【摘要】 面上和点上对比分析结果表明 :1 .天然阔叶林的生产能力比人工马尾松林、人工阔叶林大得多 ;虽单位面积蓄积量小于人工杉木林 ,但单位面积生物量与人工杉木相近 ;2 .天然阔叶林除能提供种类繁多的珍贵用材外 ,还可提供人工林所无法提供的丰富多样的非木质产品 ;3 .考虑到人工林的地力衰退 ,天然阔叶林生产能力的维持明显优于人工林。更多还原

【Abstract】 Comparison in landscape and stand level shows:(1) In landscape level,the volume per unit area of Chinese fir plantation at 20 years is respectively 3.00 and 1.68 times of that of natural broad_leaved forest(NBF) in Shunchang county and Fujian province, but is only respectively 1.3 and 0.83 times in biomass per unit area.The volume per unit area of Pinus massoniana plantation at 20 years is respectively 86 % and 68 % of that of NBF in Shunchang county and Fujian province,and is only respectively 39 % and 31 % in biomass per unit area.The volume and biomass per unit area of broad_leaved plantation at 20 years are about half of that of NBF in Fujian province.Therefore,the productive capacity of NBF is much higher than Pinus massoniana and broad_leaved plantation.It is less than Chinese fir plantation in volume per unit area,but similar in biomass per unit area.(2) Comparison between NBF and Chinese fir plantation in the same site,pre_felling and age (3～18 years) shows:The mean volume increment of NBF is less than that of Chinese fir plantation,the variation is most remarkable.The mean stem biomass increment of NBF is higher than that of Chinese fir plantation,but the variation isn’t remarkable.The mean increment of biomass above ground of NBF is higher than that of Chinese fir plantation,the variation is remarkable.The result in stand level is similar to that in landscape level.(3) Beside varied timbers,NBF can provide varied non_timber forest products such as edible fruits abundant in starch,edible wild fruits,precious medicinal plants and edible wild mashroom which man_made forest can’t provide.(4) The function of maintenance of productive capacity of NBF is much better than man_made forest considering about the soil degradation.更多还原