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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Changes in the chemical composition of soil organic matter including water-soluble component during incubation: A case study of coniferous and broadleaf forest soils
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Changes in the chemical composition of soil organic matter including water-soluble component during incubation: A case study of coniferous and broadleaf forest soils

机译：孵育过程中水溶性组分的土壤有机物质化学成分的变化：针叶和阔叶林土的案例研究

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摘要

The objective of this study was to clarify what changes occurred in the amount and chemical properties of the soil organic matter (SOM) and dissolved organic matter (DOM) in the soil following isothermal incubation for 170 days. In this study, the soil samples were collected from coniferous and broadleaf forests in Toyama, Japan. The changes in the amount of carbon dioxide generation, the composition of the organic components of the SOM and its chemical properties during the incubation period were investigated. Likewise, DOM was extracted and examined for changes in chemical properties. For that purpose, pyrolysis-gas chromatography-mass spectrometry using tetramethylammonium hydroxide (TMAH-Py-GC/MS), absorption spectrophotometry, and fluorometry were used. From the amount of CO2 generated during incubation, it was found that 10%-15% of the SOM was mineralized. More CO2 was found to have been generated by the soil of the coniferous forests than by the soil of the broadleaf forests, probably because the former was more strongly affected by temperature changes. The DOM increased during the incubation period by day 55 and then sharply decreased. The absorption and fluorescence spectra showed that the DOM in the soil contained large amounts of humic substances after 97 days of incubation, which comprised organic compounds that did not readily decompose.
机译：本研究的目的是阐明在等温培养170天后，土壤中有机质（SOM）和溶解有机质（DOM）的数量和化学性质发生了什么变化。在这项研究中，土壤样本是从日本富山的针叶林和阔叶林中采集的。研究了在潜伏期内，SOM的二氧化碳生成量、有机成分组成及其化学性质的变化。同样，提取DOM并检查其化学性质的变化。为此，使用了四甲基氢氧化铵裂解气相色谱-质谱（TMAH-Py GC/MS）、吸收分光光度法和荧光测定法。从孵化过程中产生的二氧化碳量来看，发现10%-15%的SOM被矿化。研究发现，针叶林土壤产生的二氧化碳比阔叶林土壤产生的二氧化碳更多，这可能是因为前者受温度变化的影响更大。在第55天的潜伏期内，DOM增加，然后急剧下降。吸收光谱和荧光光谱表明，在培养97天后，土壤中的DOM含有大量腐殖物质，其中包括不易分解的有机化合物。

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