| 摘要: |
| 【目的】分析聚磷酸铵（APP）在石灰性土壤中的有效性，为APP的合理施用及高效磷肥的开发提供理论支持。【方法】通过土柱试验和模拟试验，以不施肥为对照（CK），对比APP和传统磷肥磷酸二铵（DAP）对石灰性土壤不同土层（0~5，5~10，10~20，20~30，30~40 cm）以及施用不同时间后土壤pH、有效磷含量和无机磷形态分布的影响。【结果】2种磷肥对石灰性土壤pH的影响均能达到0~10 cm土层，APP降低pH的能力较DAP更强。APP处理的土壤有效磷迁移深度可达0~10 cm土层，且有效磷含量随着施用时间的延长逐渐升高；而DAP处理仅显著提高了0~5 cm土层的有效磷含量，且土壤有效磷含量随着施用时间的延长逐渐降低。施用2种磷肥总体上均可增加各土层有效磷源含量，其中APP能在不同的土层形成更多的Ca8-P、Al-P和Fe-P，中高活性磷源Ca8-P和Ca2-P含量随施用时间的延长总体升高；培养60 d时,2种磷肥处理O-P和Ca10-P含量与CK差异不显著。【结论】施用APP不仅能显著降低石灰性土壤0~10 cm土层的pH值，而且能有效提高土壤有效磷含量，增加有效磷的迁移深度，能形成更多的中、高活性磷源，能降低或延缓土壤无效态磷的转化。 |
| 关键词: 石灰性土壤 聚磷酸铵(APP) 磷酸二铵(DAP) 有效磷 无机磷 |
| DOI： |
| 分类号: |
| 基金项目:国家重点研发计划项目（2018YFC1900202）；山东省重大科技创新工程项目（2019JZZY010723）；山东省大科学计划项目（2018-001）；安徽科技学院人才引进项目（NXYJ202002）；山东省自然科学基金项目（ZR2020MD106） |
|
| Effect of ammonium polyphosphate application on available phosphorus content and inorganic phosphorus distribution in calcareous soils |
|
WANG Xiaohua,YAN Ning,ZHANG Ying,et al
|
| Abstract: |
| 【Objective】This study analyzed the effectiveness of ammonium polyphosphate (APP) application in calcareous soils to provide support for rational application of APP and development of high effective phosphate fertilizer.【Method】Soil column and incubation experiments were conducted with no fertilizer as control (CK) to study the effect of APP and diammonium phosphate (DAP) application on soil pH,available phosphorus content and inorganic phosphorus distribution in different soil layers (0-5,5-10,10-20,20-30 and 30-40 cm) and different application time durations in calcareous soils using no fertilizer as control (CK).【Result】Both phosphorus fertilizers reduced pH in the layer of 0-10 cm soil layer,and APP had larger effects than DAP.The migration depth of available phosphorus reached 0-10 cm after applying APP,and the content increased with time.DAP only significantly increased available phosphorus content in the layer of 0-5 cm,and the content decreased gradually with time.The available phosphorus sources content of each soil layer increased in general by applying both phosphate fertilizers.APP application lead to more Ca8-P,Al-P and Fe-P formation in different soil layers,and Ca8-P and Ca2-P increased in general with application time as medium and high activity phosphorus sources.The O-P and Ca10-P contents showed no significant differences between CK and treatments with phosphorus fertilizers after 60 days.【Conclusion】APP application could significantly reduce pH in the soil layer of 0-10 cm,effectively increase available phosphorus content,extend migration depth of available phosphorus,form more medium and high activity phosphorus sources and reduce conversion of invalid phosphorus sources. |
| Key words: calcareous soil ammonium polyphosphate（APP） diammonium phosphate（DAP） available phosphorus inorganic phosphorus |
