苏打碱化土壤碱化参数的干湿季节动态变化

选取吉林省西部典型苏打碱化土壤,分别于干季6月、湿季8月和干季10月进行取样分析,测定计算土壤剖面各碱化参数(pH、SAR、SSP、SDR、总碱度、RSC和ESP),分析在气候干湿季节变化过程中各碱化参数的动态变化特征。研究结果表明,随着气候"干季-湿季-干季"的变化过程中,苏打碱化土壤各碱化参数也呈现较规律变化,其总体特征是各碱化参数在由干季向湿季(6月—8月)表现为升高趋势;而在湿季向干季(8月—10月)则表现为降低趋势。从变化幅度看,以表层土壤(0～20cm)变化更为显著。干季强烈蒸发作用导致地表积盐、湿季地下水位埋藏浅以及苏打碱化土壤通透性能差是造成湿季各碱化参数增大的主要原因。

Variations of alkalization parameters of soda solonetz during dry and wet season

A typical soda solonetz area in the west of Jilin Province was selected as the test region. Primary parameters of soda solonetz, including pH, sodium adsorption ratio (SAR), exchangeable sodium percentage (ESP), total alkalinity, etc., were determined to study the characteristics of temporal variability during dry and wet seasons. Soils were sampled in June (dry season), August (wet season) and October (dry season) in 2005. The depth of soil profile was 180 cm with a sampling interval was 20 cm. The results showed that primary parameters of soda solonetz in the profiles increased from June to August and decreased from August to October, especially in the topsoils (0 ~ 20 cm), which were attributed to the combined actions of the strong evaporation in arid climate, the shallow water table and the weak soil permeability.