Abstract The inorganic and organic components of soil carbon (C) constitute the largest C pool in the terrestrial biosphere. Determining changes in soil organic C (SOC) and inorganic C (SIC) under different climates is necessary for assessing C sequestration. The effects of arid, semiarid, and semihumid climates on SOC, SIC, and soil total C (STC) storage in 27 pedons along a soil climosequence were investigated. Results showed that SIC constituted 85%, 65%, and 74% of STC in the arid, semiarid, and semihumid regions, respectively, highlighting the importance of inorganic C in the C cycle. Soil organic C and SIC content and storage showed inverse trends with increasing soil depth. The mean content of STC storage in the semihumid region (113.12 Mg ha−1) was larger than in the semiarid (62.78 Mg ha−1) and arid (37.49 Mg ha−1) regions. The average times needed to store SIC in the semihumid, semiarid, and arid regions were estimated as 15,400, 23,100, and 26,000 years, respectively, suggesting that SIC is stored more rapidly in wetter climates because of more weathering.

中文翻译：

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干旱半湿润土壤中有机和无机碳的储存

摘要 土壤碳（C）的无机和有机成分构成了陆地生物圈中最大的碳库。确定不同气候下土壤有机碳 (SOC) 和无机碳 (SIC) 的变化对于评估碳固存是必要的。研究了干旱、半干旱和半湿润气候对 27 个土壤气候序列中 SOC、SIC 和土壤总碳 (STC) 储存的影响。结果表明，在干旱、半干旱和半湿润地区，SIC 分别占 STC 的 85%、65% 和 74%，突出了无机碳在碳循环中的重要性。随着土壤深度的增加，土壤有机碳和 SIC 含量和储存量呈相反趋势。半湿润地区（113.12 Mg ha-1）的平均STC 储存量大于半干旱（62.78 Mg ha-1）和干旱（37.49 Mg ha-1）地区。