Applications of stable isotope ratio mass spectrometry in cattle dung carbon cycling studies.
Applications of stable isotope ratio mass spectrometry in cattle dung carbon cycling studies.
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稳定同位素比质谱在牛粪碳循环研究中的应用。
DOI：
10.1002/rcm.4332
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Dungait JA
中科院分区：
文献类型：
--
作者：
Dungait JA
由于植物源有机物（OM）的普遍存在，了解粪便碳（C）在土壤中的命运具有挑战性，而植物源有机物（OM）是粪便源有机物和土壤有机物（SOM）的主要来源。只有通过使用标记的粪便处理才能更好地了解这种大量OM来源的特定成分的命运，从而了解其对陆地生态系统中C循环的贡献。在这篇简短的综述中，我们考虑了使用大量和化合物特异性稳定碳同位素分析的分析方法，这些方法已用于探索土壤中粪便来源的C的命运。散装稳定的碳同位素分析，现在经常用来探索OM物质在土壤中的循环，并已表明，高达20%的应用粪肥C可能会被纳入到表层土壤层应用后几个星期，与高达8%的土壤剖面后一年。然而，整个土壤δ 13 C值代表了各种有机组分的平均值，这些有机组分具有不同的δ 13 C值和在土壤中的平均停留时间。几种稳定的13 C同位素比质谱方法已经被开发出来，用于定性和定量土壤和其他复杂基质中不同组分的有机质。特别是，热重-差示扫描量热-同位素比质谱（TG-DSC-IRMS）和气相色谱-燃烧-IRMS（GC-C-IRMS）分析已被应用于确定的合并和营业额的聚合物植物细胞壁材料从C4粪便到C3草原土壤使用天然丰度13 C同位素标记。这两种方法都表明，来自多糖，即作为纤维素或单糖组分的C的通量更类似于土壤中的大量粪便C比木质素的行为。然而，木质素及其4-羟基丙烷单体在土壤中出乎意料地动态。这些研究结果提供了进一步的证据，在土壤有机质动态的地球化学调查，挑战感知的概念，土壤中的碳库，这可能有深远的影响农业土壤的潜力，影响陆地碳汇的评估。版权所有© 2010约翰威利父子有限公司.
Understanding the fate of dung carbon (C) in soils is challenging due to the ubiquitous presence of the plant‐derived organic matter (OM), the source material from which both dung‐derived OM and soil organic matter (SOM) predominantly originate. A better understanding of the fate of specific components of this substantial source of OM, and thereby its contribution to C cycling in terrestrial ecosystems, can only be achieved through the use of labelled dung treatments. In this short review, we consider analytical approaches using bulk and compound‐specific stable carbon isotope analysis that have been utilised to explore the fate of dung‐derived C in soils. Bulk stable carbon isotope analyses are now used routinely to explore OM matter cycling in soils, and have shown that up to 20% of applied dung C may be incorporated into the surface soil horizons several weeks after application, with up to 8% remaining in the soil profile after one year. However, whole soilδ13C values represent the average of a wide range of organic components with varyingδ13C values and mean residence times in soils. Several stable13C isotope ratio mass spectrometric methods have been developed to qualify and quantify different fractions of OM in soils and other complex matrices. In particular, thermogravimetry‐differential scanning calorimetry‐isotope ratio mass spectrometry (TG‐DSC‐IRMS) and gas chromatography‐combustion‐IRMS (GC‐C‐IRMS) analyses have been applied to determine the incorporation and turnover of polymeric plant cell wall materials from C4dung into C3grassland soils using natural abundance13C isotope labelling. Both approaches showed that fluxes of C derived from polysaccharides, i.e. as cellulose or monosaccharide components, were more similar to the behaviour of bulk dung C in soil than lignin. However, lignin and its 4‐hydroxypropanoid monomers were unexpectedly dynamic in soil. These findings provide further evidence for emerging themes in biogeochemical investigations of soil OM dynamics that challenge perceived concepts of recalcitrance of C pools in soils, which may have profound implications for the assessment of the potential of agricultural soils to influence terrestrial C sinks. Copyright © 2010 John Wiley & Sons, Ltd.
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影响因子：
2.8
作者：
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影响因子：
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DOI：
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发表时间：
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影响因子：
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作者：
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