| 朱謇,樊秉乾,郜斌斌,陈清.添加氧化镁和铵明矾对菜田高磷土壤活性磷的影响[J].农业环境科学学报,2018,37(5):948-955. |
| 添加氧化镁和铵明矾对菜田高磷土壤活性磷的影响 |
| Effect of magnesium oxide and alum addition on soil labile phosphorus in a high P content vegetable field |
| 投稿时间：2017-09-12 |
| DOI：10.11654/jaes.2017-1247 |
| 中文关键词: 高磷土壤 氧化镁 明矾 磷素形态 磷素固定 |
| 英文关键词: high P soil magnesium oxide alum phosphorus fraction phosphorus fixation |
| 基金项目:国家重点研发计划"京津冀设施农业面源和重金属污染防控技术示范"（2016YFD0801006） |
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| 中文摘要: |
| 为研究不同种类钝化剂对土壤磷素的固定效果，通过室内培养试验，向土壤中添加氧化镁、铵明矾及二者不同比例的混合物，研究其对土壤0.01 mol·L-1 CaCl2浸提磷、0.5 mol·L-1 NaHCO3浸提磷含量及磷素组分的影响。结果表明：与未钝化的对照处理相比，向土壤分别添加0.5%和2.0%（m/m）的氧化镁、铵明矾或其混合物培养45 d后，均显著降低了土壤CaCl2浸提磷含量。添加氧化镁或铵明矾分别降低了87.8%（0.5%）、98.0%（2.0%）和44.4%（0.5%）、88.8%（2.0%）的CaCl2浸提磷含量，而二者混合物的钝化效果明显弱于氧化镁。添加2.0%的氧化镁、铵明矾或其混合物对土壤NaHCO3浸提磷含量降低明显，但氧化镁和铵明矾的混合物降低土壤NaHCO3浸提磷的效果弱于铵明矾。对培养45 d后的土壤进行Hedley分组测定磷素组分发现，添加氧化镁或铵明矾显著降低了土壤H2O浸提总磷和NaHCO3浸提总磷含量，添加铵明矾显著增加了土壤中NaOH浸提总磷的含量。氧化镁、铵明矾和土壤活性磷不同的作用机理是导致氧化镁固定CaCl2-P效果显著而铵明矾固定Olsen-P效果显著的主要原因。 |
| 英文摘要: |
| In order to study the effect of different kinds of phosphorus(P) stabilization materials on the fixation of soil P, an incubation experiment was conducted to investigate the abilities of magnesium oxide(MgO), alum, and their mixtures at different ratios to reduce 0.01 mol·L-1 CaCl2 extracted P(CaCl2-P), 0.5 mol·L-1 NaHCO3 extracted P(Olsen-P), and the soil P fraction. The results indicated that the addition of MgO and alum could significantly decrease the soil CaCl2-P level compared with the control treatment, and this occurred at both 0.5% and 2.0% soil dry weight. After 45 d incubation, MgO decreased soil CaCl2-P by 87.8%(0.5%) and 98%(2.0%), whereas alum addition reduced soil CaCl2-P by 44.4%(0.5%) and 88.8%(2.0%). The MgO, alum, or a mixture addition at 2.0% soil dry weight significantly decreased soil Olsen-P level. The decline of soil CaCl2-P and Olsen-P influenced by the mixture of MgO and alum was less effective than that of MgO and alum, respectively. The results after measuring the soil P fraction by Hedley fractionation indicated that MgO or alum addition significantly decreased the soil labile P level, and alum significantly increased the NaOH extracted P content compared to the control treatment. In general, MgO significantly decreased the CaCl2-P levels, but alum also significantly decreased the Olsen-P due to the different P fixation mechanism. |
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