闽西北不同类型毛竹林生物量分布格局

The biomasss distribution of different Phyllostachys edulis forest types in Northwest of Fujian Province

以福建省天宝岩自然保护区的毛竹纯林（Ⅰ）、竹阔混交林（Ⅱ）和竹针混交林（Ⅲ）为研究对象,对其生物量分布格局进行研究。结果表明,不同类型毛竹林生物量和生产力不同,林分Ⅰ、Ⅱ和Ⅲ的生物量分别为143 418.06、135 469.53和131 782.78 kg.hm-2,生产力分别为59 786.55、54 921.44和38 418.68 kg.hm-2.a-1,毛竹林纯林化经营可以提高竹林的生产力。经营方式对毛竹林不同器官间生物量分配也有重要的影响,毛竹纯林竹秆质量分数明显高于混交林的质量分数,竹根质量分数低于混交林的质量分数。毛竹主要经济组分为竹秆,纯林较高的竹秆质量分数,保证了毛竹林较高的经济效益。不同类型毛竹林株数和生物量的径级分布特征不同,毛竹纯林和竹阔混交林〉49%的毛竹胸径分布在10.5~12.5 cm,生物量占整个林分的54.25%和53.71%,而竹针混交林54.90%的毛竹分布在9.5~11.5 cm,生物量占林分的54.34%,竹阔混交毛竹林具有较高的生物量和生产力,竹阔混交经营可能是一种较好的经营模式。

The distribution pattern of biomass was studied in pure bamboo stand（Ⅰ）,bamboo stand mixed with broadleaves trees（Ⅱ）,and bamboo stand mixed with coniferous trees（Ⅲ） in Yong＇an county,Fujian Prov-ince.The result showed that the biomass and productivity of bamboo forest was in the order of ⅠⅡⅢ.The biomass of Ⅰ,Ⅱ,and Ⅲ was 143 418.06,135 469.53,and 131 782.78 kg·hm-2,respectively.The productivity of Ⅰ,Ⅱ,and Ⅲ was 59 786.55,54 921.44,and 38 418.68 kg·hm-2·a-1,respectively.The productivity of pure bam-boo stand was higher than that of other bamboo forest types.The biomass distribution was different with different bamboo forests types.The stem mass fraction in pure bamboo forest was higher than the fraction in forest Ⅱ and Ⅲ,while the mass fraction of bamboo root and leaf was lower.The more economic benefits come from the higher stem mass fraction in forest Ⅰ.The characteristics of bamboo number and biomass were different in different bamboo forest types.The DBH of ⅠandⅡ forest was mainly between 10.5 cm and 12.5 cm and biomass ac-counted for 54.25% and 53.71% of forestⅠandⅡ.The DBH of Ⅲ was mainly between 9.5 cm and 11.5 cm and biomass accounted for 54.34% in forest Ⅲ.The biomass and productivity of bamboo stand mixed with broad-leaves trees was higher,meanwhile the bamboo stand mixed with broadleaves trees had better physical and chemical properties of soil and better nutrient cycling characteristics.The bamboo stand mixed with broadleaves trees may be a better cultivation pattern.