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首页> 外文期刊>Journal of Plant Nutrition and Soil Science >Effect of phosphorus status of the soil on selenium availability
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Effect of phosphorus status of the soil on selenium availability

机译：土壤磷素状况对硒有效性的影响

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摘要

Due to its importance for human and animal health, low bioavailability of selenium (Se) is of concern in large parts of the world. Among the factors determining Se availability is competition for binding sites by other anions. In order to evaluate the effect of different soil P status on Se availability from fertilizer, adsorption studies were conducted with soils ranging from low to very high available P as measured in ammonium lactate (P-AL) and addition of Se as either selenate or selenite. Generally selenite, and to some extent also selenate, adsorption decreased with increasing P-AL status of the soil. However, in a silt loam, the increase in P-AL from 140 (high) to 210 mg P kg–1 (very high) did not result in a corresponding decrease in Se adsorption. Phosphorus saturation, on the other hand, was found to be lower in the sample that was very high in available P, suggesting that both the total amount of P on binding sites and the amount of plant-available P influence Se availability. Selenate addition caused an increase in P availability, especially when added together with phosphate to a silt loam with very high P-AL status.
机译：由于其对人类和动物健康的重要性，硒（Se）的低生物利用度在世界大部分地区都引起关注。决定硒可用性的因素包括与其他阴离子竞争结合位点。为了评估不同土壤P状况对肥料中Se有效性的影响，对吸附水平从低到非常高的土壤（如乳酸铵（P-AL））进行了吸附研究，并添加了硒酸盐（硒酸盐或亚硒酸盐） 。通常，亚硒酸盐（在一定程度上也呈硒酸盐）吸附随着土壤P-AL含量的增加而降低。然而，在粉壤土中，P-AL从140（高）增加到210 mg P kg -1 （非常高），并没有相应地降低Se的吸附。另一方面，在有效磷很高的样品中，磷的饱和度较低，这表明结合位点上的磷总量和植物有效磷的含量均会影响硒的有效性。硒酸盐的添加会增加磷的利用率，尤其是当与磷酸盐一起添加到具有非常高P-AL状态的粉质壤土中时。

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