ABSTRACT

Conventional intensive cultivation tends to modify the interactions of phosphorus in soil, favoring inorganic forms transformations. The aim of the study was to evaluate the status of inorganic phosphorus and correlate with the chemical, physical and mineralogical soil properties in areas under natural vegetation and different cultivation periods: 1, 17, 22, 28, 32 and 43 years. Soil P was extracted using Chang and Jackson method (Al-P, Fe-P, Ca-P and Residual-P). The micro-chemical map of P concentrations within the representative aggregates was determined by electron probe. Results showed that biofertilizers application in the area under intensive cultivation for 32 years of use significantly increased all soil P fractions (4.249 mg kg⁻¹ in upper soil layer). There was a slight increase in the P at the edges of the aggregates in the first year (0.23%), but at 43 years, there was an increase in contents within the aggregates (0.32%). The intensive cultivation promoted the increase of P content in soil fractions in the arable layer of the soil over time. However, the decline in inorganic P contents after a few years of cultivation suggests that the soils of the studied areas tend to exceed their maximum adsorption capacities in the future.

摘要

传统的集约化耕作往往会改变土壤中磷的相互作用，有利于无机形态的转化。该研究的目的是评估无机磷的状况，并与自然植被和不同栽培期（1、17、22、28、32 和 43 年）区域的化学、物理和矿物土壤特性相关联。使用 Chang 和 Jackson 方法（Al-P、Fe-P、Ca-P 和 Residual-P）提取土壤磷。代表性聚集体中 P 浓度的微化学图由电子探针确定。结果表明，在经过 32 年使用的集约化耕作地区施用生物肥料显着增加了所有土壤磷组分（4.249 mg kg ^-1在上层土层）。第一年骨料边缘的 P 略有增加 (0.23%)，但在 43 年时，骨料内的含量有所增加 (0.32%)。随着时间的推移，集约化耕作促进了土壤耕层中土壤组分中磷含量的增加。然而，经过几年耕种后无机磷含量的下降表明，研究区的土壤在未来往往会超过其最大吸附能力。