Dynamics of organic matter in soil as determined by variations in 13C/12C isotopic ratios and fractionation by ease of oxidation
Dynamics of organic matter in soil as determined by variations in 13C/12C isotopic ratios and fractionation by ease of oxidation
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DOI：
10.1071/s96107
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发表时间：
1997
期刊：
影响因子：
1.6
通讯作者：
A. Conteh;R. Lefroy;G. Blair
中科院分区：
文献类型：
--
作者：
A. Conteh;R. Lefroy;G. Blair
土壤有机质的管理需要能够准确监测短期和长期土壤有机质变化的技术。这项研究是在温室盆栽实验中进行的，利用有机材料的 13C/12C 同位素比的变化以及通过氧化的难易程度进行分馏，研究在长期耕作、植物残留和肥料施用的影响下土壤碳的变化。该研究考察了不同种植历史的邻近土壤样品碳含量的变化，受化肥和农作物残留物的施用以及小麦生长的影响。施用残渣后观察到土壤碳值显着增加。施肥对土壤碳水平的影响取决于小麦的存在与否。原生土壤中的活性碳含量高于耕种土壤。
Management of organic matter in soils requires techniques that accurately monitor changes in soil organic matter over the short term and long term. This study was carried out in a glasshouse pot experiment to examine changes in soil carbon under the influence of long-term cropping, plant residue, and fertiliser application, using variations in 13C/12C isotopic ratios of organic materials and fractionation by ease of oxidation. The study examines the changes in carbon contents of adjacent soil samples with different cropping histories as affected by application of fertiliser and crop residue and the growth of wheat. Significant increases in soil carbon values were observed with residue application. The effects of the applied fertiliser on soil carbon levels depend on the presence or absence of wheat. A higher amount of labile carbon was found in the native soil than in cultivated soil.