学过程中起着关键作用。其分子特征可以反映其来源和生物地球化学历史。盐碱土样品采集于荒漠和半荒漠地区的农田。同步荧光光谱法分析DOM。采用同步荧光光谱的主成分分析（PCA）来检测和描述不同土壤剖面中DOM的变化。PCA分析产生了2个pc，占方差的97%。DOM在I区（PC1 > 0.9, PC2 < 0.3）以酪氨酸样荧光团为主，包括Ke02、Ke03、Ke04、Rh02、Rh03、Rh04、Sa04和Sc04土壤。区域II包括Kf02、Sa01、Yb01、Yzd01和Yzd02， PC2较高（>0.9），PC1较低(
Dissolved organic matter (DOM) is attributed a key role in soil major biogeochemical processes. Its molecular characteristics can reflect both its source and its biogeochemical history. Saline-alkali soil samples were collected from a field in desert and semi-desert region. DOM was analyzed by synchronous fluorescence spectroscopy. Principal Components Analysis (PCA) of synchronous fluorescence spectra was used to detect and describe changes in the DOM in different soil profiles. The analysis of PCA yielded 2 PCs that account for 97% of the variance. DOM is characterized by a dominant tyrosine-like fluorophore in the Region I (PC1 > 0.9, PC2 < 0.3), including soils Ke02, Ke03, Ke04, Rh02, Rh03, Rh04, Sa04 and Sc04. The region II including Kf02, Sa01, Yb01, Yzd01 and Yzd02 obtain higher PC2 (>0.9) and lower PC1 (