热带季节性湿润林苦楝径向生长季节动态及其对(4) - 热带地理杂志社投稿

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热带季节性湿润林苦楝径向生长季节动态及其对(4)

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4 结论

本研究利用高精度生长仪连续两年监测了西双版纳石灰岩山的热带季节性湿润林苦楝的径向生长动态。由于年际间气候存在差异,苦楝生长开始、结束以及持续生长的时间在不同年份之间存在较大差异。苦楝的径向生长与降水和相对湿度呈正相关关系,与光合有效辐射、水汽压亏缺和风速呈负相关关系,表明了在热带石灰岩生境树木的径向生长受到了水分的限制。在极端干旱的年份(2019年),热带季节性湿润林苦楝的径向生长开始时间较晚,可能因为水分供应不足导致的木质部细胞分化延迟所致。在气候变暖和区域干旱化的背景下,热带石灰岩生境植物可能面对更为严重的干旱胁迫,结合径向生长监测、形成层活动和树木光合水分生理测定,有望进一步评估热带季节性湿润林植物的生长策略和适应性。楝科植物多具有清晰的年轮,且在东南亚热带地区广泛分布,在热带树木年轮研究中具有较好的价值,本文的研究结果可为深入认识热带地区树木生长的季节动态和气候敏感性提供参考。

致谢：感谢马宏和谭美毅在野外试验中提供的帮助。感谢中国科学院西双版纳热带雨林生态系统研究站提供的气象数据。

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