不同碱性条件对苏打盐碱土无机磷组分的影响

为了阐明不同碱性条件下苏打盐碱土无机磷各组分的含量及转化情况,通过室内模拟试验结合室内分析方法,以吉林省西部地区苏打草甸碱土为研究对象,对不同pH条件下土壤不同形态无机磷组分含量的动态变化进行了研究。结果表明,在一定范围内降低碱土pH值有利于增加土壤中Ca2-P、Fe-P、AlP及Ca8-P等形态磷的含量,其中pH值8.3处理比pH值9.2处理分别提高了44.8%,4.1%,45.9%,42.0%;比pH值10.2处理分别提高了81.5%,19.6%,39.3%,103.7%;O-P含量受土壤pH值的影响相对较小,改变土壤pH值短时期内不会导致其含量发生变化;Ca10-P的含量随着土壤中pH值的升高而增加,pH 10.2处理比pH 9.2处理和pH 8.3处理的Ca10-P含量分别提高15.6%和51.4%。研究表明,不同碱性条件可以影响土壤无机磷各组分之间的转化,碱土pH值降低有利于提高土壤中有效态磷组分的含量,但减少了潜在磷源的含量。

Influence of Different Alkaline Conditions on Inorganic Phosphorus Components of Soda Saline Soil

To find out the effect of different alkaline conditions on inorganic phosphorus components of soda saline soil, this research selected the soda meadow alkaline soil in western Jilin province as the research object, and used the method of indoor simulation experiment combined with indoor analysis to study the dynamic changes of the components of inorganic phosphorus content in soil of different forms under different alkaline conditions. The results showed that reducing alkali soil pH value within a certain range was helpful to increase the contents of Ca2-P, Fe-P, Al-P, and Ca8-P, which increased by 44.8%, 4.1%, 45.9%, and 42.0% in pH 8.3 treatment compare with those in the pH 9.2 treatment, and increased by 44.8%, 4.1%, 45.9%, and 42.0% compare with those in the pH 10.2 treatment; the effect of pH on O-P content was relatively small, and pH change in short term would not affect its content; Ca10-P content in soil increased with the increasing soil pH value, which increased by 15.6% and 51.4% respectively in the pH 10.2 treatment compare with those in pH 9.2 and pH 8.3 treatments. The research showed that different alkaline conditions could affect the conversion between the different inorganic phosphorus, and the decrease of soil pH value was good at the increase of the content of valuable phosphorus, but led to the decrease of the content of potential phosphorus in soil.