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采用室内培养法测定了不同温度下(8、18、28℃)小兴安岭原始阔叶红松林和阔叶次生林土壤有机碳的矿化速率和矿化量,并用三库一级动力学模型对有机碳各库进行拟合.结果表明:基于单位干土质量的阔叶次生林土壤有机碳矿化速率和累计矿化量均大于原始红松林,但有机碳累计矿化量占总有机碳的比率小于原始红松林.2种森林类型土壤活性碳库和缓效碳库随土层加深而减小,其占总有机碳的比例增加.尽管阔叶次生林土壤活性和缓效碳库均大于原始红松林,但其占总有机碳的比例却小于原始红松林,而土壤惰性碳库及其比例均大于原始红松林,表明阔叶次生林土壤有机碳整体上更稳定.土壤活性碳库平均驻留时间(MRT)为9~24 d,且随土层加深而缩短,而缓效碳库MRT为7~42 a,且随土层加深而延长.土壤活性碳库及其占总有机碳的比例随温度升高而线性增加,缓效碳库则降低;原始红松林土壤活性碳随温度的增速大于阔叶次生林,表明原始红松林土壤有机碳库对温度变化反应更敏感.
Soil organic carbon mineralization rate and mineralization in the native broad-leaved Korean pine and broad-leaved secondary forests at different temperatures (8, 18, 28 ℃) were determined by indoor culture method. The organic carbon The results showed that the soil organic carbon mineralization rate and total mineralization in the secondary leafy forest based on unit dry soil mass were greater than that of the original Korean pine forest, but the ratio of total organic carbon mineralization to total organic carbon was less than that of the original Korean pine forests.The soil active carbon pools and slow-acting carbon pools of the two forest types decreased with the deepening of the soil layers, and their proportion in total organic carbon increased.Although the soil active and slow-acting carbon pools in the broad-leaved secondary forests were larger than the original korean pine forests, The proportion of total organic carbon was less than that of virgin Pinus koraiensis forest, and the proportion of soil inert carbon pool and its proportion was greater than that of virgin Pinus koraiensis forest, indicating that soil organic carbon was more stable in broadleaved secondary forest as a whole.The average residence time (MRT) 9 ~ 24 d, and shortened with the deepening of the soil layer, while the slow-acting carbon pool MRT was 7 ~ 42 a and lengthened with the deepening of the soil layer.The ratio of soil active carbon pool and its total organic carbon with increasing temperature Linear increase, slow carbon pool is down ; Korean pine raw soil with active carbon is larger than the growth temperature of the broadleaf forest, soil organic carbon virgin Pinus koraiensis showed more sensitive to temperature variations library reaction.