亚热带典型森林凋落物及细根的生物量和碳储量研究

细根和地上凋落物分解和周转，是建模和预测土壤碳汇需要测量的2个关键生态过程，通过对亚热带典型常绿阔叶林、杉木、马尾松林和毛竹林110个样地内凋落物和细根的生物量和碳储量进行研究，分析了森林细根和地上凋落物的生物量和碳储量以及彼此之间的差异和相互关系。结果表明：杉木林凋落物生物量 （4415 ± 0390） t/hm2最大，毛竹林 （2918 ± 0310） t/hm2最小，且与其他森林差异显著；凋落物碳储量毛竹林 （1176 ± 0260） t/hm2最小，与其他森林碳储量差异显著，最大的是常绿阔叶林 (1725 ± 016) t/hm2；4种不同森林类型细根生物量和碳储量差异显著，同一森林类型不同土层活和死细根生物量差异显著；从活/死根值中可知，常绿阔叶林细根周转要比针叶林 (杉木、马尾松) 快。

Relationships Between Biomass and Carbon Storage of Litter and Fine Root in Subtropical Typical Forests

The decomposition and turnover of fine root and litter, which were the two key processes for modeling and forecasting soil carbon sequestration in forest ecosystem. In order to understand the differences and interactions between biomass and carbon storage of fine root and litter, a field based study in 110 plots of evergreen broad leaf forest, including Cunninghamia lanceolata plantation, Pinus massoniana plantation and Phyllostachys edulis plantation was conducted. The results showed that the highest litter biomass was in Cunninghamia lanceolata plantation, at (4415 ± 039)t/hm2, while the lowest was in Phyllostachys edulis plantation, at (2918 ± 031)t/hm2, and the significant difference was found between Phyllostachys edulis plantation and other three forests; the litter carbon storage of Phyllostachys edulis plantation was the lowest, at (1176 ± 0260) t/hm2, and it was significantly lower than other forests, while the highest carbon storage of litter was found in evergreen broad leaf forest at (1725 ± 016)t/hm2; the biomass and carbon storage of fine root among the four types of forests were significantly different. Moreover, the dead and alive fine root biomass had obvious dissimilarity in different layers of same type of forest or plantation; according to the fine root ratios of dead/alive, the turnover rates of fine root in evergreen broad leaf forests was faster than that in coniferous forests (Cunninghamia lanceolata and Pinus massoniana plantation).