调查海南霸王岭热带低地雨林群落学特征,研究林下棕榈植物对树木幼苗更新的影响。结果表明: 在1 hm2热带低地雨林样地中,共记录到5种棕榈植物1 288株,其中大白藤的个体数占棕榈个体总数的82.7%; 不同棕榈物种的平均个体冠幅面积存在差异,大叶蒲葵显著大于其他4个物种;小样方棕榈植物多度在群落中呈显著的正态分布; 小样方中棕榈多度与胸径<10 cm树木个体数量存在显著负相关,大树数量与棕榈数量无显著的相关性; 小样方中大幼苗、幼树和小树物种丰富度随棕榈多度增加而减小,而小幼苗和大树的物种丰富度与棕榈多度无相关性; 棕榈个体覆盖降低了更新幼苗的密度,仅有18%的幼苗(包括小幼苗和大幼苗)分布于棕榈树冠之下; 在棕榈覆盖下小幼苗的个体比例低于大幼苗; 53%的幼苗物种能够在棕榈覆盖下更新,97%的幼苗物种能够在无棕榈覆盖下更新; 短寿命先锋种幼苗主要分布于无棕榈覆盖生境中,11.6%的长寿命先锋种分布于棕榈覆盖下的生境中,而19.8%的后期种能够在棕榈覆盖的生境中更新。
In this study, we examined the ecological effect of palms on tree seedlings regeneration in a tropical lowland rain forest plot in Bawangling, Hainan Island. The results showed that there were 1 288 palm plants which belonged to 5 species in a 1 hm2 plot, and Calamus faberii contributes 82.7% to the total palm plants. The mean individual crown area differed among 5 species and Livistona saribus was significantly larger than other 4 species. The palm number in each subplot showed a normal distribution. The palms abundance of the subplot was significantly negative correlated with the number of trees DBH<10 cm, but not with that of the large trees. The species richness of large seedlings, saplings, and small trees significantly decreased with increase of the palm abundance in each subplot, but no relationship was found between the richness of small seedlings and large trees with the palm abundance. The palm coverage reduced the seedlings density and there were only 18% seedlings recruited under the palms. Compared to the micro-sites with no palms cover, more small seedlings under palms recruited than large seedlings did. There were respectively 53% and 97% of species recruited in the micro-site with and without palms coverage. The short-lived pioneer species distributed exclusively in sites without palms cover. There was 11.6% and 19.8% of long-lived pioneer species seedlings and late species seedlings regenerated under palms cover, respectively.
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