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为探明川中丘陵分布广泛的石灰性紫色土的缺Ｚｎ机理，应用化学连续浸提法对３０个样本提取了８种形态的Ｚｎ，采用最优组合变量回归分析和相关分析对数据进行处理．结果表明，石灰性紫色土中各形态Ｚｎ的分配差异显著；土壤ｐＨ、质地、有机质、碳酸盐对Ｚｎ的分布起着不同程度的作用，特别是碳酸盐，不仅间接增强土壤氧化物和粘土矿物对Ｚｎ的吸附，其本身对Ｚｎ的吸附和固定作用（占全Ｚｎ２．７０％）较为重要．土壤ｐＨ、有机质是影响有效态Ｚｎ的主要因素
In order to find out the mechanism of Zn deficiency in calcareous purple soil with wide distribution in central Sichuan Basin, eight forms of Zn were extracted from 30 samples by chemical continuous extraction method. The data were processed by the regression analysis and correlation analysis of the optimal combination variables. The results show that there are significant differences in the distribution of Zn in calcareous purple soil. Soil pH, texture, organic matter and carbonate play different roles in the distribution of Zn. In particular, carbonate not only indirectly increases soil oxides and The adsorption of Zn by clay minerals is more important for the adsorption and fixation of Zn (accounting for Zn 2.70%). Soil pH and organic matter are the main factors affecting the effective Zn content