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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (10): 3405-3414.doi: 10.13287/j.1001-9332.202110.042

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Responses of radial growth of Pinus sylvestris var. mongolica and Larix gmelinii to climate change

GUO Xue-mei1, WANG Zhao-peng2, ZHANG Nan1, ZHANG Dong-you1*   

  1. 1 Heilongjiang Provincial Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Region, Harbin Normal University, Harbin 150025, China;
    2School of Geography and Tourism, Xinjiang Normal University, Urumqi 830054, China
  • Received:2021-08-24 Revised:2021-09-27 Online:2021-10-15 Published:2022-04-15
  • Contact: * E-mail: zhangdy@163.com
  • Supported by:
    National Natural Science Foundation of China (41671064) and the Natural Science Foundation of Heilongjiang Province of China (LH2021D012).

Abstract: In the context of global warming, the increases of temperature may affect tree growth and thus disturb ecosystem balance. In this study, we explored the main limiting factors for radial growth of Pinus sylvestris var. mongolica and Larix gmelinii in the Mohe area of Greater Khingan Mountains by using growth-climate response function analysis and moving correlation analysis, as well as the interspecific difference of the responses of radial growth to rapid warming. The results showed that the radial growth of P. sylvestris var. mongolica and L. gmelinii was affected by both temperature and precipitation. P. sylvestris var. mongolica was more sensitive to climate change than L. gmelinii, and its sensitivity to climate factors was more stable than L. gmelinii. The radial growth of P. sylvestris var. mongolica was significantly positively correlated with the monthly mean temperature and the monthly mean minimum temperature of the growing season, while that of L. gmelinii was significantly positively correlated with the monthly mean temperature and the monthly mean maximum temperature of winter. Precipitation in winter promoted the growth of P. sylvestris var. mongolica, whereas precipitation in the late growing season of the previous year inhibited the radial growth of L. gmelinii. After the rapid warming in 1990, the limiting effect of precipitation on P. sylvestris var. mongolica changed from negative to significantly positive, with the inhibition effect of high temperature being greater than the promotion effect. The inhibitory effect of high temperature on L. gmelinii was enhanced, and the limiting effect of precipitation on L. gmelinii was also enhanced after heating up. The growth rate decreased significantly, with obvious difference being observed in the correlations between the growth rate of two species with temperature and precipitation. Our results could provide scientific basis for forest ecosystem management and protection in Greater Khingan Mountains.

Key words: tree ring, climate warming, radial growth, Pinus sylvestris var. mongolica, Larix gmelinii