Soil organic carbon
Soil organic carbon
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DOI：
10.24215/16699513e053
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
María Paz Salazar;Rafael Villarreal;L. A. Lozano;María Florencia Otero;N. Polich;G. Bellora;C. G. Sor
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文献类型：
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作者：
María Paz Salazar;Rafael Villarreal;L. A. Lozano;María Florencia Otero;N. Polich;G. Bellora;C. G. Sor
土壤有机碳是土壤质量诊断的重要指标。土壤有机碳的物理和化学分馏是有用的，以表征土壤有机碳，因为一些馏分是更敏感的指标，不同的管理措施的影响。本研究的目的是（i）确定阿根廷潘帕斯草原Argiudoll在NT下不同深度和位置的SOC值和SOC的不同组分，（ii）确定SOC物理和化学组分之间的关系。在位于Chascomús的实验区，我们测定了SOC含量、腐殖酸（HA）、富里酸（FA）、胡敏素、不同深度、行内和行间的粗颗粒和细颗粒有机碳（POCc和POCf）以及矿物相关有机碳（MOC）。土壤有机碳含量、各有机碳组分含量以及各组分对土壤有机碳的贡献均表现出垂直变化。HA和POCc（更新和更不稳定的组分）对SOC的贡献在表层大于深层，而胡敏素（老化和更不稳定的组分）对SOC的贡献随深度增加而增加，FA、POCf和MOC对SOC的贡献相对稳定。土壤有机碳含量和组成不存在行与行间效应。FA含量与POCc相关，HA含量与POCc、POCf相关，胡敏素与MOC相关。
Soil organic carbon (SOC) is an important factor for soil quality diagnosis. Physical and chemical fractionation of SOC are useful to characterize SOC, because some fractions are more sensitive indicators of the effects of different management practices. The aims of this study were (i) to determine values of SOC and different fractions of SOC at different depths and positions in an Argiudoll of the Argentinian Pampas under NT, and (ii) to determine the relation between physical and chemical fractions of SOC. In an experimental plot located in Chascomús, we determined SOC content, humic acids (HA), fulvic acids (FA), humins, coarse and fine particulate organic carbon (POCc and POCf) and mineral associated organic carbon (MOC), at different depths and in the row and inter-row. The content of SOC and different SOC fractions, as well as the contribution of each fraction to SOC showed a vertical variation. The contribution of HA and POCc (newer and more labile fractions) to SOC was larger in the surface than in deeper layers, while humins’ (older and more recalcitrant fraction) contribution to SOC increased with depth, and the contribution of FA, POCf and MOC to SOC remained relatively constant. There was no effect of row and inter-row in SOC content and composition. FA content was correlated to POCc, HA content to POCc and POCf and humins to MOC.