Tree phenology in a tropical montane forest in Rwanda
Tree phenology in a tropical montane forest in Rwanda
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DOI：
10.2307/2389053
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发表时间：
1996-12-01
期刊：
影响因子：
2.1
通讯作者：
Moermond, TC
中科院分区：
文献类型：
--
作者：
Sun, C;Kaplin, BA;Moermond, TC
1991年1月至1993年1月，在卢旺达的一片山地森林中，对49种568株产肉果的树木的物候学进行了研究。结果在3-5月的主要雨季达到高峰，但在7-8月的主要旱季保持较高水平。次旱期在每一历年开始时出现一个减果期，7-8月是主要旱季，而开花在每一历年开始时达到高峰。这些观察结果与“日照限制假说”预测的一般模式不一致，该假说认为热带森林群落范围内的开花和落叶在时间上应该密切相关，两个物候期都在最强烈的日照期间达到顶峰。当物种按种子大小进行分组时，大种子组的果实丰度在时间上的变化(更大的结果季节性)比小种子组大。然而，当单独检查物种时，种子大小与结果持续时间或种内结果同步性无关，这两个属性决定了物种结果的季节性程度。一群犀牛表现出的结果模式不能用组成该群的物种的属性来解释。不同种子大小的群体表现出不同程度的结实季节性，可能是由于组内种间结实同步性程度不同所致。
The phenology of 568 trees of 49 species producing fleshy fruits was studied in a montane forest in Rwanda between January 1991 and January 1993. Fruiting peaked during the major wet season in March-May, bur remained high during the major dry season in July-August. A period of reduced fruiting occurred in the beginning of each calendar year during the minor dry period.Leaf flushing peaked during the major dry season in July-August, whereas flowering peaked in the beginning of each calendar year. These observations were inconsistent with the general pattern predicted by an ''insolation-limitation hypothesis'' that community-wide flowering and leaf flushing in tropical forests should be closely related in time and that both phenophases reach their peaks during the period of the most intense insolation.When species were grouped by seed size, the large-seeded group displayed a greater temporal variation in fruit abundance (greater fruiting seasonality) than the small-seeded group. When species were examined individually however, seed size was not related to either fruiting duration or within-species fruiting synchrony, two attributes determining the degree of fruiting seasonality of a species. Fruiting patterns manifested by a group rhus could not be explained by attributes from species constituting the group. Different degrees of fruiting seasonality displayed by different seed-sized groups may be due to different degrees of within-group interspecific fruiting synchrony.