茂兰喀斯特森林凋落物量的动态研究

Study on the dynamic variation of litter falls in Maolan Karst forest

对地处中亚热带的茂兰喀斯特森林的凋落物贮量、季节变化规律及年凋落量进行了研究。结果表明:茂兰喀斯特森林的年均凋落物量为2.86 t/hm2,与其他类型的森林相比,年均凋落物量较低。凋落物量各组分中,叶凋落量占绝大部分,常绿叶凋落量仅为落叶叶凋落量的1/2。在凋落量季节动态中,秋季(8至10月)为凋落量的高峰,且大多为落叶种类;而常绿种类叶凋落量全年较为平稳。这些规律是植物的生物生态学特性及对非地带性的喀斯特因素长期适应的结果。

The litter storages, its seasonal variation and annual litter falls of Maolan Karst forest in mid-subtropical zone were studied. The average annual litter falls of Maolan Karst forest was 2.86 t/hm^2 , which was lower than the other forest types. Among the litter compositions, the leaf accounted for the majority of all litter falls, while leaf falls of evergreen species merely accounted for half of those of the deciduous species. In the seasonal variation, a peak of the litter falls emerge in autumn and was mainly composed of the deciduous species, and leaf falls variation of evergreen species was not obvious and comparatively stable. These rules were the results of the long-term adaption of plant biological and ecological characteristics to azonal Karst factors.