美国西南荒漠土壤中CaCo_3累积的速率研究表明,在非石灰质土壤中,Ca的来源有雨水,尘土及含Ca矿物的化学风化。大多数研究西南荒漠中CaCo_3形成的学者相信发育在石灰质母质土壤中Ca的主要来源是雨水和尘土。本文是对前人大量研究的总结和深入讨论,译文由于篇幅所限,仅摘录以下内容,有关详细讨论请见原文。 Studies on the rate of accumulation of CaCo_3 in the desert soil of Southwest USA show that the sources of Ca are chemical weathering of rainwater, dust and Ca-bearing minerals in non-calcareous soils. Most scholars who study the formation of CaCo_3 in the desert of the southwest believe that the major sources of Ca in the limestone parent soil are rainwater and dust. This article is a summary and in-depth discussion of a large number of predecessors’ studies. Due to limited space, the article only extracts the following contents. For the detailed discussion, please see the original text.