【摘要】 为探讨滨海盐碱区柽柳人工林对土壤有机碳组分及碳库管理指数的影响，以黄河三角洲不同林龄（3 a、8 a、12 a）柽柳人工林为研究对象，采用时空互代法，以毗邻的无林地（CK）为对照，研究了林龄变化对土壤有机碳（SOC）、活性有机碳（DOC、MBC、EOC）、惰性有机碳（ROC）及碳库管理指数（CPMI）的影响。结果表明：林龄能够影响不同土层SOC及其组分含量，并随土层深度增加而逐渐降低；林龄对SOC及其组分含量的影响一致，均表现为12 a>8 a>3 a>CK，其中3种林龄SOC平均含量（0—60 cm）较CK分别增加23.95%、46.38%和111.03%,DOC、MBC和EOC平均含量则以12 a增加最多，分别增加了127.06%、68.99%和78.49%，明显高于其它林龄，而ROC分别为CK的1.22倍、1.59倍和1.87倍，增加显著；不同林龄0—20 cm表层SOC及其组分含量显著高于其它土层（P<0.05），呈现明显的表聚现象，除3 a、12 a土层20—40 cm与40—60 cm土壤MBC含量无显著差异外，其它土层间均差异显著（P<0.05）；林龄的增加提高了各层土壤的CPMI，其中以12 a最高、8 a次之，且8 a与12 a提高显著；相关性分析表明，SOC及各组分间均达到显著和极显著水平。土壤EOC、DOC、MBC及ROC碳组分分别解释了SOC变化的93.50%、83.00%、53.82%和91.89%。综上，在滨海盐碱地区，林龄的延长有利于林地土壤有机碳各组分含量的积累和CPMI的提高。更多还原

【Abstract】 In order to study the effects of Tamarix chinensis plantations on soil organic carbon and carbon pool management indicators in coastal saline-alkali area, taking the Tamarix chinensis plantations at different ages(3 a, 8 a, 12 a) in the Yellow River Delta as research objects, using the space-time intergenerational method and taking the adjacent bare land(CK) as comparison, the effects of forest age on soil organic carbon(SOC), active organic carbon(DOC, MBC, EOC), resistant organic carbon(ROC) and carbon pool management indicators(CPMI) were studied. The results showed that SOC and its components in different soil layers could be affected by forest age, and decreased gradually with the increase of soil depth. The effects of forest age on SOC and its components were consistent, and the order of SOC and its components both were 12 a> 8 a>3 a>CK. Compared with CK, the average content of SOC(0—60 cm) at three forest ages increased by 23.95%, 46.38% and 111.03 % respectively. The average content of DOC、MBC and EOC of 12a increased by 127.06%, 68.99% and 78.49% respectively compared with CK, which were significantly higher than those at other forest ages. The average content of ROC at three forest ages increased significantly, which were 1.22, 1.59and 1.87 times of CK. The SOC and its components in the surface layer of 0—20 cm at different forest ages were significantly higher than those in other soil layers(P<0.05), and presented obvious surface aggregation. No significant differences were founded in MBC between soil layer of 20—40 cm and 40—60 cm at 3 a and 12 a, but there were significant differences among the other soil layers(P <0.05). The CPMI of different soil layers increased with the increase of forest age, and the CPMI of 8 a and 12 a increased significantly, with 12 a highest and 8 a second. The correlation analysis showed that SOC and its components all reached significant and extremely significant levels. The soil EOC, DOC, MBC and ROC carbon components could explained 93.50%, 83.00%, 53.82%and 91.89% of changing of SOC respectively. In conclusion, the extension of forest age is conducive to the accumulation of soil organic carbon components and the improvement of CPMI in coastal saline-alkali areas.更多还原