Warming effects on morphological and physiological performances of four subtropical montane tree species
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In a downward transplantation experiment, warming stimulated growth and photosynthesis of Schima superba Gardn. et Champ., Syzygium rehderianum Merr. et Perry and Itea chinensis Hook. et Arn. via increased stomatal conductance. Warming had no effect on growth of Machilus breviflora (Benth.) Hemsl., indicating species-specific differences in response to warming.
Climate change has been shown to shift species composition and community structure in subtropical forests. Thus, understanding the species-specific responses of growth and physiological processes to warming is essential.
To investigate how climate warming affects growth, morphological and physiological performance of co-occurring tree species when they are growing at different altitudes.
Soils and 1-year-old seedlings of four subtropical co-occurring tree species (Schima superba Gardn. et Champ., Syzygium rehderianum Merr. et Perry, Itea chinensis Hook. et Arn. and Machilus breviflora (Benth.) Hemsl.) were transplanted to three altitudes (600 m, 300 m and 30 m a.s.l.), inducing an effective warming of 1.0 °C and 1.5 °C. Growth, morphological, and physiological performances of these seedlings were monitored.
When exposed to warmer conditions, aboveground growth of the four species except M. breviflora was strongly promoted, accompanied by increased light-saturated photosynthetic rate and stomatal conductance. Warming also significantly increased concentrations of non-structural carbohydrates in leaves of S. rehderianum and M. breviflora, stems of S. superba and S. rehderianum, and roots of I. chinensis. However, we did not detect any effect of warming on stomatal length and stomatal density.
Our results provide evidence that climate warming could have species-specific impacts on co-occurring tree species, which might subsequently shift species composition and forest structure.
KeywordsTransplantation Photosynthesis Growth Stomatal traits Non-structural carbohydrates
We thank the editor and the two anonymous reviewers for valuable comments.
Data availability statement
The datasets generated during and/or analyzed during the current study are not publicly available because the authors are working on another manuscript using the same dataset but are available from the corresponding author on reasonable request.
This study was jointly funded by the National Natural Science Foundation of China (31800511, 31570482 and 31670453), the Science and Technology Innovation Project of Guangdong Province Forestry (Grant No. 2019KJCX023), and the Fund of Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Chinese Academy of Sciences (DE2018028).
Compliance with ethical standards
Statement on ethical approval
We declare that this study have obtained the appropriate permissions from the responsible authorities of “Dinghushan Biosphere Reserve.”
Conflict of interest
The authors declare that they have no conflict of interest.
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