Abstract:

Under the trend of climate warming and drying,the study on response of forest management tree species to climate change helps contribute to the development of adaptive management technologies and to the reaction to climate change.Natural Larix principis-rupprechtii trees were selected to establish the tree ring width chronology at Longtoushan Forest Farm in Weichang County.Correlation analysis,Mann-Kendall test and stepwise regression were used to analyze the response of radial growth of Larix principis-rupprechtii to climate change.The results indicated that:(1)The temperature in the region has increased significantly with an abrupt change in 1980,and the precipitation has decreased with an unobvious trend for nearly 60 years.(2)The radial growth of Larix principis-rupprechtii was jointly affected by temperature and precipitation,and had significantly negative correlation with most temperature factors and significantly positive correlation with most precipitation factors.The precipitation in March and April was an important limiting factor for radial growth in this region.(3)There was significant negative correlation between extreme high temperature and radial growth in the growing season.The wetness index was significantly positively correlated with radial growth.(4)The prediction model of tree ring width growth was constructed using average temperature of current growing season,total precipitation in March and April,and wetness index as independent variables.It was found that the radial growth of Larix principis-rupprechtii would become slower with the warmer and drier climate.

Key words: Larix principis-rupprechtii, climate change, radial growth, chronology, Weichang county