【摘要】 氧弹量热计测定结果表明，不同施肥条件土壤胡敏酸热值（能态）呈现堆肥＞秸杆＞化肥＞无肥＞休闲的顺序，各施肥处理定位试验１０年的胡敏酸能态比４年者为低。热分析结果表明，不同施肥条件土壤胡敏酸均有相似的热效应峰和失重峰；施有机肥处理呈现ＤＴＡ４６０℃放热峰焓变值小，ＤＴＧ失重峰活化能低的趋势；定位试验１０年的胡敏酸，ＤＴＡ３４０℃放热峰已不明显，４６０℃放热峰的焓变值显著高于４年，ＤＴＧ失重峰的活化能亦为１０年者大于４年。土壤胡敏酸的Ｅ＿４、Ｅ＿６值呈现无肥＞化肥＞秸杆＞堆肥的顺序，且定位试验１０年者均大于４年。红外光谱分析证实了供试胡敏酸能态及热解的一些特性。更多还原

【Abstract】 The results obtained by using an Oxygen-bomb calorimeter showed that the ca-loric value（energy state）of soil humic acid under different conditions of fertiliza-tion decreased in the following order:compost>straw>chemical fertilizer>nofertilizer>fallow。The energy state of fixed position experiment of ten years waslower than that of four years。The results of thermal analysis showed that soil humic acid under differentconditions of fertilization had a similar peak of heat effect and peak of weight loss. The treatment of organic fertilizer applied tended to low in both the enthalpy changevalue of 460℃ exothermic peak of DTA and activation energy of weight loss peakof DTG. The 340℃ exothermic peak of DTA of humic acid in the fixed positionexperiment of ten years was not more obvious and the enthalpy change value of460℃ exothermic peak was higher than those of four years.The activation energyof weight loss peak of DTG was higher in the ten-year fixed position experimentthan in the fouz- years fixed position experiment. The sequence of E₄ and E₆ values of soil humic acid was no fertilizer>che-mical fertilizer>straw>compost and the values in the fixed position experiment often years was higher than those of four years。The analysis of infrared spectra confirmed the charateristics of energy stateand pyrolysis of humic acid used。更多还原