中文摘要：

近年来兴起的电感耦合等离子体发射光谱法（ICP-AES）测定土壤的速效K和Na采用HCl-H2SO4浸取溶液,而以往大量的土壤速效K和速效Na的数据是用火焰光度法（FAAS）测定的,其溶液用NH4OAc浸取。为了探索两种方法数据的可转换性,使历史数据可用,选择了四种土壤,同时用FAAS法和ICP-AES法进行测定,对数据进行比较。结果表明,两种方法测定的土壤速效K数据呈显著正相关（0.98,p〈0.001）,两种方法的数据间可以通过公式换算：y=1.14x＋6.53（r^2=0.91,n=24,p〈0.001）。两种方法测定Na的结果可比性比K差,虽然两种方法的数据总体上呈显著正相关（0.51,p〈0.05）,但壤土和砂壤单独模型的斜率与总模型差距均较大,因此针对不同类型的土壤应用不同的公式进行换算比较合适,即壤土：y=1.23x＋10.03;砂壤：y=3.12x-23.03;海砂和河沙归为一类,公式：y=0.60x。

英文摘要：

In recent years, inductively coupled plasma atomic emission spectrometry （ICP-AES） have been commonly used to determine the soil available K and Na with the extraction solution of HCl-H2 SO4, while previous data of soil available K and Na were measured by flame atomic absorption spectrometry （FAAS） with the extraction solution of NH4OAc. In order to utilize previous data, quest for the convertibility of the data determined by ICP-AES and FAAS, and compare the data determined by both methods, the authors chose four types of soil to determine soil available K and Na by ICP-AES and FAAS, respectively. Four types of soil represent grit soil, clay, silt from river and silt from sea, respectively. Soil samples included four types Of soil and these samples represent different soil nutrition. The authors analyzed the correlations of two kinds of measured data. The paired samples t-test proves that there was significantly positively correlation between these two methods. The correlation coefficient of the data between these two methods for measuring soil available K is 0. 98. The results of soil available K determined by the two methods can be conversed through the formula, y=1. t4x＋6.53 （R^2 =0. 91, n=24, p〈0. 001）. As for Na, although there is a significantly positively correlation between these two methods, the slopes of single model of clay and grit soil were different from that of general model. And so the results determined by the two methods can be conversed through different formula according to the types of soil, that is, for clay： y=1. 23x＋10.03; for grit soil： y=3. 12x-23. 03; for silt： y=0. 60x. In conclusion, the authors＇ results showed that previous data of available K and Na measured by FAAS with the extraction solution of NH4OAc were available. And these data were comparable to the data measured by ICP-AES through definite formula. The authors＇ results also suggested that ICP-AES was preferable when many elements were measured at the same time. Under this condition, ICP-AES was