恩施地区是我国杉木分布偏北的地带,境内地形复杂,高差悬殊,气候具有明显的垂直差异,杉木生产力也各不相同。低山(海拔500—800米)和中山(又称二高山,海拔800—1200米)杉木平均地位指数为14米,高山(海拔1200米以上)杉木平均地位指数为11.05米,经t值检验,t_计=8.16>t_(0.05)=1.96,差异显著,因此将海拔500—1200米作为杉木主要产 Enshi area is China’s north distribution of the cedar, the territory of complex terrain, elevation disparities, the climate has obvious vertical differences, fir productivity varies. The average status index of lowland (500-800 meters above sea level) and Zhongshan (also known as the second high mountain and 800-1200 meters above sea level) is 14 meters. The average index of the status of Chinese fir in the high mountains (above 1200 meters above sea level) is 11.05 meters, , t_count = 8.16> t_ (0.05) = 1.96, the difference is significant, so the elevation of 500-1200 meters as the main production of Chinese fir