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根据关中平原黄土地层岩溶作用产物的研究,可将该区500～10ka BP黄土地层岩溶作用分为北亚热带侵蚀-溶蚀型、湿暖湿润带强溶蚀-侵蚀型、温冷半湿润带中溶蚀-侵蚀型和温冷半干旱带弱溶蚀-侵蚀型4种。根据古土壤发育时岩溶作用垂向分带遗迹,可将前人划分的渗流带进一步分为上部非饱和循环强溶蚀亚带、中部过饱和循环沉淀亚带和下部不稳定循环弱溶蚀-弱沉淀亚带。3个亚带的划分对确定CO_2在垂向上的循环有重要指示意义。该区500～10ka BP可分为10个岩溶发育阶段,构成5个岩溶旋回,发展趋势是由强变弱。
Based on the study of karstification products of loess stratum in the Guanzhong plain, the karstification of the 500 ~ 10 ka BP loess stratum in this area can be divided into the northern subtropical erosion-erosion type, the wet-moist humid zone, the strong erosion-erosion type, the warm- Erosion-type and warm and cold semi-arid zone weak erosion-erosion type 4. According to the karstification vertical zonation of ancient soil development, the formerly divided seepage zones can be further divided into the upper unsaturated circulation strong erosion subzone, the middle supersaturated circulation sedimentary subzone and the lower unstable circulation weak erosion-weak precipitation Sub-belt. The division of the three sub-zones is of great importance in determining the vertical circulation of CO_2. The 500 ~ 10ka BP BP can be divided into 10 stages of karst development, forming 5 karst cycles, the trend of development is weakening.