Seedling Growth and Biomass Production under Different Light Availability Levels and Competition Types

编号 010031405

推送时间 20211025

研究领域 森林生态 

年份 2021 

类型 期刊 

语种 英语

标题 Seedling Growth and Biomass Production under Different Light Availability Levels and Competition Types

来源期刊 forest

期 第314期

发表时间 20210924

关键词 shade tolerance;  growth allocation;  mixture effect;  competition;  pot experiment; 

摘要 Light availability is a crucial resource determining seedling survival, establishment, and growth. Competition for light is asymmetric, giving the taller individuals a competitive advantage for obtaining light resources. Species-specific traits, e.g., shade tolerance, rooting depth, and leaf morphology, determine their strategical growth response under limited resource availability and different competitive interactions. We established a controlled pot experiment using European beech, Norway spruce, and Douglas fir seedlings and applying three different light availability levels—10%, 20%, and 50%. The experiment’s main aim was to better understand the effects of light availability and competition type on the growth, growth allocation, and biomass production of recently planted seedlings. We planted four seedlings per pot in either monocultures or mixtures of two species. Relative height and diameter growth and aboveground woody biomass of seedlings increased with increasing light availability. All seedlings allocated more growth to height than diameter with decreasing light availability. Seedlings that reached on average greater height in the previous year allocated less growth to height in the following year. Additionally, there were general differences in growth allocation to the height between gymnosperms and angiosperms, but we did not find an effect of the competitor’s identity. Our mixture effect analysis trends suggested that mixtures of functionally dissimilar species are more likely to produce higher biomass than mixtures of more similar species such as the two studied conifers. This finding points towards increased productivity through complementarity. View Full-Text

服务人员 王璐

服务院士 蒋有绪

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