摘要
采用傅里叶变换红外光谱(FTIR)对玉米秸秆腐解过程进行了研究。由光谱变化的分析可见,随着腐解的进行,羟基、酮羰基、甲基、亚甲基和次甲基的含量逐渐降低,腐解产物的脂族性降低,芳香性趋于升高和增强,有机成分中的无机元素特别是硅释放出来,并以SiO2等氧化物的形式逐渐积累,一些阳离子则形成羧酸盐和碳酸盐。羧基在腐解过程中皆形成羧酸盐。就秸秆中叶片和茎秆腐解变化的差异来说,叶片腐解产物中甲氧基的含量增加,茎秆中的甲氧基含量无明显变化。在腐解180天后,叶片中的有机硅化合物及木质素的分解显著,但茎秆中二者的变化较小。未腐解的叶片中无羧酸盐存在,而未腐解的茎秆中则存在羧酸盐。N肥的加入促进了玉米秸秆残体的腐解。叶片和茎秆混合堆腐的腐殖化系数远高于二者单独堆腐。
Fourier transform infrared
spectroscopy (FTIR) was directly applied to study thedecomposition process of corn straw
residue (CSR). The result showed that FTIRspectra could indicate the dynamic changes of
organic components during thedecomposition process of CSR With the progress of CSR
decomposition, hydroxyl,ketonic carbonyl, methyl, methylene, methine and aliphatic
compounds decreased, butaromatic compounds increased. This meant that the carbohydrates
and aliphaticcompounds decomposed quickly and lignin decomposed slowly. The inorganic
elements,especially silicon, were reduced from the CSR and accumulated as oxides and
someother inorganic elements were reacted with carboxyls to form carboxylates. In theprocess
of decomposition, carboxyl existed as carboxylic ions, most carbohydrates andaliphatic
compounds were oxidized to CO2 and H2O, the proteins and amino acidswere decomposed to
CO2, NH+4 NO-3 and amides, and the lignin were decomposedto hydroquinones. As far as the
differences between the leaf and the stem during thedecomposition process of CSR, methoxy
increased in the leaf, however, no significantchanges were observed in the stem; the organic
silicon compounds and lignindecomposed significantly in the leaf, but the change was little in
the stem;undecomposed leaf didn' t contain carboxylic ions, on the contrary, carboxylic
ionsexisted in undecomposed stem. During the decomposition process of CSR, addition ofN
fertilizer promoted the decomposition progress of CSR The chemical analysesshowed that the
humification index when the leaf and stem were mixed anddecomposed was higher than that
when the leaf and stem were decomposed separately.
出处
《土壤学报》
CAS
CSCD
北大核心
1999年第1期91-100,共10页
Acta Pedologica Sinica
关键词
玉米秸秆
FTIR光谱
腐解过程
FTIR spectroscopy, Corn straw
residue (CSR), Decompositionprogress.