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作者

Ming Liu;Ulrich Pietzarka;Matthias Meyer;Britt Kniesel;Andreas Roloff

来源

URBAN FORESTRY & URBAN GREENING,Vol.73,Issue1,Article 127592

语言

英文

关键字

Drought tolerance;Ring-porous species;Anisohydric species;Leaf turgor loss point;Climate change

作者单位

College of Architecture, Nanjing TECH University, Puzhu South Road 30, 211816 Nanjing, China;Institute of Forest Botany and Forest Zoology, TU Dresden, Pienner Str. 7, 01737 Tharandt, Germany;College of Architecture, Nanjing TECH University, Puzhu South Road 30, 211816 Nanjing, China;Institute of Forest Botany and Forest Zoology, TU Dresden, Pienner Str. 7, 01737 Tharandt, Germany

摘要

In recent years, Central European forests and trees have been severely suffered from drought events in the growing season. To examine the tree growth response to drought stress, measurements of annual shoot lengths (ASL) of various tree species with distinct ages and habitats were taken in southeast Germany. The index of relative ASL increase (RAI), which is a standardized ASL increase, was calculated to indicate the growth rate of various tree species between the non-drought (2015–2017) and the drought period (2018–2020). The results showed the ASLs of most early-young trees (< 10 years) significantly showed a decreasing tendency in the drought period, whereas the middle-young (11–15 years) and late-young trees (> 16 years) presented a relatively stable trend. The ring-porous species with anisohydric behavior were likely to have higher RAIs associated with higher drought tolerance than diffuse-porous species with isohydric behavior. However, tree growth rate did not correlate with drought tolerance (resistance) of tree species indicated by leaf turgor loss point (Ψtlp, MPa). Therefore, this study suggested parameters, such as growth rate, age phases, and microhabitats, should be considered to predict tree species’ drought tolerance other than Ψtlp. Finally, we emphasized tree shoot growth responses to drought were affected by multiple internal and external factors, and strongly depended on species- and site-specific characteristics, such as age phases, xylem structure, hydraulic strategy, microhabitat, grafting effect, and competition. ASL measurement can be recommended to be an easy, fast, and effective method to detect tree growth rate and response to environmental stress.