不同地位指数不同密度杉木人工林生产力的比较

基于14与16地位指数条件下杉木人工林生产力的调查资料,用空间代替时间的方法,研究8、16、23年生杉木人工林生产力随地位指数与林分密度的变化规律.结果表明,不同地位指数杉木人工林生物量随年龄增长的变化趋势大致相同,但16地位指数杉木林各器官生物量在各个年龄段均高于14地位指数.若以单株生物量为目的,14地位指数立地造林的初植密度宜比16地位指数林分低200株.hm-2左右;若以林分总蓄积量为目的,则14地位指数立地的初植密度宜比16地位指数林分多700株.hm-2左右.在14地位指数立地上造林可考虑提高初植密度以期获得最大的林分总蓄积量,而在16地位指数立地上造林则应选择较小的初植密度以获得优质干材.

Study on the biomass ptoductiVity and growth Of Chinese fir plantatiOilS of diflIerent site and density

Based on study materials of biomass research in two kinds of site condition of 8,16 and 23 years′ Chinese fir plantation,the alterations of biomass and productivity with site condition and plant density were studied.Spatial information was used instead of temporal information,and obtained the main results as follows: different stands have a similar tendency of biomass changed with the age increase,but biomasses of all parts of Chinese fir plantations on the good site were higher than that on low site index condition in all ages.Taking the individual plant biomass as forestation destination,the initial planting density on poor sites should be 200 plants·hm-2 lower than that on high sites.But taking the stand volume as assessment index,the initial planting density on poor sites should be 700 plants·hm-2 higher than that on high sites.Forestation on poor sites should increase initial planting density to get the maximum stand volume.However,forestation on good sites should choose lower initial planting density to achieve higher quality timber.