Nath Shikhasmita, Nath Arun Jyoti, Das Ashesh Kumar
J Environ Biol. 2016 Mar;37(2):215-20.
Vegetative and reproductive phenology of Barringtonia acutangula, a floodplain tree species was studied at Chatla floodplain, Assam North East India with the aim to investigate vegetative and reproductive phenology under stressful environment of seasonal submergence and to assess the impact of environmental variables (temperature and precipitation) on tree phenophases. Quantitative assessment was made at 15 day interval for all the phenophases (leaf initiation, leaf-fall, flowering and fruiting) by tagging 40 (forty) trees over aperiod of two years (2012-14).To test seasonal influence on the phenology of Barringtonia acutangula different phenophases were correlated with environmental variables and statistical spearman's rank correlation coefficient was employed. Aridity index was computed that delineate influence of rainfall and temperature together on any phenophases. Leaf initiation showed positively significant correlation with temperature (r(s) = 0.601, p = < .05) during the year 2012-2013 whereas it was significantly correlated with rainfall (r(s) = 0.583, p = < .05) and aridity index (r(s) = 0.583, p = < .05) during the year 2013-2014. Leaf-fall was significant negatively correlated with temperature (r(s) = -0.623, p = < .05), rainfall (r(s) = -0.730, p = < .01) and aridity index (r(s) = -0.730, p = < .01) for both the studied years. Flowering was significantly influenced by temperature (r(s) = 0.639, p = < .05), rainfall (r(s) = 0.890, p = < .01) and aridity index (r(s) = 0.890, p = < .01) while in one month lag flowering was significantly correlated with rainfall (r(s) = 0.678, p = < .01) in 2012-13. Fruiting was also positively significant with temperature (r(s) = 0.795, P < .05), rainfall (r(s) = 0.835, P < .01) and aridity index (r(s) = 0.835, P < .01) for both the years. During one month lag period fruiting was positively correlated with temperature, rainfall and aridity index in both the years. Temperature, rainfall and aridity index were major determinants of the various vegetative and reproductive phenology of B. acutangula and any changes in these variables in future due to climate change, might have profound effect on phenophases of this tree species.
在印度东北部阿萨姆邦的查特拉洪泛平原，对洪泛平原树种尖叶巴豆的营养和生殖物候进行了研究，目的是调查季节性淹没的压力环境下的营养和生殖物候，并评估环境变量（温度和降水）对树木物候期的影响。在两年（2012 - 2014年）的时间里，通过标记40棵树，每隔15天对所有物候期（叶芽萌动、落叶、开花和结果）进行定量评估。为了测试季节对尖叶巴豆物候的影响，将不同的物候期与环境变量进行关联，并采用统计斯皮尔曼等级相关系数。计算了干旱指数，以描述降雨和温度共同对任何物候期的影响。在2012 - 2013年期间，叶芽萌动与温度呈显著正相关（r(s) = 0.601，p = <.05），而在2013 - 2014年期间，它与降雨量（r(s) = 0.583，p = <.05）和干旱指数（r(s) = 0.583，p = <.05）显著相关。在两个研究年份中，落叶与温度（r(s) = -0.623，p = <.05）、降雨量（r(s) = -0.730，p = <.01）和干旱指数（r(s) = -0.730，p = <.01）均呈显著负相关。开花受到温度（r(s) = 0.639，p = <.05）、降雨量（r(s) = 0.890，p = <.01）和干旱指数（r(s) = 0.890，p = <.01）的显著影响，而在2012 - 13年，延迟一个月的开花与降雨量显著相关（r(s) = 0.678，p = <.01）。在这两年中，结果与温度（r(s) = 0.795，P <.05）、降雨量（r(s) = 0.835，P <.01）和干旱指数（r(s) = 0.835，P <.01）也呈显著正相关。在两年的延迟一个月期间，结果与温度、降雨量和干旱指数均呈正相关。温度、降雨量和干旱指数是尖叶巴豆各种营养和生殖物候的主要决定因素，未来由于气候变化这些变量的任何变化，可能会对该树种的物候期产生深远影响。
