作　　者： ; ; ; ; ; ;

机构地区： 中国农业科学院农业资源与农业区划研究所

出　　处： 《土壤学报》 2011年第4期773-780,共8页

摘　　要： 研究了一种土壤供氮能力快速测定方法-土壤碱溶有机质的测定,以及碱溶有机质与常规土壤有机质的相关性、碱溶有机质与植株氮素吸收的相关性及其在测土推荐施肥中的初步应用。选择我国有代表性的潮土、黑土、红壤土样各50个,研究土壤碱溶有机质与常规方法-丘林法测定的土壤有机质的相关性,结果显示二者呈极显著相关(p>0.01),相关系数r=0.9345,相关直线回归方程为:土壤有机质(g kg-1)=3.3265μ碱溶有机质(g kg-1)+6.9389。选择代表我国主要土壤类型的28个土样进行盆栽试验,研究土壤供氮能力测定方法与植株氮素吸收的相关性,结果表明,土壤碱溶有机质与不施氮处理植株吸氮量相关性极显著(相关系数为0.628,p>0.01),且其相关系数高于土壤有机质和土壤全氮与植株吸氮量的相关系数。虽然土壤碱溶有机质与植株氮素吸收的相关性低于生物培养方法即好气培养2周后土壤矿质氮(硝态氮+铵态氮)与植株氮素吸收的相关性,但土壤碱溶有机质更适合测土推荐施肥实验室高效快速测定的需要,可见碱溶有机质是可浸提的土壤腐殖质,可用比色法快速测定并能较好估测土壤的供氮能力,值得推荐在测土配方施肥实验室应用。 A project was carried out to study a basic EDTA method for measuring soil organic matter, and correlations of basic EDTA organic matter with Tyurin organic matter, and with plant N uptake, and application of the method in soll testing and nitrogen fertilizer recommendation. Lab analysis of 50 soil samples each for red soil, fluvo-aquic soil and black soil, typical of the soils in China revealed that basic EDTA organic matter was highly correlated with Tyurin organic matter, being 0. 9345 （p 〉 0. 01 ） in correlation coefficient and forming a linear regression equation, i. e. Tyurin organic matter（g kg^-1 ） =3. 3265 basic EDTA organic matter（g kg^-1 ） ＋ 6. 9389. Pot experiments using 28 major types of soils on N deficiency and plant N uptake indicated that basic EDTA organic matter was significantly correlated with plant N uptake, and its correlation coefficient （ R = 0. 628 ,p 〉 0. 01 ） was higher than that of the correlation of Tyurin organic matter and soil total N with plant N uptake. Although the correlation coefficient between basic EDTA organic matter and plant N uptake was not as high as that between soil mineral N after 2 weeks of aerobic incubation and plant N uptake, basic EDTA organic matter is extracted soil humic matter and can be fast determined with photometry. Therefore, the EDTA method for soil organic matter is a better means for estimating soil N supplying capacity and worth recommending to the laboratory for use in the soil testing and N fertilizer recommendation.

关 键 词： 碱溶有机质 土壤供氮能力 土壤有机质 氮素 推荐施肥

领　　域： [农业科学] [农业科学]