3种方法对不同土壤类型速效磷测定结果的影响  

Influence of three methods on the determination of available phosphorus in different soil types

作　　者：高雅丽[1] 徐新超[1] 伏广农[1] 贾田[1] 张新明[1] 

机构地区：[1]华南农业大学资源环境学院,广东广州510642

出　　处：《广东农业科学》2011年第6期162-164,共3页Guangdong Agricultural Sciences

基　　金：国家现代农业产业(马铃薯)技术体系专项(MATS-zhsyz-26);国家公益性行业(农业)科研专项(nyhyzx07-006-1);国家科技支撑计划项目(2007BAD89B14)

摘　　要：选取广东主要母质(玄武岩母质、花岗岩母质和三角洲冲积物)发育的水稻土经过不同磷肥量盆栽试验后的样品作为供试材料,设0.5 mm和2 mm两种粒径,分别采用Olsen、Bray-1和Mehlich-3等3种方法测定土壤中速效磷含量。结果表明:Bray-1法与Olsen法和Mehlich-3法保持在0.01水平下线性相关,而Mehlich-3法与Olsen法却无显著线性相关关系;各方法测定值的相对大小因土壤而异,主要表现在玄武岩母质发育的水稻土上,Mehlich-3-P小于Olsen-P,其他主要母质发育的水稻土Mehlich-3-P却均大于Olsen-P;Bray-1-P为Mehlich-3-P的3～7倍不等,为Olsen-P的3～10倍不等,Mehlich-3-P为Olsen-P的2/3～3倍不等;土壤制样粒径对测定结果的影响不显著。Three types of soils were derived from three main parent materials（basalt,granite,Perl River Delta sediments） in Guangdong.In order to determine the available phosphorus,the samples were sifted through 0.5 mm and 2 mm sieve respectively,then extractants of three methods were used to extract the available phosphorus of soils and then molybdenum-antimony-anti-spectrophotometric was used for the color reaction of phosphorus in solution.The results show that the correlationship between Bray-1 method and Olsen method or between Bray-1 method and Mehlich-3 method are extremely significant（P0.01）,but there are no correlationship between Olsen method and Mehlich-3 method.Besides,the determination values measured by different methods change with soil types.The Olsen-P is smaller than Mehlich-3-P on soil samples derived from basalt,while on soil samples derived from the other two parent materials,the results are opposite.Approximately,Bray-1-P is 3 to 7 times of Mehlich-3-P,and is about 3 to 10 times of Olsen-P.Besides,Mehlich-3 is about 2/3 to 3 times of Olsen-P.The results also suggest that particle size had little influence,if any,on determination value,it means that both of the particle sizes could be used in measuring soil available phosphorus.

关 键 词：水稻土 速效磷 浸提剂 相关性 

分 类 号：S151.95[农业科学—土壤学]