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首页> 外文期刊>Geochemical Journal >Dissolved organic carbon and its carbon isotope compositions in hill slope soils of the karst area of southwest China: Implications for carbon dynamics in limestone soil
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Dissolved organic carbon and its carbon isotope compositions in hill slope soils of the karst area of southwest China: Implications for carbon dynamics in limestone soil

机译：西南喀斯特地区山坡土壤中溶解有机碳及其碳同位素组成：对石灰岩土壤碳动态的影响

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摘要

Dissolved organic carbon (DOC) can be considered fine indicators of soil quality that influence soil function in specific ways and are very sensitive to changes in soil management practices. In this study, the contents and isotopic compositions of dissolved organic carbon (δ~(13)C_(doc)) in soils were analyzed at different topographic positions on two typical slopes in a karst area to evaluate the source and fate of DOC in the soil from these regions. The results show that DOC contents of the two slopes were mainly affected by soil organic matter (SOM) input, topography, and soil quality. DOC contents at each topographic location on the two slopes decrease with increasing soil depth. The δ~(13)C_(DOC) of the shrubby slope surface soils varied from -15.1‰ to -22.1‰,and are consistent with SOM δ~(13)C and local vegetation. The δ~(13)C_(DOC) of the grassy slope surface soils ranged from -20.0‰ to -20.9‰, similar to isotopic compositions of soil organic carbon (δ~(13)C_(doc)), but are inconsistent with present-day vegetation. The δ~(13)C_(DOC) varied significantly with depth at each topographic location. Thus,the dependence of δ~(13)C_(doc) in soil profiles on depth reflects the migration and transforrpation of DOC in soils.
机译：溶解有机碳（DOC）可被视为土壤质量的优良指标，它以特定方式影响土壤功能，并且对土壤管理实践的变化非常敏感。在这项研究中，分析了喀斯特地区两个典型斜坡上不同地形位置土壤中溶解有机碳（δ〜（13）C_（doc））的含量和同位素组成，以评估土壤中DOC的来源和结局。这些地区的土壤。结果表明，两个斜坡的DOC含量主要受土壤有机质输入，地形和土壤质量的影响。随着土壤深度的增加，两个斜坡上每个地形位置的DOC含量都会减少。灌木状坡面土壤的δ〜（13）C_（DOC）变化范围为-15.1‰至-22.1‰，与SOMδ〜（13）C和局部植被相吻合。草地坡面土壤的δ〜（13）C_（DOC）范围为-20.0‰至-20.9‰，与土壤有机碳的同位素组成（δ〜（13）C_（doc））相似，但与现今的植被。在每个地形位置，δ〜（13）C_（DOC）随深度而变化很大。因此，土壤剖面中δ〜（13）C_（doc）对深度的依赖性反映了DOC在土壤中的迁移和转化。

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