Comparison of COFECHA and TSAPWIN from dendroclimatology for climate change and taiwan fir (abies kawakamii) growth pattern in alpine central Taiwan

Many tree ring researches have worldwide revealed that climate change influence tree growth pattern in alpine tree-line, but it is still lack of these research in Taiwan. From central Taiwan Mt. Hehuan alpine tree-line Taiwan fir (Abies kawakamii H.) dendroclimatic analysis, we found the relationships of ring width and BAI growth with climate change in 1953-2010. Tree ring width and BAI growth were highly significant correlated to standard chronology, residual chronology and autoregressive chronology, it responded most similar climate signal at the same periods, and tree ring width standard chronology reflected most climate signals. Tree ring width and BAI growth responded temperature decreasing correlation in February, March, April of early spring, it reflected that the later summer temperature increasing correlation in August, September and October, at the same time monthly temperature and season temperature reflect synchrony of most part. Tree ring width and BAI growth reflected monthly accumulated precipitation increasing correlation in January and March, and reflected August and November monthly accumulated precipitation decreasing correlation. It is understand that early spring low temperature with increasing precipitation and later summer high temperature with decreasing precipitation promoted Taiwan fir to grow. The average temperature of recent 60 year later summer (August, September, and October) has increasing trend l'C. The increasing trend of BAI growth was as same as mean temperature in later summer, it had a high linear correlation. Later summer temperature increasing and warming promoted to grow, the research found that the increasing temperature in early spring would suppress the growth. And, the relationship establishment of tree ring width and BAI growth, climate change would help to understand how climate warming influence tree growth pattern in alpine forest tree-line.