使用某些磷活化剂可增加石灰性土壤中遗留磷的植物利用率。,Journal of Environmental Management

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使用某些磷活化剂可增加石灰性土壤中遗留磷的植物利用率。
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2019-12-09 , DOI: 10.1016/j.jenvman.2019.109952
Zedong Teng ₁ , Jing Zhu ₂ , Wen Shao ₁ , Keyao Zhang ₁ , Min Li ₁ , Michael J Whelan ₃

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土壤中的遗留磷（P）在肥料施用中累积了数年，超出了农作物的需求，这是一种巨大且尚未开发的资源。P活化剂可以通过加速其转化为可溶性P馏分的方式来提高植物对P的利用率。在这项研究中，我们评估了四种“ P活化剂”（草酸，木质素，植酸酶和抗坏血酸）在两种小麦中使用的磷缺乏钙质土壤的实验室培养实验中增加植物有效磷的潜力。分析样品的Olsen P，磷酸单酯酶和Hedley顺序P分馏。四种处理均对不同的土壤磷含量具有显着影响。草酸主要增强了可从HCl萃取的P库中无机P（Pi）的溶解度。木质素增强了NaOH的不稳定性，HCl和残留P池。植酸酶和抗坏血酸主要影响有机磷组分（Po）。草酸和木质素显示出改善P的最大潜力（H2O-P，NaHCO3-Pi和NaHCO3-Po），分别增加110-419％和4.1-122％。这些发现说明了与不同的P活化剂有关的P释放的潜在机制，并加强了其在石灰性土壤中增加农业中传统P可用性的应用的理由。

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Increasing plant availability of legacy phosphorus in calcareous soils using some phosphorus activators.

Legacy phosphorus (P) in soil, accumulated over several years of fertilizer application in excess of crop demand, represents a huge and largely untapped resource. P activators can increase the availability of this P to plants by accelerating its transformation into soluble P fractions. In this study, we evaluated the potentials of four "P activators" (oxalic acid, lignin, phytase and ascorbic acid) to increase plant available P in a laboratory incubation experiment with two P-deficient calcareous soils used for wheat production. Samples were analysed for Olsen P, phosphomonoesterase and with Hedley sequential P fractionation. All four treatments had significant effects on different soil P fractions. Oxalic acid mainly enhanced inorganic P (Pi) solubility from the HCl-extractable P pool. Lignin enhanced P lability from the NaOH-, HCl- and residual-P pools. Phytase and ascorbic acid principally affected the organic P fractions (Po). Oxalic acid and lignin showed most potential to improve P (H2O-P, NaHCO3-Pi and NaHCO3-Po) availability, which increased by 110-419% and 4.1-122%, respectively. These findings illustrated the potential mechanisms responsible for P release associated with different P activators and reinforced the case for their use in increasing legacy P availability for agriculture in calcareous soils.

更新日期：2019-12-09

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