Soil carbonates are dominantly present in dryland Critical Zone (CZ) and their formation could lead to important long-term carbon sequestration in arid to semiarid soils if the Ca ions were derived from silicate weathering or other non-carbonate sources. In managed CZ systems such as agricultural areas converted from natural drylands, irrigation has profound effects on the dryland CZ inorganic carbon storage, especially by modifying dissolution and precipitation dynamics of soil carbonates via controls of irrigation intensity and water chemistry, soil properties, and hydrological flow paths. These processes could lead to transformation of inorganic carbon in soils and groundwater aquifers underneath drylands. One key knowledge gap in studying soil carbonates from managed dryland CZ systems is to detect the formation of soil carbonates under irrigated conditions and distinguish them effectively from soil carbonates formed under natural conditions.

中文翻译：

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旱地关键区土壤碳酸盐中的铀系和锶同位素系统学：对土壤无机碳储存和转化的影响


土壤碳酸盐主要存在于旱地临界区 (CZ)，如果 Ca 离子来自硅酸盐风化或其他非碳酸盐来源，它们的形成可能会导致干旱至半干旱土壤中重要的长期碳固存。在管理的直带系统中，例如由自然旱地转变为农业区，灌溉对旱地直带无机碳储存具有深远的影响，特别是通过控制灌溉强度和水化学、土壤性质和水文流量来改变土壤碳酸盐的溶解和降水动态。路径。这些过程可能导致旱地下方土壤和地下水含水层中无机碳的转化。研究管理旱地 CZ 系统的土壤碳酸盐的一个关键知识差距是检测灌溉条件下土壤碳酸盐的形成，并将其与自然条件下形成的土壤碳酸盐有效地区分开。