【摘要】 采用Claassen的养分吸收机理模型定量评价了不同土壤条件下，机理模型中未考虑的其它适应机制对玉米与大豆幼苗P吸收的作用。结果表明：同样土壤养分胁迫条件下，供试玉米与大豆幼苗的其它适应机制对P吸收的贡献率分别为1/4与1/5；土壤养分胁迫、土壤水分胁迫、土壤供N形态、土壤性质及土壤供Ca水平或pH值对这一P吸收适应机制的作用程度均有一定的影响，土壤水分胁迫能明显加强这一适应机制对玉米幼苗P吸收的作用；粘质棕红壤上养分胁迫与水分胁迫同时作用时，这一适应机制对玉米幼苗P吸收的贡献率可达69％。更多还原

【Abstract】 This paper dealt with the effect of other adaptive mechanism on P uptake by seedlings of maize and soybean using the mechanistic nutrient uptake model proposed by Claassen. The studies showed that; (a) under the same soil conditions of P stress, the 1/4 of P absorbed by maize seedlings and 1/5 of P absorbed by soybean seedlings attribute to the effect of other adaptive mechanism; (b) soil nutrient or water stress, N forms applied by soil, soil properties and soil Calevel or PH value can influence the effect of other adaptive mechanism on P uptake, and soil Water stress can strengthen this effect evidently. (c )under the soil conditions of both soil P and water stress on clay brown-red soil, the effect of this adaptive mechanism can reach up to 69% of total P uptake by maize seedlings.更多还原