Journal of Plant Ecology ›› 2021, Vol. 14 ›› Issue (3): 465-477.DOI: 10.1093/jpe/rtab004

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  • 收稿日期:2020-05-01 修回日期:2020-07-13 接受日期:2020-12-12 出版日期:2021-06-01 发布日期:2021-03-25

Drivers of understorey biomass: tree species identity is more important than richness in a young forest

Markus S. Germany1,2,3,*, Helge Bruelheide2,3 and Alexandra Erfmeier1,3   

  1. 1 Department of Geography, Kiel University, Institute for Ecosystem Research/Geobotany, Kiel, Germany, 2 Department of Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Institute of Biology/Geobotany and Botanical Garden, Halle, Germany, 3 German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany

    *Corresponding author. E-mail:
  • Received:2020-05-01 Revised:2020-07-13 Accepted:2020-12-12 Online:2021-06-01 Published:2021-03-25

摘要: 林下生物量影响因素:幼龄林树种特性比丰富度更重要

关键词: BEF-China, 亚热带森林, 树种丰富度和特性, 生产力, 时间



Positive biodiversity–ecosystem functioning relationships have been widely reported, predominately from grassland ecosystems. However, this does not necessarily have to apply accordingly in more complex situations such as in forests across different vertical strata. For instance, overstorey tree species richness has been shown to be associated with a lower understorey productivity. Whether or not tree species richness effects add to understorey productivity by increasing (i.e. due to habitat heterogeneity) or reducing resource availability (i.e. through increasing competition) and whether understorey productivity is indeed being governed more strongly by tree species identity are likely to change over time. Moreover, studies also suggested that richness–productivity relationships change with the environmental context. Using an experimental forest plantation with manipulated tree species richness, this study examined these temporal and environmental dynamics across strata.


In the context of the Biodiversity-Ecosystem Functioning project in subtropical China (BEF-China), we made use of understorey biomass samples repeatedly collected over a time period of 3 years along a tree species richness gradient. The effects of tree species richness, tree species identities and time were studied across different environmental treatments for their impact on understorey biomass.

Important Findings

While we found significant and consistent tree layer identity effects on understorey biomass, no such effect was encountered for tree species richness. Our results also indicate that among structural layers in forests, there might not be a single, generalizable overstorey species richness–understorey productivity relationship, and that the extent as to which overstorey-related environmental factors such as light transmittance contribute to understorey productivity change with time. Overall, we demonstrate that temporal dynamics should be considered when studying relationship among structural layers in forests.

Key words: BEF-China, subtropical forests, species richness and identity, productivity, time