[Drought tolerance traits of leaves of 20 tree species in temperate forest of Northeast China].

Ying Yong Sheng Tai Xue Bao

Center for Ecological Research/Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management, Northeast Forestry University, Harbin 150040, China.

Published: January 2022

AI Article Synopsis

  • Increased drought frequency and intensity globally is negatively impacting tree growth and causing widespread forest mortality, with leaf traits providing insights into trees' drought tolerance.
  • The study assessed five pressure-volume (PV) traits and two leaf structural traits in 20 tree species in Northeast China to identify the best indicators of leaf drought tolerance and their correlations with structural traits.
  • Results showed that angiosperms exhibited higher relative water content (RWC) and differences in correlations between traits compared to gymnosperms, suggesting that RWC and certain PV traits could serve as effective indicators of drought tolerance in this temperate forest.

Article Abstract

The increases in frequency and intensity of drought worldwide has seriously affected tree growth, and even led to widespread forest mortality. Leaf traits estimated from pressure-volume (PV) curve provide key leaf physiological information that reflects the drought tolerance of trees. However, it is uncertain that which PV parameter performs the best at local scale. Here, we measured five PV traits (including TLP, π, , , and RWC) and two leaf structural traits (specific leaf area and leaf density) in 20 tree species (16 angiosperms and 4 gymnosperms) in a temperate mixed forest at the Maoershan Forest Ecosystem Research Station, Northeast China. The objectives of this study were to search the best indicators of leaf drought tolerance at local scale, and to explore the correlation between PV traits and leaf structural traits. We found that angiosperms had significantly greater RWC and lower than gymnosperms, indicating that RWC and might be the good indicators of leaf drought tolerance in temperate mixed forest in Northeast China. Within angiosperm species, TLP and π were significantly and negatively correlated with leaf density, but positively correlated with specific leaf area; while was negatively correlated with specific leaf area. However, the opposite trends between PV traits and leaf structural traits were observed between gymnosperms and angiosperms, which might be attributed to their differences in drought response and adaptation strategies.

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http://dx.doi.org/10.13287/j.1001-9332.202201.003DOI Listing

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