引用本文:陈晓东,吴景贵,李建明,范 围,李晓航,朱文悦.有机物料施用下原生盐碱土胡敏酸结构特征[J].土壤学报,2020,57(3):702-709. DOI:10.11766/trxb201904030131
CHEN Xiaodong,WU Jingguii,LI Jianming,FAN Wei,LI Xiaohang,ZHU Wenyue.Structural Characteristics of Humic Acid in Primary Saline-alkali Soil as Affected by Application of Organic Materials[J].Acta Pedologica Sinica,2020,57(3):702-709. DOI:10.11766/trxb201904030131
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有机物料施用下原生盐碱土胡敏酸结构特征
陈晓东, 吴景贵, 李建明, 李晓航, 朱文悦
吉林农业大学资源与环境学院
摘要:
为研究不同有机物料对原生盐碱土胡敏酸官能团组成的影响,以吉林省大安市原生盐碱地为研究对象,设置空白处理(CK)、颗粒状秸秆处理(KL)、正常玉米秸秆处理(JG)、牧草处理(MC)和羊粪处理(YF),通过红外光谱与主成分分析(Principal component analysis, PCA )相结合,研究不同有机物料施用下土壤胡敏酸红外光谱特征。结果表明,有机物料各处理与CK处理相比增加了土壤胡敏酸中脂肪碳和芳香碳的相对含量,减少了羧基碳的含量。除KL处理外,其他处理均增加了土壤胡敏酸中氨基化合物的相对含量。同时有机物料的施用增加了土壤胡敏酸的脂族碳/羧基碳和脂族碳/芳香碳比值,表征有机物料的施用使得土壤胡敏酸结构缩合度和氧化度下降,脂族性增强,芳香性降低,胡敏酸结构趋于脂族化、简单化、年轻化。对比两种秸秆处理,发现KL处理更有利于土壤新形成结构年轻化、简单化、脂族性强的胡敏酸分子。根据PCA结果,有机物料的施用是土壤中脂族性碳、芳香族碳以及氨基化合物的主要来源之一,为探讨胡敏酸官能团的来源提供依据。通过红外光谱结合PCA,发现了土壤胡敏酸官能团组成对有机物料的不同响应,为研究有机物料的施用对土壤胡敏酸性质的影响机制提供理论依据。
关键词:  有机物料种类  有机物料形态  土壤胡敏酸  红外光谱  主成分分析
基金项目:吉林省科技发展计划项目(20190301018NY)和国家重点研发计划项目(2018YFD0300203,2017YFD0201801)共同资助
Structural Characteristics of Humic Acid in Primary Saline-alkali Soil as Affected by Application of Organic Materials
CHEN Xiaodong, WU Jingguii, LI Jianming, LI Xiaohang, ZHU Wenyue
College of Resources and Environmental Sciences, Jilin Agricultural University
Abstract:
【Objective】This study aimed at exploration of effects of application of organic materials on composition of humic acid functional groups in primary saline-alkali soils.【Method】A field experiment was carried out in a field of original saline-alkali soil in Da""an City, Jilin Province. The experiment was designed to have CK and four treatments, that is, CK (control without application of any organic material), Treatment KL (application of granular straw), Treatment JG (application of normal corn stalk), Treatment MC (application of forage grass), and Treatment YF (application of sheep manure). Humic acids extracted from the soil of each treatment were analyzed with a fourier transform infrared spectroscopy (FTIR) and the principal component analysis technique and infrared spectra obtained were characterized relative to treatment. 【Result】Results show that the treatments increased the relative content of fatty carbon and aromatic carbon in soil humic acid, but reduced the content of carboxyl carbon as compared with CK. With the exception of KL, all the treatments increased the relative content of amino compounds in soil humic acid. In addition, all the treatments increased the ratios of aliphatic carbon/carboxyl carbon and aliphatic carbon/aromatic carbon in soil humic acid, which indicates that the application of organic materials reduces the structural condensation degree and oxidation degree of soil humic acid, while enhancing aromaticity. The structure of humic acid also tended to be aliphatic, simple, and young. Comparison between KL and JG shows that KL was higher than JG in relative content of aliphatic carbon in humic acid, but lower in relative content of carboxy-carbon and aromatic carbon in humic acid. Furthermore, JG increased the relative content of amino compounds in soil humic acid, while KL slightly reduced it. Judging from the ratio of I2920/I1720 and I2920/I1620 in humic acid, KL treatment is more conducive to formation of humic acid, younger, simpler and more aliphatic in structure in the soil. The principal component analysis indicates that the applied organic materials are one of the main sources of aliphatic carbon, aromatic carbon and amino compounds in soil, which provides a basis for exploring sources of humic acid functional groups. Via FTIR infrared spectroscopy, it was found that soil humic acid functional groups varied in composition with treatment or type of the organic material applied. This provided a theoretical basis for studying mechanism of the application of organic materials affecting humic acid properties in the soil.【Conclusion】In summary, the applied organic materials are one of the major sources of aliphatic carbon, aromatic carbon and amino compounds in the soil. As affected by the application, humic acid in the soil was lowered in structural condensation degree, oxidation degree and aromoticity, while enhanced in aliphaticity. Consequently the humic acid tended to be aliphatic, simple, and youngin structure. The effects on composition of humic acid in the soil varied with treatment or type of the organic material applied. As such, granulated straw is more conducive to the formation of humic acid, younger, simpler and more aliphatic in structure in the soil.
Key words:  Organic material types  Organic material forms  Soil humic acid, Infrared spectrum  Principal component analysis (PCA)