Welcome to Chinese Journal of Applied Ecology! Today is Share:

Chinese Journal of Applied Ecology ›› 2023, Vol. 34 ›› Issue (1): 11-17.doi: 10.13287/j.1001-9332.202301.009

• Original Articles • Previous Articles     Next Articles

Effects of field soil warming on the growth and physiology of Juglans mandshurica seedlings

YU Xin-lei1,2,3, YUAN Jun-feng2,3,4,5,6, LIU Dong-wei2,3,4,6, CHEN Jin-hui7,8, YAN Qiao-ling1,2,3,4,6*   

  1. 1School of Life Sciences, Liaoning University, Shenyang 110036, China;
    2Qingyuan Forest CERN, Chinese Academy of Sciences, Shenyang 110016, China;
    3Qingyuan Forest, National Observation and Research Station, Liaoning Province, Shenyang 110016, China;
    4CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
    5University of Chinese Academy of Sciences, Beijing 100049, China;
    6Liaoning Province Key Laboratory of Terrestrial Ecosystem Carbon Neutrality, Shengyang 110016, China;
    7School of Public Policy and Management, Tsinghua University, Beijing 100084, China;
    8High-Tech Research and Development Center, Ministry of Science and Technology, Beijing 100044, China
  • Received:2022-07-22 Revised:2022-11-03 Online:2023-01-15 Published:2023-06-15

PDF (PC)

206

Abstract: Global climate change will increase surface soil temperature, with consequences on plant seedling growth and population dynamics. In this study, we carried out a field experiment to investigate the effects of 2 ℃ soil warming on the growth and physiological characteristics of 1- and 2-year-old seedlings of a dominant tree species in broadleaved Korean pine forest, Juglans mandshurica. The results showed that soil warming significantly increased basal diameter, root length, total leaf area, leaf dry weight, root dry weight, total biomass, apparent photosynthetic electron transfer rate (ETR), PSⅡ actual photochemical efficiency (ΦPSⅡ), and apparent photosynthetic electrophotochemical quenching coefficient (qP) of 1-year-old seedlings by 18.3%, 66.7%, 94.4%, 105.9%, 95.8%, 37.8%, 89.5%, 100.0%, and 71.4%, respectively. Soil warming significantly increased basal diameter, total leaf area, leaf dry weight, total biomass, leaf superoxide dismutase activity, peroxidase activity, catalase activity and free proline content, ETR, ΦPSⅡ, and qP of 2-year-old seedlings by 12.5%, 180.5%, 97.3%, 42.5%, 23.9%, 20.4%, 14.9%, 20.7%, 66.7%, 283.3% and 284.6%, respectively. There was an interaction between seedling age and soil warming on the root-shoot ratio and the ΦPSⅡ and qP in chlorophyll fluorescence parameters, in that soil warming significantly reduced the root-shoot ratio of 2-year-old seedlings and that the increase of chlorophyll fluorescence parameters of 2-year-old seedlings (4.1-4.6 times) was much higher than that of 1-year-old seedlings (1.5-1.8 times). Soil warming of 2 ℃ was beneficial to the growth of 1- and 2-year-old J. mandshurica seedlings and increased their regeneration potential. In particular, 2-year-old J. mandshurica seedlings responded to soil warming by increasing leaf area, improving leaf photochemical efficiency, and enhancing protective enzyme activity to increase resistance.

Key words: biomass, leaf area index, antioxidant substance, chlorophyll fluorescence parameter.