不同土地利用方式对苏打盐碱土水溶性有机物荧光特性的影响

利用三维荧光光谱技术考察吉林省西部不同土地利用方式(草原、旱田和水田)对苏打盐碱土水溶性有机物荧光特性的影响.结果表明:水田中有机物质的质量比最高,为27.08g/kg,草原中有机物质的质量比最低,为21.63g/kg;水溶性有机物(WEOM)的质量比为水田旱田草原,芳香化程度为草原水田旱田,其值分别为3.90,3.79,3.31L/(mg·m);WEOM三维荧光光谱在区域Ⅲ和区域Ⅴ的荧光强度最高;WEOM荧光区域积分值为类腐殖酸类富里酸类溶解性微生物的代谢产物类色氨酸蛋白质类酪氨酸蛋白质;类富里酸质量比为草原旱田水田,类溶解性微生物代谢产物的质量比为水田旱田草原,类腐殖酸质量比为旱田草原水田.即不同土地利用方式对土壤中WEOM的质量比和组成影响显著.

Effects of Fluorescence Characteristics on Water Extractable OrganicMatter in Soda Saline-Alkali Soil under Different Land Use Patterns

By using the technology of three dimensional fluorescence spectroscopy, we studied the effects of fluorescence characteristics on water extractable organic matter in soda saline\|alkali soil (grassland, dry farmland, paddy field) under different land use patterns in the west of Jilin Province. The results show that the mass ratio of organic matter in paddy field is the highest, 2708 g/kg, while the mass ratio of organic matter in grassland is the lowest, 21.63 g/kg. The mass ratio of water extractable organic matter (WEOM) is paddy field>dry farmland>grassland. The aromatic concentration is grassland>paddy field>dry farmland, and the values are 390,379,331 L/(mg·m). The fluorescence intensity of region Ⅲ and region Ⅴ is the highest in three dimensional fluorescence spectra of WEOM. The integral values of WEOM fluorescence region are humic acid like>fulvi acid like>solublemicrobial byproduct like substance>tyrosine like protein>tryptophan like protein. The mass ratios of fulvic acid like are grassland>dry farmland>paddy field, the mass ratios of soluble microbial byproduct like substance are paddy field>dry farmland>grassland, JP+1]and the mass ratios of humic acid like are dry farmland>grassland>paddy field. It indicated that different land use had significant effect on the mass ratio and compos ition of WEOM in soil.