豫西地区有效态Zn含量分布特征及其影响因素

Influencing Factors and Distributing Characteristics of Soil Available Zn in the Western Henan Province

采用野外采样结合室内分析的方法,研究了豫西地区有效Zn的分布特征及其影响因素,以期为锌肥的施用提供依据。结果表明,豫西地区土壤全Zn含量介于63.437～164.675mg/kg,平均81.483mg/kg,有效Zn含量介于0.272～7.020mg/kg,平均1.147mg/kg,表现为山地<丘陵<平原。土壤有效Zn与全Zn、海拔高度、全N、速效磷、有机质呈极显著正相关,相关系数依次为0.558、0.201、0.291、0.296、0.222,与pH值呈显著负相关关系,相关系数为0.116;有效Zn与全Zn、pH值的关系用直线方程可以较好拟合,有效Zn与有机质、全N、速效P的关系可用幂函数拟合,有效Zn与海拔高度的关系宜用指数函数拟合;通径分析表明,各因子对有效Zn的影响程度大小顺序为海拔>全N>速效P>pH值>有机质,海拔对Zn有效性的作用最为明显。

Influencing factors and distributing characteristics Henan province were studied. Results showed that, total soil of soil available Zn in the western Zn was mostly within the range of 63. 437--164. 675 mg/kg,with an average of 81. 483 mg/kg,and available Zn was mostly within the range of 13. 272 -7. 020 mg/kg,with an average of 1. 147 mg/kg. Soil available Zn increased in the sequence of mountain〈hill〈plain. For the soil in the western Henan province,a significantly positive correlation was found between soil available Zn and total Zn, altitude, total nitrogen, available phosphorus, and organic matter, and the correlation coefficients were 0. 558, 0. 201, 0. 291,0. 296,0. 222, respectively. A significantly negative correlation existed between soil pH and available Zn with a correlation coefficient of 0. 116. Linear functions fitted the relationships better between available Zn and total Zn or pH. Power functions fitted the relationships better between available Zn and organic,total nitrogen,available phosphorus. The relationship between soil avai- lable Zn and height could be expressed by an exponential function. The results of path analysis in- dicated that the direct acting coefficient of soil chemical and physical factors on soil available Zn was in the following order： altitude 〉 total nitrogen 〉 available phosphorus 〉pH 〉organic. The contents of soil available Zn were mainly affected by altitude.