| 关松,窦森.添加玉米秸秆对黑土团聚体富里酸结构特征的影响[J].农业环境科学学报,2015,34(7):1333-1340. |
| 添加玉米秸秆对黑土团聚体富里酸结构特征的影响 |
| Structural Characteristics of Fulvic Acids from Aggregates of Black Soil Applied with Corn Stalks |
| 投稿时间：2015-02-22 |
| DOI：10.11654/jaes.2015.07.015 |
| 中文关键词: 富里酸 团聚体 傅里叶变换红外光谱 元素分析 热重分析 |
| 英文关键词: fulvic acid aggregates Fourier transformed infrared spectroscopy element analysis thermogravimetric analysis |
| 基金项目:国家自然科学基金项目(41171188);“973”国家重点基础研究发展计划项目(2011CB100503);吉林农业大学博士基金项目(201101) |
|
| 摘要点击次数: 2472 |
| 全文下载次数: 2460 |
| 中文摘要: |
| 运用元素分析、红外光谱及热重分析技术研究了培养条件下添加玉米秸秆对黑土及其大团聚体(>2000和2000~250 μm)、微团聚体(250~53 μm)和粉-粘粒组分(<53 μm)中富里酸(FA)结构特征的影响。结果表明,在对照(未添加玉米秸秆)土壤中,大团聚体FA分子的缩合度、氧化度和芳香性高于微团聚体和粉-粘粒组分。玉米秸秆的添加使全土FA分子的C、H、N含量增加,O含量下降,其C/H、O/C和C/N摩尔比值分别比对照减少了18.18%、17.92%和19.17%,高温失重/中温失重的比值低于对照51.85%,脂族碳/芳香碳的特征比值比对照增加了252.47%,大团聚体和微团聚体中FA分子的脂族碳/芳香碳特征比值比对照增加了34.86%~604.35%,表明玉米秸秆的添加使土壤FA分子的脂族性增强,缩合度、氧化度及芳香性下降。添加玉米秸秆土壤中,不同粒径团聚体相比,大团聚体FA分子的氧化度和芳香性高于微团聚体和粉-粘粒组分。与微团聚体、粉-粘粒组分相比,大团聚体FA在化学结构上芳香性较强;玉米秸秆的添加使黑土FA的结构趋于简单化。 |
| 英文摘要: |
| An incubation experiment was conducted to study the effects of corn stalk additions on the structure characteristics of fulvic acid(FA) extracted from the whole soil and the macroaggregates(>2000 and 2000~250 μm), microaggregates(250~53 μm) and silt-clay fractions(<53 μm) in black soil by using element analysis, thermogravimetric(TG) analysis and Fourier transformed infrared(FTIR) spectroscopy. Results showed that the degrees of aromaticity, condensation and oxidation were higher in FA from macroaggregates than from microaggregates and silt-clay fractions in the control soil(no corn stalks added soil). Addition of corn stalks increased content of carbon, hydrogen and nitrogen, but decreased oxygen content in FA from the whole soil. Compared with the control soil, the molar ratios of carbon to hydrogen(C/H), oxygen to carbon(O/C), and carbon to nitrogen(C/N) of FA from corn stalks-treated soil reduced by 18.18%, 17.92%, and 19.17%, respectively, whereas the ratio of aliphatic carbon to aromatic carbon(aliphatic-C/aromatic-C) increased by 252.47%. The ratio of mass-lost at high temperature to medium temperature of FA was 51.85% lower in corn stalk treated soil than in the control soil. The aliphatic-C/aromatic-C ratios in FA from macroaggregates and microaggregates in corn stalk treated soil were 34.86%~604.35% more than those from the control soil. The aliphaticity of FA in whole soil increased, whereas the degrees of aromaticity, condensation and oxidation all decreased after corn stalk addition. For aggregate fractions, the degrees of aromaticity and oxidation were higher in FA from macroaggregates than those from microaggregates and silt-clay fractions after applying corn stalk to soil. Overall, FA from macroaggregates was more aromatic than that from microaggregates and silt-clay fractions. These results indicate that addition of corn stalks would make the FA structure become simpler in black soil. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
