中文摘要：

基于目标树经营、粗放经营、无干扰3种经营模式，分析黑龙江省丹清河林场针叶混交林、阔叶混交林、针阔混交林3种天然次生林的碳贮量变化。结果表明：1）林分碳贮量排序均为目标树经营（162.74～205.85 t·hm -2）＞无干扰（128.88～150.47 t·hm -2）＞粗放经营（107.59～130.57 t·hm -2），且目标树经营与无干扰、粗放经营的碳贮量差异显著（ P ＜0.05）；2）林分各层次碳贮量大小依次为土壤层（57.33%～70.38%）、乔木层（28.01%～39.83%）、凋落物层（0.50%～2.69%）、灌木层（0.21%～1.00%）、草本层（0.07%～0.56%）；3）土壤层碳贮量排序为目标树经营＞无干扰＞粗放经营，0～20 cm土层碳含量和碳贮量比重最大；4）乔木层碳贮量排序均为目标树经营＞无干扰＞粗放经营，目标树经营与无干扰、粗放经营差异显著（P＜0.05），干材碳贮量最大，占乔木层碳贮量的46.58%～54.72%；5）灌木层、草本层碳贮量排序均为无干扰＞粗放经营＞目标树经营，无干扰与粗放经营、目标树经营差异均显著（P＜0.05）；6）凋落物层碳贮量排序为目标树经营大于粗放经营和无干扰。目标树经营能够增加林分、土壤、乔木层碳贮量，是提高东北天然次生林碳汇功能的重要经营模式。

英文摘要：

How to increase carbon stock in forest ecosystems by optimizing forest management strategy has increasingly become a concern in the world. We analyzed the changes in carbon stock in three natural secondary forests,i. e. , coniferous forest,broadleaved forest and conifer-broadleaved mixed forest,in Danqinghe Forest Farm,Heilongjiang Province,based on the three management regimes including target-trees management,extensive management and non-disturbance regime. The results showed that： 1 ） The total stand carbon stock was ranked in order of target-tree management （162. 74 -205. 85 t·hm -2 ） 〉 non-disturbance management （ 128. 88 -150. 47 t·hm -2 ） 〉 extensive management （ 107. 59 -130. 57 t·hm -2 ） ,and target-tree management differed significantly in carbon stock from non-disturbance and extensive management （P〈0. 05）. 2） Layers in these stands had different amount of carbon stock,followed in percentage by soil layer （57. 33% -70. 38%） ,tree layer （28. 01% -39. 83%） ,litter layer （0. 50% -2. 69%） ,shrub layer （0. 21% -1. 00%） ,and herb layer （ 0. 07% -0. 56%） . 3 ） The carbon stock in soil was in order of target-tree management〉 non-disturbance management 〉 extensive management,and carbon content and carbon stock reached the utmost level in the soil 0 -20 cm deep. 4 ） Carbon stock of tree layer was in order of target-tree management 〉 non-disturbance management 〉 extensive management,and there was significant difference between target-tree management and non-disturbance,extensive management regimes （ P 〈0. 05 ） ,while carbon stock in stems were proportionally the＆amp;nbsp;highest in the tree layer,accounting for 46. 58% to 54. 72%. 5） Carbon stock in shrubs and herbs showed the same order as non-disturbance management 〉 extensive management 〉 target-tree management,and non-disturbance management was significantly different from target-tree and extensive management regimes（P〈0. 05）. 6） In terms of carbon stock in litters, target-tr