论文部分内容阅读
杉木是我国特有的用材树种,它速生、质优、用途广、产量高。杉木生产受立地条件和气候条件的影响。作者在“六五”对本地区森林资源清查时,对不同海拔高度的树干样木定期测量和解析,并通过统计分析,进一步论证了在亚热带丘陵山区海拔800米左右为杉木林生产的临界高度,常年年平均气温16℃左右,1月气温4—10℃,年降水量1400mm左右,昼夜温差小,雾日多,霜雪少,土壤疏松、
Chinese fir is a unique timber species, it is fast-growing, high quality, wide use, high yield. Cedar production is affected by site conditions and climatic conditions. In the “Sixth Five-Year Plan” period, the author regularly surveys and analyzes trunks-like wood at different altitudes during the inventory of forest resources in the region. Through statistical analysis, the author further demonstrates that the critical height for the production of Chinese fir plantation is about 800 meters above sea level in subtropical hilly mountains, The average annual temperature is about 16 ℃, January temperature 4-10 ℃, the annual rainfall of about 1400mm, small temperature difference between day and night, more fog days, less frost and snow, loose soil,