Soil caco3 eluviation - illuviation is a relatively complicate process , soil co2 is one of the important effect factors , which influences soil caco3 through controlling soil ph value and caco3 solution capability 土壤碳酸钙淋溶淀积是一个复杂的过程，土壤中的co _ 2通过控制土壤ph值和碳酸钙的溶解性来影响土壤碳酸钙的淀积，是重要的影响因子之一。
2.
The distribution and change pattern of soil co2 concentration in soil profile data are analyzed as well as its effect factors . a model for soil caco3 eluviation - illuviation is developed based on mechanism of soil chemical thermodynamic principle and applying other modeling experience for reference 本文以砖窑沟流域为例研究和分析了土壤剖面co _ 2浓度的分布变化规律及其影响因子；对土壤碳酸钙淋溶锭积进行了定性、定量研究。
3.
Caco3 not only affects soil physical and chemical characteristics but also causes co2 change in the air , because caco3 is main components among the total pool of inorganic carbon of soil . this paper systematically summarized and analyzed general development characteristics of soil profile caco3 in loess hill gully area including source , content , forming - condition , distribution and illuviation - depth of caco3 , which will have the most important significance for the further studies on global soil and climate change 碳酸钙在土壤剖面中淀积的深度和类型是黄土高原土壤发育的重要标志，钙积层是黄土高原土壤发育环境的历史信息库，同时土壤碳酸钙作为土壤无机碳库重要组成，它通过溶蚀后再结晶与大气co _ 2之间进行物质交流来影响全球气候变化。
