[目的] 分析在盐分影响下土壤pH值和表面电荷量的变化趋势,以及对土壤水稳性团聚体结构的影响,为设施园艺及菜园土壤的改良提供参考. [方法] 以合肥市周边地区的黄褐土为研究对象,研究盐分对土壤酸度、表面电荷以及水稳性团聚体含量的影响.试验设置了4个水平的盐分(0.3%,0.6%,0.9%,1.2%)处理和对照,在25 ℃恒温培养箱中进行了60 d的培养试验.分别在10,30和60 d取样分析. [结果] 盐分浓度越高,土壤pH值越低,培养60 d后1.2%处理与CK相比土壤pH值下降0.53;随着盐分浓度的升高,土壤的表面负电荷量呈递减趋势,正电荷量则变化不明显;模拟盐的增加能促进土壤中小团聚体相互胶结,从而促使水稳性大团聚体增多. [结论] 盐分能够使土壤pH值和表面负电荷量下降;使土壤发生胶结作用,有助于大团聚体的形成.
[Objective] The objective of this study is to analyze the variations of soil pH value and surface charge under salt stress, and its influences on the structure of soil water-stable aggregates in order to provide basis for the soil amelioration in horticulture and vegetable garden. [Methods] The laboratory incubation experiment was applied to investigate the effects of salt accumulation on pH value, electrochemical properties and water-stable aggregates of yellow cinnamon soil in the surrounding area of Hefei City. Four salinity treatments(0.3%, 0.6%, 0.9%, 1.2%) and a control treatment(CK) were set up and incubated for 60 d at 25 ℃ in incubator. The samples were then collected from the incubator at 10 d, 30 d and 60 d separately, for the following analysis. [Results] Soil pH value decreased with the increase of salt concentration. Compared to CK, soil pH value of the sample incubated after 60 d decreased by 0.53 at 1.2% salinity level. The amount of soil negative charge decreased with the increase of salt concentration, while there was no significant change in positive charge. The simulated salt with Ca2+, Mg2+ improved the cementation of micro-aggregates, and resulted in an increase of the amount of macro-aggregates. [Conclusion] Salt can decrease soil pH value and soil negative charge, and improve soil cementation, and also increase the amount of micro-aggregates.