【摘要】 在黄瓜的4个生长时期分别从水平方向和垂直方向取样并测定土壤的无机阴离子含量,研究了无机阴离子NO3-、SO42-和Cl-在土壤中的运移和分布规律。结果表明,阴离子在垂直方向的含量随时间推移不断下降,NO3-下降缓慢而持续时间长,SO42-和Cl-开始下降幅度大,后变得缓慢。土壤阴离子在垂直方向的运移变化比水平方向明显。更多还原

【Abstract】 Soil samples were collected from different vertical and horizontal directions in four sections of cucumber development.And then the anions of soil samples were measured.The movement and distribution of anions were studied.Results showed that the content of NO3-?SO42-and Cl-decreased in vertical direction with the process of time.The content of NO3-deduced slowly while NO3-stayed in soil for a long time.The content of SO42-and Cl-decreased fast at the beginning of the growth,and then it decreased slowly.The changes of anions’ moving at vertical direction were more distinct than that of horizontal direction.更多还原