壳聚糖对土壤理化性状的影响

壳聚糖对土壤理化性状有较大的影响。当土壤中施入壳聚糖酸溶液后,土壤的团粒结构和渗透系数随壳聚糖施用量的增加而增加,而容重、CEC和pH则减小;在EC值上表现为先下降后上升的趋势。当壳聚糖施用量达到0.45‰对干土平均质量(W/W)]后,土壤物理性状的变化趋于稳定。3种壳聚糖酸溶液处理的土壤物理性状的变化趋势一致,无明显差异。在壳聚糖酸溶液中,酸作为溶剂本身对土壤物理性状的影响不大。壳聚糖酸溶液对土壤化学性状的影响过程较复杂,表现出是由壳聚糖和酸对土壤共同作用的结果。溶剂酸是影响土壤pH主要因素,其酸性越强,壳聚糖酸溶液的酸性就越强,处理后土壤的pH就越小。土壤CEC、EC同时受壳聚糖用量和溶剂酸种类的影响。

Effects of Chitosan on Soil Physical and Chemical Properties

The changes of soil physical and chemical properties were studied after the application of chitosan acid solution.The experimental results showed as follow.With increasing of chitosan acid solution,the water stable aggregate and permeability coefficient of soil increased,however,bulk destiny,CEC and pH of the soil were reduced,the soil EC decreased firstly,and then rised.The changes of physical and chemical properties appeared stable when the dose of chitosan exceeded 0.45‰(chitosan mass concentration relative to dry soil) on the soil.The consistency and non-significant difference were observed among changes of the treated soil physical properties on which acid as a solvent had few effects.It was complicated in the course of affecting the treated soil chemical properties under which was the composite actions of chitison and acid.The key factor that chitison affected the soil pH was solvent acidity,which rising led to increase of chitison acid solution acidity and decrease of the treated soil pH.Soil CEC and EC were under the collective influences of chitison dosage and solvent category.