SEED SIZE OF WOODY-PLANTS IN RELATION TO DISTURBANCE, DISPERSAL, SOIL TYPE IN WET NEOTROPICAL FORESTS
SEED SIZE OF WOODY-PLANTS IN RELATION TO DISTURBANCE, DISPERSAL, SOIL TYPE IN WET NEOTROPICAL FORESTS
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DOI：
10.2307/2265827
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发表时间：
1995-12-01
期刊：
影响因子：
4.8
通讯作者：
BROWN, VK
中科院分区：
文献类型：
--
作者：
HAMMOND, DS;BROWN, VK
新鲜和干燥质量的木本植物种子在马布拉山，圭亚那进行了评估，根据传播模式，间隙大小的偏好，和土壤类型。从扩散模式和林窗大小偏好两个方面对秘鲁马努和巴拿马巴罗科罗拉多Island（BCI）的木本树种进行了分析。较大的种子在这三个网站显着相关的树冠或紧急树木或藤本植物，是分散的哺乳动物或重力和招聘最好的小差距。种子大小的变化，占株高和生活型的影响后，可以解释的扩散模式（马布拉山：22%，马努：14%，BCI：26%）和间隙大小偏好（马布拉山：9%，马努：7%，BCI：11%）。土壤类型的偏好，仅分析马布拉山，与种子大小无关。Mabura Hill的平均种子大小显著大于Manu或BCI。短期的演替过程可以解释网站内的种子大小的变化，传播模式是特别重要的定义种子大小的选择在演替过程中。然而，短期的演替过程不能解释不同地点之间的种子大小的变化。这表明，这种变化可能是由于土壤和干扰的大尺度变化对种子大小的影响在三个网站之间的差异。
Fresh and dry masses of seeds of woody species collected at Mabura Hill, Guyana were evaluated according to dispersal mode, gap size preference, and soil type. Data published for woody species from Manu, Peru and Barro Colorado Island (BCI), Panama were analyzed by dispersal mode and gap size preference for comparison. Larger seeds at the three sites were significantly associated with canopy or emergent trees or lianas that are dispersed by mammals or gravity and recruit best in small gaps. Variation in seed size, after accounting for the effects of plant height and life-form, could be explained by dispersal mode (Mabura Hill: 22%, Manu: 14%, BCI: 26%) and gap size preference (Mabura Hill: 9%, Manu: 7%, BCI: 11%). Soil type preference, analyzed only for Mabura Hill, was not associated with seed size. Mean seed size at Mabura Hill was significantly larger than at Manu or BCI. Short-term successional processes may explain the variation of seed size within sites; dispersal mode is particularly important in defining seed size selection during a the successional process. However, short-term successional processes cannot explain the variation of seed size among sites. It is suggested that this variation may be attributed to differences in the effects of larger-scale variations in soils and disturbance on seed size among the three sites.