| 摘要: |
| 用盆栽试验对玉米幼苗磷吸收进行了分析,并结合土壤和玉米根系磷运移和吸收参数的测定 ,用稳态吸收模型进行了计算。结果表明 ,随着土壤施磷量的增加 ,玉米幼苗含磷量和吸磷量明显提高 ;对于同一施磷水平 ,随着生长时间的增加 ,玉米幼苗的吸磷量增加的幅度较快;不同施磷处理玉米幼苗磷吸收的计算值和实测值均线性相关;养分吸收模型的玉米幼苗磷吸收模拟值与实测值具有很好的一致性 ,能很好地反映出幼苗吸收磷的变化趋势。单因素敏感性分析表明,影响作物根系磷吸收因素的大小顺序为L>Cav>r0>α>Deb>v0>rx;某些参数的变化可以影响其他一些参数的原有水平 ;用图型分析法能准确地反映r0,Deb,Imax,Cav,v0和rx等参数之间的两维和多维相互关系 |
| 关键词: 土壤-根系统 养分运移 养分吸收 模型验证 参数敏感性分析 |
| DOI： |
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| 基金项目:国家杰出青年基金资助项目(49725102) |
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| Numerical simuation of nutrient transfer and absorption in soil-root systemⅡ.Mathematical model verification and the sensitivity analyese of the parameters |
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| Abstract: |
| Experiment with pots were conducted for corn seeding P absorption,combining with stuver of P transfe and uptake absorption parameter of soil and corn.This paper calculated P uptake by the steady-state model.The results show that:there was an obvious increase of corn seeding P content and absorption P quanity with quantity increase of P fertilization appplication in soil;for the same P applicationlevel,corn seeding P absorption quantity increase is rapid with the increase of growty time;a linear relation was obtained with measured and calculated P uptake in different soil P application treatments,consistency that corn seedling absorbed and calculated P uptake can reflect well plant P absorption change tendency;Single factor sensitivity analysis shows,the size order that affects crop absorption P factors is L>Cav>r0>α>Deb>v0>rx;Method of Graphical analysis can reflect two dimensional and multidimensional mutual relations beteen r0,Deb,Imax,Cav,v0和rx etc. |
| Key words: soil-root system nutrient uptake model verification parameter sensitivity analysis |
