| 摘要: |
| 对长期(24年)不同施肥土壤中磷淋溶趋势的研究结果表明：土壤耕层CaCl2-P和water-P的含量远比O1sen-P要小得多，可以淋溶的磷素含量普遍较低；长期施用厩肥和化肥加秸秆并休闲的土壤更易发生磷素淋溶；CaCl2-P和water-P之间以及water-P和O1sen-P之间的相关系数均达到极显著水平；土壤耕层中O1sen-P含量达23 mg/kg，是该土壤发生磷素淋溶的“阈值”。 |
| 关键词: 土壤磷 磷淋溶 阈值 |
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| 基金项目:教育部留学回国人员科研启动基金资助项目;陕西省自然科学基金项目(2002D09) |
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| Studies on “threshold value” of phosphorus leaching in long-term different fertilization soils |
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| Abstract: |
| Studies on “threshold value” of phosphorus leaching in long-term different fertilization soils was conducted.The results showed that:(1) the contents of CaCl2-P and Water-P were far lower than that of Olsen-P in soil plow layer,so the content of leaching phosphorus was low;(2) It was easy to replace phosphorus leaching by long-term application of farm yard-manure-and fallow with long term application of chemical fertilizers and corn litter;(3) it had very significance between CaCl2-P and Water-P,and between Water-P and Olsen-P,the correlation coefficients were 0.920 4** and 0.779 9**,respectively;and (4)“threshold value” of phosphorus leaching from the soils was 23 mg/kg of Olsen-P content. |
| Key words: soil phosphorus phosphorus leaching threshold value |
