SURVIVORSHIP AND GROWTH OF SEEDLINGS OF 4 DIPTEROCARP SPECIES IN A TROPICAL RAIN-FOREST OF SARAWAK, EAST MALAYSIA
SURVIVORSHIP AND GROWTH OF SEEDLINGS OF 4 DIPTEROCARP SPECIES IN A TROPICAL RAIN-FOREST OF SARAWAK, EAST MALAYSIA
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DOI：
10.1007/bf02347859
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发表时间：
1995-12-01
影响因子：
2
通讯作者：
LEE, HS
中科院分区：
文献类型：
--
作者：
ITOH, A;YAMAKURA, T;LEE, HS
本文研究了4种龙脑香属植物（Dipterocarpus actangulus、D.在马来西亚东部沙捞越的龙脑香混交林中，用2.5年的时间研究了10种主要的龙脑香植物（包括：Dipterocarp globosus、Dryobalanops aromatica、Dryobalanops lanceolata）的生长情况。扩散前的种子捕食率大的D。globosus（75%）比D.披针叶杜松（27-34%）和芳香杜松（18-26%）。两种鳞毛蕨种子在传播后，受脊椎动物侵害的比例不到20%。从种子传播到幼苗脱落子叶的过程中，两种龙脑香属植物的种子死亡率（约90%）高于两种鳞毛蕨属植物（约60-70%）。在此期间的主要死亡因素是连根拔起和种子/幼苗被昆虫或脊椎动物捕食。幼苗脱落子叶后，所有物种均表现出恒定的死亡率，D为34%/年、15- 16%/年、17%/年和6%/年。actangulus、尖叶拟步行虫D. lanceolata、毛叶藓D. aromatica和D，globosus，分别在林下层。死亡率较低，在阴影较少的条件下比在阴影较多的D。aromatica和D. actangulus，但D. lanceolata和D.球状体大部分死亡的幼苗被倒下的树枝杀死，或者被发现与枯萎的叶子一起站立，可能是由于水分胁迫。没有显着的相关性，发现种子/幼苗死亡率和距离母树或初始密度的种子/seedrooms为所有物种。每种植物的平均产叶量与其栖息地的漫射光因子呈显著正相关。
Survivorship and growth of seedlings of four dipterocarp species (Dipterocarpus actangulus, D. globosus, Dryobalanops aromatica, Dryobalanops lanceolata) were studied for 2.5 years in a mixed dipterocarp forest in Sarawak, East Malaysia. Predispersal seed predation rates were larger for D. globosus (75%) than D. lanceolata (27-34%) and D, aromatica (18-26%). Less than 20% of the two Dryobalanops seeds were damaged by vertebrates after seed dispersal. During the period from seed dispersal to the time when the seedlings had shed cotyledons, more dispersed seeds died in the two Dipterocarpus (ca 90%) than the two Dryobalanops (ca 60-70%). The major mortality factors during this period were uprooted and seed/seedling predation by insects or vertebrates. After the seedlings shed cotyledons, all species showed constant mortality rates of 34, 15-16, 17 and 6%/year for D. actangulus, D. lanceolata, D. aromatica and D, globosus, respectively, in the forest understorey. Mortality was lower in less shaded conditions than in more shaded ones for D. aromatica and D. actangulus, but not significantly different for D. lanceolata and D. globosus. A majority of dead seedlings were killed by fallen branches or were found standing with wilted leaves, probably due to water stress. No significant correlation was found between seed/seedling mortality and distance from mother trees or the initial density of seeds/seedings for all species. The mean leaf production was positively correlated with the estimated diffuse light factor of their habitats for each species.