矿山复垦区女贞人工林生态系统碳的源汇效应

Carbon Sink or Source Effect of Ligustrum Plantation Ecosystem in Mine Reclamation Area

采用LI-8100土壤碳通量测定系统,测定了淮南大通煤矿塌陷复垦区女贞人工林土壤碳排放动态,并结合生物量调查,建立相对生长模型,对复垦区女贞林生态系统碳的源汇效应及其特征进行了研究。结果表明:复垦区女贞林生态系统年生物量碳增量为7.72 t/(hm^2·a),其中乔木层占81.22%,林下植被占4.02%,枯死掉落物占14.76%;乔木层生物量碳年增量大小顺序依次为树干>树枝>树根>树叶,在乔木层中所占的比例依次为54.7%、22.37%、16.9%、6.06%;女贞林生态系统年净生态系统生产力NEP值为1.87 t/(hm^2·a),表明复垦区女贞林生态系统整体表现为碳汇,其中乔木层对碳汇的贡献率占77.54%。

Based on the measurements of soil carbon flux and the biomass survey,the carbon sink or source effect of Ligustrum plantation ecosystem in reclamation district filled by coal gangue in Datong district of Huainan City,China was determined. Results indicate that the biomass carbon annual increment of Ligustrum plantation ecosystem is 7. 72 t/（ hm^2·a）,with tree layer accounted for81. 22%,understory vegetation accounted for 4. 02% and the dead litter accounted for 14. 76%.The biomass carbon annual increment in the tree layer is in order of trunk〉branch〉root〉leaves,with the proportions of 54. 7%,22. 37%,16. 9%,and 6. 06%,respectively;the NEP of Ligustrum plantation ecosystem in reclamation district is 1. 87 t/（ hm^2·a）,which shows that the Ligustrum plantation ecosystem is a carbon sink,with the contribution rate of the tree layer accounted for 77. 54%.