A trait-based trade-off between growth and mortality: evidence from 15 tropical tree species using size-specific RGRs

A life-history trade-off between low mortality in the dark and rapid growth in the light is one of the most widely accepted mechanisms underlying plant ecological strategies in tropical forests. Differences in plant functional traits are thought to underlie these distinct ecological strategies; however, very few studies have shown relationships between functional traits and demographic rates within a functional group. We present 8 years of growth and mortality data from saplings of 15 species of Dipterocarpaceae planted into logged-over forest in Malaysian Borneo, and the relationships between these demographic rates and four key functional traits: wood density, specific leaf area (SLA), seed mass, and leaf C:N ratio. Species-specific differences in growth rates were separated from seedling size effects by fitting nonlinear mixed-effects models, to repeated measurements taken on individuals at multiple time points. Mortality data were analyzed using binary logistic regressions in a mixe...

弱光下低死亡率与强光下快速生长之间的生活史权衡，是支撑热带雨林植物生态策略的最广为接受的机制之一。植物功能性状的差异被认为是这些差异化生态策略的内在基础；然而，鲜有研究在同一功能类群中揭示功能性状与种群动态速率之间的关联。本研究采集了马来西亚婆罗洲地区采伐迹地中定植的15种龙脑香科（Dipterocarpaceae）幼树的8年生长与死亡率数据，并揭示了这些种群动态速率与四项关键功能性状的关联：木材密度（wood density）、比叶面积（specific leaf area, SLA）、种子质量（seed mass）以及叶片碳氮比（leaf C:N ratio）。通过对多个时间点下个体的重复观测数据拟合非线性混合效应模型，我们将物种特异性生长速率差异与幼苗大小效应分离开来。死亡率数据则采用混合[原文未完整表述]的二元逻辑回归进行分析。