摘 要：
采用元素分析和谱学方法对施入玉米植株残体后的土壤FA的变化进行了研究,结果表明,施入玉米植株残体后土壤FA的C、H、N含量均升高,而O的含量降低,并且C/H、O/C和C/N比值均降低。土壤中FA的羧基含量减少,芳香碳的含量下降,FA的氧化程度降低,芳香度显著下降,FA的分子结构向更为简单化的方向发展。同时,酰胺成分增加,脂族链烃结构成分明显增多。土壤FA与无机矿物质的结合能力相对减弱,FA上的羧基逐渐由羧酸盐的形式向游离的羧基形式过渡。玉米植株残体的加入使FA中糖类结构成分增加。对土壤中FA的影响,施入玉米秸秆和根系残体的处理有一定差别。
译 名：
EFFECTS OF CORN PLANT RESIDUES ON COMPOSITION AND STRUCTURE OF FULVIC ACIDS IN SOILS
作 者：
Wu Jinggui Wang Minghui Jiang Yimei Wu Jiang(College of Resource and Environment Sciences,Jilin Agricultural University,Changchun 130118,China)
关键词：
Corn plant residue;Soil fulvic acid;Composition and structure
摘 要：
Spectroscopic measurement(Fourier transform infrared differential spectroscopy,Carbon-13 nuclear magnetic resonance spectrometry,Matrix-assisted laser desorption/ionization-time of flight mass spectrometry) and elemental analysis were performed of fulvic acids(FA) extracted from soils applied with corn plant residues.The results show that after corn plant residues were applied into the soil,C,H and N contents increased,O content decreased,and ratios of C/H,O/C and C/N all declined in soil FA.The carboxyl groups and aromatic carbon were comparatively lower,suggesting a low degree of oxidation and a low aromaticity of FA.Structural changes in soil FA showed a trend of becoming simpler in structure and smaller in molecule size.At the same time,amide,alkyl C and O-alkyl C contents increased significantly.Combining capacity of soil FA with inorganic minerals was getting weaker.Carboxylic groups in soil FA were turning from carboxylates into free carboxyls.Polysaccharide components in FA also increased.The changes in composition and structure of FA varied from treatment to treatment.
