【摘要】 众多的试验表明：对于给定的养分离子，吸收动力学参数Ｉｍａｘ（最大吸收速率）、Ｋｍ（Ｉ＝１／２Ｉｍａｘ时介质的离子浓度）、Ｃｍｉｎ（离子吸收速率为零时介质中离子的最低浓度）和Ｅ（离子外溢速率）在不同种类、不同品种的植物间有明显的差异，且受植株的苗龄、养分供应状态等因素的影响。动力学参数在研究根系吸收特性、根系对土壤养分的适应性、在鉴定和筛选养分吸收高效基因型及预测根系对土壤养分的吸收等方面具有重要的意义。更多还原

【Abstract】 Absorption of nutrients such as NO - 3, H 2PO - 4,K +,Ca 2+ ,SO 2- 4,Mg 2+ ,Zn 2+ ,and Cl - by plants. Such as barley, wheat, rice, corn and legumes was extensively investigated. It has been tested and proved by numerous experiments that kinetic parameters ( K m, I max , C min and E ) of given nutrient ions vary greatly among species and cultivars, and are influenced by plant age and nutrient supply. It follows that the parameters are of theoretical and practical importance in studying the adaptability of root system to its environment; in evaluating and screening absorption-efficient genotypes and in predicting nutrient absorption from soil by plant root system.更多还原