长期定位施肥对棕壤钾素吸附解吸动力学特征的影响

doi:10.3864/j.issn.0578-1752.2012.21.008

Abstract

Abstract: 【Objective】The objective of study was to investigate the kinetics characteristics of K+ adsorption and desorption of brown soil under long-term (32 years) fertilization.【Method】Nine samples of different treatments were flowed through with deionized water as pretreatment. Miscible displacement techniques were used to study the adsorbing-desorbing process. 【Result】The equilibrium time of adsorption ranged from 26 min to 65 min, and that of desorption ranged 65-130 min. The ranges of equilibrium adsorbing capacity and the equilibrium desorbing capacity were 7.40-19.44 cmol•kg-1 and 0.070-0.258 cmol•kg-1. The relation between velocity of potassium adsorbing and time could be described with the model of V=A+Blnt. There were correlation between parameters of adsorption and desorption were related with CEC, Clay, OM and available K in different degrees. First-order, Elovich, Parabolic diffusion and Dual constant were used to describe the kinetics of K adsorption and desorption of experimental soils. The results showed that Elovich and First-order were the best kinetic models for describing adsorption and desorption, respectively.【Conclusion】There were great different characteristics of adsorption and desorption under different fertilizations. The ability of adsorption could be increased by applying organic manure. And the ability of desorption improved with potassium rates. The effect of long-term fertilization on K+ adsorption and desorption kinetics of brown soil was up to the changes of physic-chemical properties of soil. There were different dynamic processes of potassium in soil under different fertilizations.

Key words: kinetic model of potassium, adsorption, desorption, brown soil, long-term fertilization

LI Na, HAN Li-Si, WU Zheng-Chao, WANG Yue, LAN Yu, HAN Xiao-Ri. Kinetics of K+ Adsorption and Desorption of Brown Soil Under Long-Term Fertilization[J].Scientia Agricultura Sinica, 2012, 45(21): 4396-4402.

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Kinetics of K+ Adsorption and Desorption of Brown Soil Under Long-Term Fertilization

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