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为了查明Olsen法(碳酸氢钠提取态磷)是否适用于酸性土壤有效磷的测定,土壤P吸附参数及它们之间的关系,利用同质地不同磷含量酸性土壤提供了这方面的信息。结果表明,Olsen法适用于酸性土壤植物有效磷的测定,Olsen P与植物磷吸收量表现出极显著相关。磷最大吸附量(Qm)与磷吸附强度(K)显著负相关。土壤缓冲容量随取样次数增加逐步减少,第3次取样时,土壤缓冲容量高磷处理(P3)>中磷处理(P2)>低磷处理(P1)>无磷处理(P0),说明随着生长时间增加,作物从土壤带走磷量增加,含磷量低的土壤磷缓冲容量随之降低。Olsen P与Qm,K均无显著相关,但土壤磷吸附饱和度、Olsen P均证实,实验用土壤目前不会因增加施磷量而引发环境问题。磷吸附参数与Olsen P从环境和农业生产需求两方面说明了土壤磷素丰缺状况。
In order to find out whether the Olsen method (sodium bicarbonate extractable phosphorus) is suitable for the determination of available phosphorus in acid soils, the adsorption parameters of soil P and the relationship between them, this information is provided by the use of acidic soils with different phosphorus contents. The results showed that Olsen method was suitable for the determination of available phosphorus in acid soils. Olsen P showed a significant correlation with phosphorus uptake by plants. The maximum phosphorus adsorption (Qm) was negatively correlated with the phosphorus adsorption (K). The soil buffer capacity decreased gradually with the increase of sampling times. At the third sampling, the soil buffer capacity of high phosphorus treatment (P3)> medium phosphorus treatment (P2)> low phosphorus treatment (P1)> no phosphorus treatment (P0) Increasing the growing time, the amount of phosphorus carried away from the soil increased, and the phosphorus buffer capacity of soil with low phosphorus content decreased. There were no significant correlations between Olsen P and Qm and K, but the saturation of soil phosphorus adsorption and Olsen P both confirmed that the experimental soil would not cause environmental problems at present because of increasing the amount of phosphorus applied. Phosphorus sorption parameters and Olsen P illustrate soil phosphorus abundance and deficiency from both environmental and agricultural production needs.