Regional differentiation of radial growth to climate response of Chinese pine(Pinus tabulaeformis)
Pinus tabulaeformis,an endemic and widely distributed conifer in China,is widely distributed coni-fer species in China,and it is also the main afforestation species in the northern region of China.The impact of climate change on the growth of P.tabuliformis has become a hot research topic of genecology.In this study,based on the results of research on the chronology of P.tabuliformis,we systematically sorted out and analyzed the characteristics of the response of its radial growth to climatic factors under the influence of different precipita-tion,temperature,and other factors in the northern region of China.Our aim was to clarify the regional differen-tiation characteristics and provide a theoretical and decision-making basis for the management of natural and planted forests of P.tabuliformis.The results showed the following:(1)The main factor limiting the radial growth of P.tabuliformis is precipitation during the growing season.In regions with annual precipitation lower than 400 mm,hydrothermal factors in the growing season mainly influence the radial growth.In regions with an-nual precipitation of 400-600 mm,the radial growth of P.tabuliformis is mainly limited by temperature and pre-cipitation.In regions with annual precipitation higher than 600 mm,the radial growth of P.tabuliformis is mainly affected by May precipitation and temperature and their combined effect of drought stress(2)The"lagging ef-fect"of precipitation(e.g.,the previous precipitation of September)on the radial growth of P.tabuliformis is a significant factor,and it is mainly observed in regions with annual precipitation lower than 600 mm and annual mean temperatures below 9 ℃.(3)Winter temperature promotes the growth of P.tabuliformis in regions with an-nual precipitation higher than 600 mm and annual mean temperatures higher than 9 ℃.However,it inhibits the growth in regions with annual precipitation lower than 600 mm and annual mean temperatures lower than 9 ℃.Under the climatic background of global warming,the distribution of P.tabuliformis is likely to shift from arid and semi-arid regions to relatively humid regions and from low to high altitudes.
万方数据
维普
