华南农业大学学报2017，Vol.38Issue(1)：44-49,6.DOI:10.7671/j.issn.1001-411X.2017.01.008
不同种植年限苏打盐碱型水稻土水溶性有机物三维荧光光谱特征分析
Three-dimensional fluorescence spectral characteristics of water extractable organic matter in soda saline-alkaline paddy soil with different planting years of rice
摘要
Abstract
Objective] To investigate the changing patterns of water extractable organic matter ( WEOM) in soda saline-alkaline paddy soil in the fields with different planting years of rice, and provide a theoretical basis for increasing organic carbon fixation in such soil. [Method] Three-dimensional fluorescent spectroscopy was performed to study the contents and fluorescence characteristics of WEOM in soda saline-alkaline paddy soil with 0, 1, 3, 5, 15 and 20 planting years of rice. [Result] With the increase of planting age, the content of WEOM in soil first increased and then decreased, reached the maximum ( 259. 29 mg · kg-1 ) after planting rice for three years, and was the lowest ( 19. 29 mg·kg-1 ) after planting rice for 20 years. The absorbance of WEOM at UV 254 nm increased with planting age. The shape of the three-dimensional fluorescence spectra of WEOM was different from fluorescence linear density which increased with planting age. There was a blue shift in the emission wavelength of the fluorescence peak in region I and region II of paddy soil, and a red shift in region Ⅲand region Ⅴ. The fluorescence regional integration values were region Ⅴ> region Ⅲ> region Ⅳ>region Ⅱ> regionⅠ. The proportion of humic acid-like substance in WEOM was reduced after planting rice for 20 years. [Conclusion] The humic substances, fulvic acid-like substance and unsaturated aromatic compounds in soda saline-alkaline paddy soil increase with planting age. Three-dimensional fluorescence technique can be applied to study the structure and composition of WEOM in soil.关键词
种植年限/苏打盐碱型水稻土/水溶性有机物/三维荧光光谱Key words
planting age/soda saline-alkaline paddy soil/water extractable organic matter/three-dimensional florescence spectra分类
农业科技引用本文复制引用
李亚男,武俊男,高强,高云航,刘淑霞..不同种植年限苏打盐碱型水稻土水溶性有机物三维荧光光谱特征分析[J].华南农业大学学报,2017,38(1):44-49,6.基金项目
吉林省科技发展计划(20160307006NY) （20160307006NY）
现代农业产业技术体系建设专项(nycytx-38) （nycytx-38）
