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The role of tree size in the leafing phenology of a seasonally dry tropical forest in Belize, Central America

机译：在中美洲伯利兹，树木大小在季节性干燥热带森林的叶子物候物候中的作用

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Leafing phenology of two dry-forest sites on soils of different depth (S = shallow, D = deep) at Shipstern Reserve, Belize, were compared at the start of the rainy season (April-June 2000). Trees greater than or equal to 2.5 cm dbh were recorded weekly for 8 wk in three 0.04-ha plots per site. Ten species were analysed individually for their phenological patterns, of which the three most common were Bursera simaruba, Metopium brownei and Jatropha gaumeri. Trees were divided into those in the canopy (> 10 cm dbh) and the subcanopy (less than or equal to 10 cm dbh). Site S had larger trees on average than site D. The proportion of trees flushing leaves at any one time was generally higher in site S than in site D, for both canopy and subcanopy trees. Leaf flush started 2 wk earlier in site S than site D for subcanopy trees, but only 0.5 wk earlier for the canopy trees. Leaf flush duration was 1.5 wk longer in site S than site D. Large trees in the subcanopy flushed leaves earlier than small ones at both sites but in the canopy just at site D. Large trees flushed leaves earlier than small ones in three species and small trees flushed leaves more rapidly in two species. Bursera and Jatropha followed the general trends but Metopium, with larger trees in site D than site S, showed the converse with onset of flushing I wk earlier in site D than site S. Differences in response of the canopy and subcanopy trees on each site can be accounted for by the predominance of spring-flushing or stem-succulent species in site S and a tendency for evergreen species to occur in site D. Early flushing of relatively larger trees in site D most likely requires access to deeper soil water reserves but small and large trees utilize stored tree water in site S.
机译：在雨季开始时（2000年4月至2000年6月），比较了伯利兹Shipstern保护区不同深度（S =浅，D =深）土壤上两个干旱林地的叶片物候。每周记录8个星期内大于或等于2.5 cm dbh的树木，每个地点三个0.04公顷的地块。分别分析了十个物种的物候模式，其中三个最常见的物种是西伯尔氏酵母，Metopium brownei和Jatropha gaumeri。树木分为冠层（> 10 cm dbh）和亚冠层（小于或等于10 cm dbh）的树木。站点S的树木平均比站点D的大。对于树冠层和亚冠层树，站点S上任一时刻的冲刷树木比例通常都高于站点D。对于亚冠层树，在站点S中的叶冲洗开始于站点D的2周之前，但对于冠层树的叶冲洗开始仅早0.5周。 S部位的叶冲洗持续时间比D部位长1.5 wk。亚冠层中的大树在两个部位都比小叶片早冲洗，但D部位的冠层中。在三个物种和小物种中，大树比小叶片更早冲洗叶片树木在两个物种中更快地冲洗了叶子。 Bursera和Jatropha遵循总体趋势，但是Metopium在站点D中比站点S更大，在站点D中树木冲刷的发生要比在站点S中早发生Ww。每个站点上的冠层和亚冠层树木的响应差异可以可能是由于S地段的春季冲刷种或多肉植物种占主导地位，D地带出现常绿树种的趋势。D地较大树种的早期冲刷最有可能需要获取较深的土壤水储量，但较小大树利用站点S中存储的树木水。

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