摘 要：
用核磁共振波谱法研究了施入玉米秸秆和根茬后土壤胡敏酸(HA)的变化。结果表明,玉米植株残体施用后,土壤HA的烷基链变短且多分支;土壤HA的芳香度降低,芳香碳减少,而烷基碳和烷氧碳增加,HA的脂肪族特性增强,氧化程度降低;发生变化最大的时期在施入玉米植株残体60d左右,且玉米秸秆对土壤胡敏酸的影响要大于根茬的影响。
译 名：
Effects of Corn Plant Residues on the Soil Humic Acids by Nuclear Magnetic ResonanceSpectrometry
作 者：
WU Jing-gui, WANG Ming-hui, JIANG Yi-mei, WU Jiang (College of Resource and Environment Sciences, Jilin Agricultural University, Changchun 130118, China)
关键词：
corn plant residue; soil humic acid; nuclear magnetic resonance spectrometry
摘 要：
Reclaiming of the corn plant residues (CPR) has been taken as an important method to improve soil in many areas of China. In order to investigate the mechanism of CPR improving soil, the effects of CPR on the soil humic acids (HAs) were studied by nuclear magnetic resonance spectrometry in the black soil with incubation experiment. The CPR were divided into corn stalk residues (CSR) and corn root residues (CRR). The HAs were extracted from the soils applied with CSR and CRR at various stages after incubation. The results showed that the methylene chains became shorter and branch chains increased in the soil humic acids after CPR were applied into the soil. The aromaticity and the aromatic C content of soil HAs reduced, while, the contents of alkyl-C and carbohydrate-C increased. The aliphatic characteristics of the soil HAs were more significant. The application of CPR led to the increase in aliphatic components of soil HAs, the decrease in aromatic components of the soil HAs and the inhibition in oxidation degree of the soil HAs. The peak of the above changes appeared at the 60th day after applying CPR. The effects of CSR on the soil HAs were greater than that of CRR.
