| 钙质土壤施用过磷酸钙21年后土壤无机磷分级和磷素有效性 |
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| 作者姓名： | WANG Jun LIU Wen-Zhao MU Han-Feng DANG Ting-Hui |
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| 作者单位： | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100 (China);College of Urban and Environment, Northwest University, Xi’an 710127 (China);State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100 (China);College of Urban and Environment, Northwest University, Xi’an 710127 (China);State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100 (China) |
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| 基金项目： | the National Basic Research Program (973 Program) of China，the Knowledge Innovation Program of the Chinese Academy of Sciences，the National Natural Science Foundation of China |
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| 摘 要： | A long-term (21-year) field experiment was performed to study the responses of soil inorganic P fractions and P availability to annual fertilizer P application in a calcareous soil on the Loess Plateau of China. Soil Olsen-P contents increased by 3.7, 5.2, 11.2 and 20.6 mg P kg-1 after 21-year annual fertilizer P application at 20, 39, 59, and 79 kg P ha-1, respectively. Long-term fertilizer P addition also increased soil total P and inorganic P (Pi) contents significantly. The contents of inorganic P fractions were in the order of Ca10-P > Ca8-P > Fe-P > Al-P > occluded P > Ca2-P in the soil receiving annual fertilizer P application. Fertilizer P application increased Ca8-P, Al-P and Ca2-P contents as well as their percentages relative to Pi. Pi application increased Fe-P and occluded P contents but nor their percentages. Soil Ca10-P content remained unchanged after fertilizer P application while its percentage relative to Pi declined with increasing fertilizer P rate. All Pi fractions but Ca10-P were correlated with Olsen-P significantly. 90% of variations in Olsen-P could be explained by Pi fractions, and the direct contribution of Ca8-P was predominant. Long-term annual superphosphate application would facilitate the accumulation of soil Ca8-P, and thus improve soil P availability.
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| 关 键 词： | 土壤无机磷 无机磷组分 过磷酸钙 石灰性 应用 磷有效性 土壤速效磷含量 中国科学院 |
| 收稿时间： | 28 December 2009 |
Inorganic phosphorus fractions and phosphorus availability in a calcareous soil receiving 21-year superphosphate application |
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| WANG Jun,LIU Wen-Zhao,MU Han-Feng,DANG Ting-Hui.Inorganic phosphorus fractions and phosphorus availability in a calcareous soil receiving 21-year superphosphate application[J].Pedosphere,2010,20(3):304-310. |
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| Authors: | WANG Jun LIU Wen-Zhao MU Han-Feng and DANG Ting-Hui |
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| Institution: | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100 (China);College of Urban and Environment, Northwest University, Xi'an 710127 (China);State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100 (China);College of Urban and Environment, Northwest University, Xi'an 710127 (China);State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100 (China) |
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| Abstract: | A long-term (21-year) field experiment was performed to study the responses of soil inorganic P fractions and P availability to annual fertilizer P application in a calcareous soil on the Loess Plateau of China. Soil Olsen-P contents increased by 3.7, 5.2, 11.2 and 20.6 mg P kg-1 after 21-year annual fertilizer P application at 20, 39, 59, and 79 kg P ha-1, respectively. Long-term fertilizer P addition also increased soil total P and inorganic P (Pi) contents significantly. The contents of inorganic P fractions were in the order of Ca10-P > Ca8-P > Fe-P > Al-P > occluded P > Ca2-P in the soil receiving annual fertilizer P application. Fertilizer P application increased Ca8-P, Al-P and Ca2-P contents as well as their percentages relative to Pi. Pi application increased Fe-P and occluded P contents but nor their percentages. Soil Ca10-P content remained unchanged after fertilizer P application while its percentage relative to Pi declined with increasing fertilizer P rate. All Pi fractions but Ca10-P were correlated with Olsen-P significantly. 90% of variations in Olsen-P could be explained by Pi fractions, and the direct contribution of Ca8-P was predominant. Long-term annual superphosphate application would facilitate the accumulation of soil Ca8-P, and thus improve soil P availability. |
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| Keywords: | long-term experiment Olsen-P path analysis Loess Plateau |
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