Evaluation of carbon mineralization and structural alterations of organic carbon in high-moor peat soils during incubation
Evaluation of carbon mineralization and structural alterations of organic carbon in high-moor peat soils during incubation
复制标题
高沼泥炭土培育过程中碳矿化和有机碳结构变化的评价
DOI：
10.1007/s11368-020-02637-9
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发表时间：
2020
影响因子：
3.6
通讯作者：
Hideki Kuramitz
中科院分区：
文献类型：
--
作者：
Kazuto Sazawa;Daiki Kubota;Hironori Yoshida;Noriko Hata;Naoya Wada;Hideki Kuramitz
目的湿地和泥炭地土壤有机质的数量和质量对于评价环境变化的影响具有重要意义。本研究的目的是评估在恒温培养过程中的高沼地泥炭土的有机质和溶解性有机质（DOM）的化学性质的变化在两种植被类型下。材料和方法高沼地泥炭土从沼泽植被和矮竹收集培养进行了108天，在每个温度为25 °C和35 °C。采用四甲基氢氧化铵热化学-气相色谱-质谱联用（TMAH-GC/MS）和荧光分析法，对培养过程中土壤碱抽提物和DOM的化学性质进行了分析。在35 °C培养过程中，矮竹土壤DOM中植物和微生物残留量在培养初期显著增加。另一方面，在沼泽植被土壤样品中的DOM的组成没有显着变化之间的孵化在每个温度。荧光光谱分析表明，在较高的温度下，矮竹土壤中的类蛋白质荧光DOM被微生物消耗，促进了类胡敏素荧光DOM的淋溶和碳的矿化。研究表明，土壤DOM性质的评价可以用于评估气候变化对土壤环境的影响。
PurposeThe quantity and quality of soil organic matter (SOM) in the wetlands and peatlands are important for evaluating of the effects of environmental changes. This study’s aim was to evaluate the change in the chemical properties of SOM and dissolved organic matter (DOM) during a constant temperature incubation of high-moor peat soil under two types of vegetation.Materials and methodsIncubation of high-moor peat soils collected from marsh vegetation and dwarf bamboo was conducted for 108 days at each temperature of 25 °C and 35 °C. The chemical properties of alkaline extract and DOM in soil samples during incubation were analyzed by tetramethylammonium hydroxide thermochemolysis-gas chromatography-mass spectrometry (TMAH-GC/MS) and fluorescence analysis.Results and discussionThe cumulative CO2emission from peat under dwarf bamboo was higher than that of peat under marsh vegetation. During incubation at 35 °C, plant and microbial residues in DOM extracted from dwarf bamboo soil were increased significantly at the early stages of culture. On the other hand, the components of DOM in the marsh vegetation soil sample did not significantly change between incubation at each temperature. The fluorescence spectra showed that protein-like fluorescent DOM contained in dwarf bamboo soil is consumed by microorganisms, which promotes leaching of humic-like fluorescent DOM and carbon mineralization during the incubation period at a higher temperature.ConclusionsCompared with marsh vegetation soil, the DOM in dwarf bamboo soil is susceptible to temperature rises and can be a larger source of CO2emissions. This study shows that evaluation of DOM properties in soil could be useful to assess the effect of climate change on soil environment.