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长期定位施肥试验中土壤可溶性有机磷的变化规律及其有效性研究 被引量:9

Dynamics and availability of soil soluble organic phosphorus in a long-term fertilization experiment
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摘要 基于潮土长期定位施肥试验(1989-2004),利用三种浸提剂(水、NaHCO3、Mehlich 3)和ICP-AES测定法初步研究了土壤可溶性有机磷的变化规律、有效性以及不同施肥措施对有机磷有效性的影响。结果表明,长期不施磷的处理,土壤可溶性有机磷的含量常年维持在本底的极低水平;施用有机肥明显增加可溶性有机磷的含量,有机肥与NPK配施次之,只施无机肥料增加的幅度相对较小;施磷而不施氮(PK处理)导致三种浸提剂提取的磷90%以上为无机态。水、NaHCO3及Mehlich 3浸提的有机磷占对应浸提总磷的比例分别为18.8%、14.5%和8.9%,这部分有机磷与作物地上部吸磷量、土壤有机质达到极显著正相关,表现出较高的有效性,在磷素贫乏的土壤中表现更为明显,是土壤有效磷库的重要来源。 Based on the long-term (1989 to 2004) field fertilization experiment in calcareous fluvo-aquic soil with crop rotation of winter wheat and summer maize, three extractants (water, NaHCO3, Mehlich 3) and the method of ICP-AES were used to study the dynamics and availability of soil soluble organic phosphorus as well as the effect of different fertilization treatments on organic phosphorus availability. The results showed that: 1 )Soil soluble organic phosphorus values maintained at the wondrously low level as background soil without applying phosphorus fertilizer; while soil soluble organic phosphorus contents increased significantly with the application of organic manure, followed by combined application of organic manure and inorganic fertilizer. However, application of inorganic fertilizer alone showed a relatively lower effect; 2) Applying inorganic fertilizer phosphorus without nitrogen(PK) inorganic phosphorus accounted for more than 90 % of total phosphorus extracted by three extractants; 3)Water, NaHCO3 and Mehlich 3 extractable organic phosphorus accounted for 18.8%, 14.5% and 8.8% of homologous extractable total phosphorus, respectively; 4) Water, NaHCO3 and Mehlich 3 extractable organic phosphorus were positively correlated with accumulated phosphorus in the shoot of crops and soil organic matter, and showed high availability especially in phosphorus-sterile soils, which demonstrated that organic phosphorus was an important source of soil available phosphorus pools.
出处 《植物营养与肥料学报》 CAS CSCD 北大核心 2007年第5期844-849,共6页 Journal of Plant Nutrition and Fertilizers
基金 国家重点基础研究发展规划"973"项目(2005CB121102)资助
关键词 长期定位试验 潮土 有机磷 有效性 ICP long-term fertilization experiment fluvo-aquic soil organic phosphorus availability ICP
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