不同设施农业土壤中无机磷转化比较——以潮土和砂姜黑土为例

A Comparative Study on the Transformation of Fractions of Inorganic Phosphorus in Different Facility Agricultural Soils——A Case Study of the Fluvo-Acquic Soil and Shajiang Black Soil

以皖北设施农业区主要土壤类型——潮土和砂姜黑土为例,对比研究两种土壤中磷素的转化,并分析了施肥浓度对各无机磷形态转化的影响.采用增施外源磷肥的盆栽预实验,然后经由蒋柏藩、顾益初提出的石灰性土壤无机磷分级方法,测定各自无机磷的转化情况,最后对实验数据进行分析比较.结果表明:设施土壤会因起始土壤的不同,其各形态无机磷转化是迥异的;本文还采用指数曲线较好地反映了砂姜黑土和潮土中各形态无机磷转化与施入磷浓度的关系;还进一步分析了两种土壤中无机磷转化的分配规律.

Samples of fluvo-acquic soil and shajiang black soil which are the typical soils in facility agriculture in northern Anhui province along the Huai River were taken and the transformation of different fractions of inorganic phosphorus in them were studied and compared,and the effects of the concentration of the phosphorus application on different fractions of inorganic phosphorus in the surface soils were analyzed.Before testing the transformation of the fractions of inorganic phosphorus in the soils,a pot experiment was conducted,in which exogenous P was added at different concentrations.20 days after fertilization,the transformation of different fractions of inorganic phosphorus in these soils was determined with the method first described by Jiang Baifan and Gu Yichu,and the data obtained were analyzed and compared.The results indicated that soils of facility agriculture derived from different parent soils significantly affected the transformation of different fractions of inorganic phosphorus.The relationship between phosphorus application concentration and the transformation of different fractions of inorganic phosphorus could well be described with an exponential regression curve.In addition,the phenomenon was interpreted that with increasing Al-P content,the content of Fe-P decreased at the same time and the total transformation proportion of Al-P and Fe-P remained unchangeable.