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以重庆地区紫色土为对象,研究了重庆地区酸性紫色土Zn有效性及主要影响因素。结果表明:供试紫色土全Zn含量为40.2～89.6mg/kg,有效Zn含量在0.2～4.2mg/kg之间;用直线、幂函数和指数函数回归方程对影响有效Zn的主要土壤因素进行回归拟合,土壤有效Zn与土壤全Zn、有机质、全N含量呈极显著正相关关系,相关系数依次为0.5243**、0.5308**、0.5097**;而与全P含量相关性显著(r=0.4637*);与土壤pH值呈极显著负相关关系(r=-0.5698**);通径分析表明,土壤理化性质对有效Zn的直接作用系数大小次序为全Zn>全N>pH,土壤全Zn对Zn有效性的直接作用最为明显。
Taking purple soil in Chongqing as an example, the Zn availability and main influencing factors of acid purple soil in Chongqing area were studied. The results showed that the total Zn content of the purple soil was 40.2-89.6mg / kg and the effective Zn content was between 0.2-4.2mg / kg. The main soil factors affecting the effective Zn were linear regression, power function and exponential regression equation Regression fitting showed that there was a significant positive correlation between soil available Zn and total Zn, organic matter and total N in soil, with the correlation coefficients of 0.5243 **, 0.5308 ** and 0.5097 ** in turn, but significant correlation with total P (r (R = -0.5698 **). The path analysis showed that the order of direct acting coefficient of soil physical and chemical properties to available Zn was total Zn> total N> pH, The direct effect of soil Zn on Zn availability is the most obvious.