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| 长期不同施肥土壤中磷淋溶“阈值”研究 | |
| 引用本文： | 刘利花,杨淑英,吕家珑. 长期不同施肥土壤中磷淋溶“阈值”研究[J]. 西北农林科技大学学报(自然科学版), 2003, 31(3): 123-126 |
| 作者姓名： | 刘利花 杨淑英 吕家珑 |
| 作者单位： | 1. 西北农林科技大学,资源环境学院,陕西,杨陵,712100 2. 西北农林科技大学,生命科学学院,陕西,杨陵,712100 |
| 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) |
| 摘 要： | 对长期 (2 4年 )不同施肥土壤中磷淋溶趋势的研究结果表明 :土壤耕层 Ca Cl2 - P和 Water- P的含量远比 Olsen- 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 ;Ca Cl2 - P和 Water- P之间以及 Water- P和 Olsen- P之间的相关系数均达到极显著水平 ;土壤耕层中 Olsen- P含量达 2 3mg/ 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 |
| 文章编号： | 1671-9387(2003)03-0123-04 |
| 收稿时间： | 2002-12-30 |
| 修稿时间： | 2002-12-30 |
Studies on "threshold value" of phosphorus leaching in long-term different fertilization soils |
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| Affiliation: | LIU Li hua 1,YANG Shu ying 2,Lü Jia long 1 (1 College of Resources and Environment;2 College of Life Sciences,Northwest Sci Tech University of Agriculture and Forestry,Yangling,Shaanxi 712100,China) |
| Abstract: | Studies on "threshold value" of phosphorus leaching in long term different fertilization soils was conducted.The results showed that:(1) the contents of CaCl 2 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 CaCl 2 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. |
| Keywords: | soil phosphorus phosphorus leaching threshold value |
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