發(fā)布時間：2018-03-02 13:46

  本文選題：胡敏酸　切入點(diǎn)：結(jié)構(gòu)變化　出處：《光譜學(xué)與光譜分析》2017年09期 　論文類型：期刊論文

【摘要】：該研究主要探討不同退化程度和人工恢復(fù)方式對草原土壤胡敏酸結(jié)構(gòu)的變化特征,為退化草原恢復(fù)提供理論依據(jù)。在鄂爾多斯沙地不同退化樣地與人工恢復(fù)草地,對草原土壤的腐殖酸進(jìn)行了分離提取,采用元素分析、~(13)核磁共振(NMR)等方法對荒漠草原土壤退化與恢復(fù)過程中土壤胡敏酸(HA)不同官能團(tuán)的含量變化進(jìn)行分析,并用因子分析法研究它們的結(jié)構(gòu)特征和差異。結(jié)果表明:不同退化及恢復(fù)階段HA碳骨架相似,但各類碳原子(官能團(tuán))的含量不同,芳香族和脂肪族結(jié)構(gòu)在胡敏酸結(jié)構(gòu)中發(fā)揮了重要作用。退化階段,土壤HA的芳香碳減少,碳水化合物減少,土壤HA的氧化程度增加,疏水程度降低。恢復(fù)階段土壤芳香碳含量增加,碳水化合物含量增加,疏水程度略有降低。土壤退化及恢復(fù)階段,胡敏酸(HA)的結(jié)構(gòu)變化最大的部分是芳香碳、取代脂肪碳結(jié)構(gòu),其次是羧基和酯基碳和未取代脂肪碳結(jié)構(gòu)。植被恢復(fù)對腐殖酸結(jié)構(gòu)的變化有重要的影響,本氏針茅區(qū)和本氏針茅+油蒿區(qū)的HA結(jié)構(gòu)中芳香化程度和復(fù)合程度較高,氧化程度低。圍欄樣區(qū)內(nèi)土壤胡敏酸(HA)的酸度相對較高,芳香化程度和復(fù)合程度仍然較低。因此,土壤胡敏酸結(jié)構(gòu)特征的變化可以反映草原土壤的退化程度,進(jìn)一步揭示草原土壤退化的機(jī)制。
[Abstract]:In this study, the variation characteristics of Hu Min acid structure in grassland soil with different degree of degradation and artificial restoration were studied, which provided theoretical basis for restoration of degraded grassland. Different degraded plots and artificial restoration of grassland in sandy land of Ordos were studied. The humic acid in steppe soil was isolated and extracted. The content changes of different functional groups of soil Hu Min acid in the course of soil degradation and restoration in desert steppe were analyzed by elemental analysis and nuclear magnetic resonance (NMR). The structural characteristics and differences of HA were studied by factor analysis. The results showed that HA carbon skeleton was similar in different degradation and restoration stages, but the content of various carbon atoms (functional groups) was different. Aromatic and aliphatic structures play an important role in the acid structure of Hu Min. In the degradation stage, the aromatic carbon and carbohydrate of soil HA decrease, and the degree of oxidation of soil HA increases. The content of aromatic carbon increased, the content of carbohydrates increased and the degree of hydrophobicity decreased slightly in the recovery stage. In the stage of soil degradation and restoration, the most important part of the structural changes was aromatic carbon, which replaced the fatty carbon structure. Secondly, carboxyl and ester carbon and unsubstituted fatty carbon structure. Vegetation restoration has an important influence on the changes of humic acid structure. The aromatization degree and compound degree of HA structure in Stipa bungeana area and Artemisia Bungei oil area are higher. The acidity of soil Hu Min is relatively high, the degree of aromatization and the degree of compounding are still low in the fenced area. Therefore, the change of the acid structure characteristics of soil Hu Min can reflect the degree of grassland soil degradation. Further reveal the mechanism of grassland soil degradation.
【作者單位】： 中國農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院;沈陽農(nóng)業(yè)大學(xué)農(nóng)學(xué)院;
【基金】：the planning subject of“the twelfth five-year plan”in national science and technology for the rural development in China(2012BAD14B01-1)
【分類號】：S812.2

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