| 在DAP-CaCO3体系与DAP-石灰性土壤体系中NH3的挥发与磷的吸附之间的关系 |
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| 引用本文： | 吕殿青,简森雄.在DAP-CaCO3体系与DAP-石灰性土壤体系中NH3的挥发与磷的吸附之间的关系[J].土壤学报,1988,25(1):40-48. |
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| 作者姓名： | 吕殿青 简森雄 |
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| 作者单位： | 陕西省农业科学院;美国国际肥料开发中心 |
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| 摘 要： | 本工作是研究在CaCO3体系和石灰性土壤体系中NH3的挥发与磷的吸附之间相互作用的化学变化,结果表明:在NH4Cl—CaCO3体系中,通气的pH值比不通气的低,但溶液中Ca2+浓度正好相反。在K2HPO4-CaCO3体系中,在24小时内,通气与不通气的,CaCO3吸附磷没有差异。在24小时反应期间,在DAP-CaCO3体系中,因溶液pH值不断增高,NH3的挥发对CaCO3吸附磷的影响也就逐渐降低。在石灰性土壤体系中,施用尿素加过磷酸钙或单施尿素时,几乎没有发现NH3的挥发,而施DAP时,在6天后,NH3的挥发损失占加入的56%,且DAP处理的土壤,其水溶性磷未通气比通气的高。尿素加过磷酸钙处理的,其水溶性磷通气与未通气的没有差异。另外,尿素加过磷酸钙或过磷酸钙单独处理的土壤,水溶性磷含量均相同。所有这些均表明,在石灰质体系中,NH3的挥发(如果发生的话)能够加强CaCO3对磷的吸附,而磷的吸附又能加强NH3的挥发,两者是相互影响和相互促进的过程。
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R ELATIONSHIP BETWEEN NH3 VOLATILIZATION AND P SORPTION IN THE SYSTEMS OF DAP-CaCO3 AND DAP-CALCAREOUS SOIL |
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| Lu Dianqing and Jian Senxiong.R ELATIONSHIP BETWEEN NH3 VOLATILIZATION AND P SORPTION IN THE SYSTEMS OF DAP-CaCO3 AND DAP-CALCAREOUS SOIL[J].Acta Pedologica Sinica,1988,25(1):40-48. |
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| Authors: | Lu Dianqing and Jian Senxiong |
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| Institution: | Shaanxi Academy of Agricultural Sciences;International Ferterlizer Development Center U. S. A. |
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| Abstract: | In the system of NH4C1-CaCO3, the pH of solution with aeration was lower than that without aeration, whereas the reverse was found for solution Ca2+ concentration. In the system of K2HPO4-CaCO3 no significant differences in P sorption by CaCO3 were observed between aeration and nonaeration during the entire reaction period of 24 hours. The effect of NH3 volatilization on P sorption by CaCO3 gradually diminished during 24 hour reaction time as solution pH increased in the system of DAP-CaCO3. (diammonium phosphate) In the calcareous soil, very little NH3 volatilization was found in the treatments of urea+ISSP or urea alone. On the other hand, approximately 56% of DAP-N initially applied was lost as NH3 from the soil after 6 days. The amount of water soluble P in the soil treated by DAP without aeration was higher than that with aeration, whereas no significant difference was mbserved between treatments of urea+SSP with aeration and without aeration. Furthermore,the amount of water-soluble P in the soil was about the same in the treatments with urea-I-SSP or with SSP alone. All these. observation suggest that NHa volatilization, if it occurs, can enhance P sorption by CaCO3 in calcareous soils, while the P sorption also enhance the NH3 volatilization. Thus the NH3 volatilization and P sorption are promoted and affected by each other. |
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