PHENOLOGY AND ECOPHYSIOLOGY OF THE TROPICAL TREE, TABEBUIA-NEOCHRYSANTHA (BIGNONIACEAE)
PHENOLOGY AND ECOPHYSIOLOGY OF THE TROPICAL TREE, TABEBUIA-NEOCHRYSANTHA (BIGNONIACEAE)
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DOI：
10.2307/1938945
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发表时间：
1982-01-01
期刊：
影响因子：
4.8
通讯作者：
BORCHERT, R
中科院分区：
文献类型：
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作者：
REICH, PB;BORCHERT, R
1978年，在哥斯达黎加瓜纳卡斯特的一片低地落叶林的几个干燥和潮湿的地点，对生长在许多新切花菊上的许多新切花菊的物候和水分胁迫的季节变化进行了监测，反映在茎周长的变化上。旱季前期落叶率与土壤水分下降和水分胁迫加剧密切相关。无一例外，开花和出苗都需要从水分胁迫中恢复。在干旱地区，复水作用只有在孤立的阵雨或灌溉后才会发生；在潮湿地区，复水作用发生在持续干旱期间，这可能是由于落叶期间蒸腾作用减少的结果。观察到开花发生在开始(12月1日)之间的任何时间。和旱季结束(5月)。开花的时间和强度以及落叶和出芽的时间的差异可以通过树木干燥和复水速率的不同以及降雨时间和强度的年际变化来解释。没有证据表明其他环境因素，如温度或光周期的变化，控制了季节发育。
Phenology and seasonal variations in water stress, as reflected in variations in stem circumference, were monitored throughout 1978 in numerous T. neochrysantha growing at several dry and wet sites in a lowland deciduous forest in Guanacaste, Costa Rica. The rate of leaf fall during the early dry season was strongly correlated with the decline in soil moisture and increasing water stress of the tress. Without exception, recovery from water stress was required for flowering and shoot emergence. At dry sites rehydration occurred only after isolated rain showers or irrigation; at wet sites it took place during continued drought, probably as a consequence of the decrease in transpiration during leaf fall. Flowering was observed to occur at any time between the beginning (Dec.) and end (May) of the dry season. Differences in the timing and intensity of flowering as well as in the timing of leaf fall and shoot emergence can be accounted for by site-dependent differences in the rates of desiccation and rehydration of trees in conjunction with year-to-year variation in the timing and intensity of rainfall. No evidence for the control of seasonal development by other environmental factors, such as variations in temperature or photoperiod, was obtained.