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大兴安岭南段山杨径向生长和死亡对区域气候变化的响应

贺敏1,魏江生1,3*,石亮1,周梅2,3,赵鹏武2,3   

  1. ( 1内蒙古农业大学草原与资源环境学院, 呼和浩特 010011;2内蒙古农业大学林学院, 呼和浩特 010019;3内蒙古赛罕乌拉森林生态系统国家级定位观测研究站, 赤峰 025150)
  • 出版日期:2018-11-10 发布日期:2018-11-10

The response of radial growth and death of Populus davidiana to regional climate change in southern Greater Xing’an Mountains.

HE Min1, WEI Jiang-sheng1,3*, SHI Liang1, ZHOU Mei2,3, ZHAO Peng-wu2,3#br#   

  1. (1College of Grassland Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, China; 2Forestry College of Inner Mongolia Agricultural University, Hohhot 010019, China; 3Inner Mongolia Saihanwula Forest Ecosystem National Positioning Observation Station, Chifeng 025150, Inner Mongolia, China).
  • Online:2018-11-10 Published:2018-11-10

摘要: 为探究气候变化是否影响半干旱区树木的生长和死亡,应用年轮气候学及相关分析方法,对内蒙古大兴安岭南段赛罕乌拉地区山杨的生长和死亡对气候变化的响应进行了研究。结果表明:1954—2012年间,研究区内的山杨径向生长与平均气温及最低气温呈负相关(P<0.05),1993年以后气温显著上升,树木径向生长出现了下降的趋势;山杨径向生长只与当年5月的降水量呈极显著正相关(P<0.01),与其他月份降水量呈正相关但相关性均不显著(P>0.05);气温升高是导致山杨径向生长量降低和死亡率增加的主导因素。

关键词: 叶片生态化学计量, 养分限制, 地形因子, 祁连山, 火绒草

Abstract: To assess the effects of global warming on tree  radial growth and massive mortality in semi-arid forests, the responses of radial growth and death of Populus davidiana to climate change were analyzed using annual climatology and correlation analysis in Saihanwula, southern Greater Xing’an Mountains, Inner Mongolia. The results showed that the radial growth of P. davidiana was significantly negatively correlated with the average temperature and minimum temperature (P<0.05). The radial growth of P. davidiana decreased when the temperature significantly increased after 1993. The radial growth had significant positive correlation (P<0.01) with precipitation in May but no such relationship with precipitation in other months. The rising temperature accelerated the reduction of radial growth and the death of P. davidiana.

Key words: leaf stoichiometry, topographical factor, Qilian Mountains, limitation nutrient, Leontopodium leontopodioides