海南岛中部丘陵地区受台风侵袭影响的4种植物群落凋落物动态

为探讨台风后凋落物组成和量的特征,在"达维"台风后的1 a中,测定了海南岛中部丘陵地区次生植被草丛、灌丛、次生林及人工马占相思林的凋落物.结果显示:1)各植被年凋落物量与同类型植被正常年凋落物量相比,明显偏低;2)在台风后的第3个月起次生植被月凋落物量有逐渐回升趋势,人工马占相思林月凋落物量无明显回升趋势;3)各植被类型凋落物叶的比例,均低于同类型植被正常年份凋落物中叶的比例;4)4种植被凋落物凋落节律未因台风而发生明显变化,次生植被为"双峰"特征,人工马占相思林无明显的落叶季节.

Dynamics of litterfall of four vegetations in hilly areas of central Hainan after disturbance of a severe typhoon

In order to explore the characteristics of litter in hilly areas in central Hainan after a severe typhoon, litters were collected in one year after typhoon 'Dawei' on the study sites where there are grassland, shrub land, secondary forest and Acacia mangium plantation. The results showed that 1) annual litterfall productions of four vegetations were lower than those of the similar type of vegetations; 2) monthly litterfall production of secondary vegetations tended to rise from the third month after the typhoon, but A.mangium plantation had no such trend; 3) the proportion of leaf litter in four types of litter were lower than those of the similar type of vegetations; 4) the seasonal rhythm of litterfall in four vegetations had no change after the typhoon, namely, secondary vegetations were of double falling peaks and A.mangium plantation had no distinct falling peak.