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以鼎湖山森林植被恢复演替过程中的松林(初期)、混交林(中期)和季风林(后期)为研究对象,通过测定其土壤总有机碳(TOC)、易氧化有机碳(ROC)和不易氧化有机碳(NROC)及凋落物13C-NMR分析,以期阐明森林植被恢复演替过程中土壤有机碳组分变化规律及其原因。结果表明:(1)3个森林土壤ROC含量差异不显著;由松林向季风林演替过程中,ROC占TOC的比例下降。松林新鲜凋落物层的烷氧基碳含量(57.03%)高于季风林(49.10%)和混交林(54.50%)。(2)3个森林土壤NROC含量差异显著,大小顺序为:季风林>混交林>松林。混交林和季风林凋落物半分解层和已分解层的惰性指数明显高于松林。TOC趋势与NROC一致。南亚热带森林由松林向季风林恢复演替过程中,土壤有机碳的稳定性增加,惰性有机碳的持续积累可能是季风林和混交林土壤TOC积累的一个重要过程。
Based on the data of TOC, ROC and TOC in the process of forest succession and succession in Dinghushan, the main forest stands were pine forest (initial stage), mixed forest (intermediate stage) and monsoon forest (later stage) 13C-NMR analysis of NROC and litter, with a view to clarify the variation of soil organic carbon components and their causes during the succession of forest restoration succession. The results showed that: (1) There was no significant difference in ROC content among the three forest soils. During the succession from pine forest to monsoon forest, the proportion of ROC to TOC decreased. Alkoxy carbon content (57.03%) in fresh litter layer was higher than that in monsoon forest (49.10%) and mixed forest (54.50%). (2) There were significant differences in NROC content among the three forest soils, with the order of monsoon forest> mixed forest> pine forest. The Inertial Index of litter decomposition and decomposed layer in mixed forest and monsoon forest was significantly higher than that in pine forest. TOC trend is consistent with NROC. During the succession process from the pine forest to the monsoon forest, the stability of soil organic carbon increased in the south subtropical forest. The continuous accumulation of inert organic carbon may be an important process of TOC accumulation in the monsoon forest and mixed forest soil.