塿土不同粒级组分K^+吸附研究  

STUDIES ON K^+ ADSORPTION OF DIFFERENT FRACTIONS OF LOU SOIL

作　　者：王玉[1] 张一平[1] 

机构地区：[1]西北农林科技大学资源与环境科学系,陕西杨陵712100

出　　处：《土壤学报》2001年第2期241-247,共7页Acta Pedologica Sinica

摘　　要：塿土各粒级Ｋ十吸附特征有很大区别。在一定平衡液浓度下，颗粒越细，土壤固相吸附量越大，不同粒级固相吸附量大小顺序是：（＜０．１μｍ）＞（＜１μｍ）＞（１－２μｍ）＞（２－５μｍ），不同粒级土壤有效阳离子交换量也具有相同的变化规律。混合样中不同粒级组分对吸附的贡献可用吸附贡献率表示，■土各粒级饱和吸附贡献率大小顺序为：（＜１μｍ）＞（１－２μｍ）＞（＞５μｍ）＞（２－５μｍ），其中粘粒部分的饱和吸附贡献率为８５％左右。在供试混合土样中＜１μｍ粒级吸附贡献率随平衡液浓度增大呈幂函数形式增大，相反，１～２μｍ、２－５μｍ粒级吸附贡献率随平衡液浓度增大则呈幂函数形式减小。实验证明混合样中不同粒级Ｋ＋吸附存在交互作用，吸附交互作用大小可用吸附交互作用系数表征，＜１μｍ和１－２μｍ之间存在吸附负交互作用，且随平衡液浓度增大而增强。＜１μｍ和２－５μｍ之间存在吸附正交互作用，且随平衡液浓度增大而减弱。论述了建立土壤多粒级组分吸附方程的必要性，提出了多粒级组分吸附方程：K+ adsorption of different particle fractions of lou soil varies greatly. At certain equilibrium concentration, the sequence of the amounts of K+ adsorbed in different soil particle fractions is (< O.1 μm) > (< 1 μm) > (1-2 μm) > (2-5μm), the same as that of the effective cation exchange capacity of different soil particle fractions. The contribution of each particle fraction to the total amount of adsorbed K+ is demonstrated by adsorption contribution rate. The order of the saturated adsorption contribution rates of different panicle fractions in lou soil is (< 1μm) > (1-2 μm) > (> 5 μm) > (2-5 μm), and the adsoption contribution rate of clay fraction attributes to nearly 85% of the total amount. In < 1 + 1-2 μm, < 1 + 2-5μm mixtures, the adsorption contribution rate of < 1 μm increases, whereas that of 1-2 μm, 2-5 μm decreases by the power function with increasing equilibrium concentration. The adsorptive interaction of different fractions has been verified. The adsorption interaction coefficient of < 1μm and 1- 2μm fractions is less than 1 and decreases with increasing c, indicating that the adsorption interaction of < 1 μm and 1-2 μm fractions is negative, and augments with c increment. The adsorption interaction coefficient of < 1μm and 2-5μm fractions is more than 1 and decreases with c increment which indicates that the adsorption interaction of < 1μm and 2-5μm fractions is positive and abates with increasing c. The necessity of setting up the multi-fraction adsorption equation has been confirmed. The multi-fraction adsorption equation is.

关 键 词：粒级 离子吸附 吸附贡献率 吸附交互作用 多粒级组分吸附方程 LOU土 钾吸附 

分 类 号：S153.61[农业科学—土壤学]