The Response Of Radial Growth And Death Of Populus Davidiana To Regional Climate Change In South Greater Xing'an Mountains

In order to verify the hypothesis that there is a high correlation between forest deaths and climate warming in this region,the annual ring climatology and related analysis methods are applied to the growth and death of Populus simonii in Saihanwula area in the southern part of Daxinganling Mountains in Inner Mongolia.And the results of studies on the response of different forest patches to climate change show that:1.The growth of Populus davidianus appeared opposite to the increase of temperature after 1993,showing a decline.In recent years,broad-leaved tree species have been found dead in the area,and elevated temperatures have been found to accelerate the radial growth decline and death of Populus tremuloides.2.(1)The trends of radial growth and BAI of large and small forest patches are the same,and they all show a downward trend after sudden temperature changes.The growth of poplars in large forest patches is greater than that of forest poplars.(2)In the diameter-scale ratio,the small-scale forest patches have smaller overall diameters and smaller diameter-size trees,and the tree species are mainly poplars.The tree species are relatively single,and large forest patches are relatively small.For forest patches,the distribution of diameters is relatively uniform,and there are many species of trees.(3)In the accumulative survival rate,the cumulative survival rate of Populus davidiana has a sudden increase in regional air temperature,the threat of drought stress,and the dramatic changes in small forest patches,while large patches have a buffer against climate change.(4)Large forest patches are greatly influenced by climatic factors,and small forest patches are less affected by climatic factors.