通过室内培养实验 ,研究了玉米秸秆分解期间全土及其水溶性物质、轻组和重组的有机碳数量随时间的动态变化规律。结果表明 :随培养时间的延长 ,全土有机碳量呈下降的趋势 ;玉米秸秆的残留碳和残留率也呈下降的趋势 ,而分解率逐渐增加 ;水溶性物质数量呈下降的趋势 ;轻组碳量和追加复合量呈下降的趋势 ;重组碳量和原土复合量呈先增加后下降的变化趋势 ,而原土复合度和追加复合度则逐渐增加 Through indoor cultivation experiments, the dynamic changes of soil organic matter, water-soluble substances, light and reorganized organic carbon during corn stalk decomposition over time were studied. The results showed that with the prolongation of incubation time, the total organic carbon in the soil decreased, the residual carbon and residual rate of corn stalks also decreased, but the decomposition rate increased gradually, while the quantity of water-soluble substances decreased. The amount of compound and the amount of additional compound showed a downward trend; the content of recombinant carbon and original compound increased first and then decreased, while the degree of original compound and additional compound increased