绿洲盐化潮土有效锌含量与盐分离子的相关性及通径分析

发布时间：2018-06-06 13:08

本文选题：绿洲盐化潮土 + 有效锌含量　；参考：《土壤》2017年03期

【摘要】：以张掖市甘州区和临泽县绿洲盐化潮土为研究对象,通过采集具有代表性、正常耕作种植、前茬为玉米的典型地块0~20 cm耕层土样分析化验,研究了区域土壤有效锌和盐分离子含量特征,运用通径分析方法研究了它们之间的相关性及不同盐分离子对土壤有效锌含量的影响程度。结果表明,河西绿洲灌区盐化潮土有效锌含量介于0.289~0.736 mg/kg之间,平均为0.473 mg/kg,变异系数为18.68%,超过70%的土壤低于缺锌临界值(0.5 mg/kg),且土壤有效锌含量有随含盐量升高而降低的趋势。土壤有效锌含量与HCO_3~ 、Mg~(2+)、Na~+含量之间呈极显著负相关,与Cl~ 、Ca~(2+)、K~+含量之间呈显著负相关,与SO_4~(2 )含量之间的相关性不显著。Mg~(2+)对土壤有效锌含量表现出强烈的直接和间接负效应,HCO_3~ 表现出很大的直接负效应和强烈的间接正效应,Cl~ 、K~+和Na~+均表现出较强的直接和间接负效应,SO_4~(2 )表现出较弱的直接和间接正效应,Ca~(2+)表现出较弱的直接和间接负效应。Mg~(2+)、HCO_3~ 和Na~+是影响土壤有效锌含量变化的3个主导因素,对决定系数R~2的贡献超过了68%。
[Abstract]:Taking the salinized tidal soil in Ganzhou district and Linze county of Zhangye city as the research object, the soil samples of 0 ~ 20 cm topsoil layer in the typical plot of maize were collected, cultivated and planted under normal tillage. The characteristics of available zinc and salt ions in regional soil were studied. The correlation between them and the influence of different salt ions on available zinc content were studied by path analysis. The results showed that the available zinc content of salinized tidal soil in Hexi oasis irrigation area was between 0.289 ~ 0.736 mg/kg, with an average of 0.473 mg / kg, and the coefficient of variation was 18.68. The soil content of over 70% was lower than the critical value of zinc deficiency (0.5 mg / kg 路kg ~ (-1), and the soil available zinc content decreased with the increase of salt content. There was a significant negative correlation between available zinc content in soil and the content of HCO _ 3, mg ~ (2 +) and Na ~ (2 +), and there was a significant negative correlation between the content of available zinc and the content of Cl ~ (2 +). The correlation between HCO3 and SO_4~(2 content is not significant. 2) there is a strong direct and indirect negative effect on soil available zinc content and strong direct negative effect and strong indirect positive effect on soil available zinc content. The direct and indirect negative effects of so _ 4 and Na ~ (2 +) showed weak direct and indirect positive effects. (2) the direct and indirect negative effects were weak. The direct and indirect negative effects of HCO3 and Na ~ were three leading factors affecting the change of soil available zinc content. The contribution to the decision coefficient R2 is more than 68.
【作者单位】：甘肃省农业科学院土壤肥料与节水农业研究所农业部甘肃耕地保育与农业环境科学观测实验站;
【基金】：国家自然科学基金项目(41261072) 农业部公益性行业科研专项(200903001) 甘肃省农业科学院科技创新专项(2015GAAS03)资助
【分类号】：S156.4

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