设计不同的温度条件和加活性炭与否,对采自全国各地的21个土样进行有效磷测定。结果表明:对土壤类型复杂地区的土壤有效磷测值,用校正系数来纠正温度影响是不合适的。活性炭在纯水中对H_2PO_4-有明显的吸附作用,而当溶液中存在着大量的HCO_3-时则不表现出吸附现象。当土壤有机质含量在1.1～6.49％范围内,Olsen法中加活性炭的措施不能省略。 Designing different temperature conditions and adding active charcoal or not, 21 samples of soil collected from all over the country were measured for available phosphorus. The results showed that it is not suitable to correct the temperature effect by using the correction coefficient for soil available phosphorus measured in the soil of complex types. Activated carbon has obvious adsorption to H 2 PO 4 - in pure water, but does not show adsorption phenomenon when there is a large amount of HCO 3 - in solution. When the soil organic matter content in the range of 1.1 ~ 6.49%, Olsen method plus activated carbon can not be omitted.