Abstract: This paper studied the phenological characters of Leymus chinensis,a dominant species in Inner Mongolia steppe,and its responses to climate factors.The results showed that the leafing of L.chinensis was significantly correlated with the average temperature from March to April,and would be advanced by 4.35 days when the temperature raised 1 ℃.Leaf coloring had a significant correlation with sunlight hours.With increasing sunlight hours,the leafing date of L.chinensis would be deferred,while the coloring date would be advanced.The growth season length of L.chinensis was closely correlated with the average wind speed from April to October.The stronger the average wind speed,the longer the growth season.

Key words: Chinese fir thinning wood, Compression, Physical-mechanical quality, Microstructure