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以4个柚木优良无性系1年生苗木为试材,采用营养液培养和离子消耗曲线模拟方法,测定了根系的Ca2+、Mg2+、K+、NO-3吸收动力学参数。结果表明,以根系总吸收面积和总干重计算的Ca2+、Mg2+、K+、NO3-最大吸收速率相接近。在Ca2+、Mg2+、K+、NO3-最大吸收速率(Vmax)及离子流入速率(α值)指标上,不同基因型之间差异较大,而在养分离子吸收亲合力(Km)指标上,则没有明显差异。缅甸种源无性系VI-23根系对Ca2+、Mg2+、NO3-的Vmax及α值均为最大,而印度种源无性系70-12根系则对K+的Vmax及α值为最大,表明缅甸种源无性系VI-23为Ca、Mg和NO3--N硝态氮高效吸收基因型,印度种源无性系70-12为钾高效吸收基因型。
Taking 4 teak elite clones as experimental materials, the kinetic parameters of Ca2 +, Mg2 +, K + and NO-3 in root system were determined by nutrient solution culture and ion expenditure curve simulation method. The results showed that the maximum absorption rate of Ca2 +, Mg2 +, K + and NO3- was calculated based on the total root absorption area and total dry weight. There were significant differences among different genotypes in the indexes of Ca2 +, Mg2 +, K +, NO3- maximum absorption rate (Vmax) and ion inflow rate (α value), but not in the indicators of nutrient ion affinity (Km) Significant differences. The Vmax and a values of Ca2 +, Mg2 + and NO3- were highest in root system of VI-23 in Burkina Faso, while the Vmax and a value of K + in Indian root system clone 70-12 were the largest, indicating that Burmese provenance Clone VI-23 is a highly efficient uptake genotype of nitrate nitrogen for Ca, Mg and NO3 - N, while Indian progeny clones 70-12 are highly efficient genotypes of potassium.