长白落叶松人工林年轮宽度对气候变化的响应.

To reveal the response degree of ring width for earlywood, latewood, and ringwood of Larix olgensis plantation to climate change, 135 sample trees from 27 sample plots in Maoershan Experimental Forest Farm of Northeast Forestry University were taken as data sources, based on the establishment of tree ring chronology, the correlation analysis was used to quantify the relationship between ring width earlywood, latewood, and ringwood and climate factors. Results showed that the ring width of L. olgensis can be divided into two distinct time periods on the time scale. During 1974-1985, the tree growth was mainly affected by the temperature in spring and autumn, while from 1986 to 2019, it was mainly affected by the temperature in summer. During 1974-1985, the highest and lowest temperaturesin winter and spring, especially in January, February, April and May of the previous year and that year, had a negative correlation (P<0. 05) with the growth of earlywood and ringwood, but a positive correlation with the growth of latewood (P<0. 05). The period in April and May of the previous year and the spring of that year had a negative correlation with the growth of ring width of earlywood (P<0. 05). From 1986 to 2019, the highest and lowest temperatures in summer, especially in June and July of the previous year and that year, had a significant positive correlation with the ring width of latewood (P<0. 05). The average temperature in summer, especially in July of the previous year and that year, had a significant positive correlation with the growth of latewood (P<0. 05), but a significant negative correlation with the growth of ring width of earlywood and ringwood (P<0. 05). On the whole, the temperature in the growing season, especially the minimum temperature and average temperature, are the main factors limiting the growth of earlywood and latewood of L. olgensis plantation, the effect of precipitation on the growth ofearlywood and latewood is not significant. [ABSTRACT FROM AUTHOR]