不同年龄兴安落叶松单木径向生长对气候变化的响应OA北大核心CSTPCD

Quantifying the relationship between radial growth of Larix gmelinii(Rupr.)Kuzen of different ages and climatic fac-tors,and provide decision making basis for adaptive management and management of natual Larix gmelinii(Rupr.)Kuzen forests.Therefore,based on the data of 159 Larix gmelinii(Rupr.)Kuzen.from Pangu Forest Farm of Tahe Forestry Bureau in Heilongjiang Province in 2022,this study adopted the method of systematic cluster method to divide the trees into young-age,middle-age and old-age group based on tree age.Then,using dendrochronology,standard chronology was established to analyze and compare the relation-ship between radial growth of trees of different age groups and climate factors,and multiple stepwise regression method was used to construct the prediction model of single tree radial growth sensitive to climate.The results showed that:1)The total sample explana-tory weight(EPS),mean sensitivity(MS)and signal-to-noise ratio(SNR)of the(total group,old-age group,middle-age group,and young-age groups)were higher,which indicated that the standard chronology of Larix gmelinii(Rupr.)Kuzen retained abundant cli-mate information.2)The main limiting factors for radial growth of Larix gmelinii(Rupr.)Kuzen were temperature in August of the current year,temperature from August to October of the previous year,and precipitation in February and July of the current year,and in July and December of the previous year.3)There were significant differences in the response of Larix gmelinii(Rupr.)Kuzen to climate factors in different age groups.The radial growth of old-age Larix gmelinii(Rupr.)Kuzen was affected not only by the summer temperature of the current year but also by the summer temperature and precipitation of the previous year,showing a significant lag ef-fect,while the young and middle age Larix gmelinii(Rupr.)Kuzen were less affected by environmental factors.