桂东南红锥人工林生物量及分布特征

Biomass and its distribution pattern of Castanopsis hystrix plantation in southeastern Guangxi

为了解红锥人工林的生物量特征,采用径阶标准木收获法建立相对生长方程,对桂东南12年生红锥人工林的生物量及其分布特征进行了研究。结果表明:红锥人工林乔木层生物量为31.38±1.93 t·hm^(-2),净生产量为2.62±0.24 t·hm^(-2)a^(-1);生物量在各器官的分配为干(53.85%)>根(28.30%)>枝(10.57%)>皮(6.32%)>叶(0.95%),干、根为主要分配器官,两者占总生物量的82.15%;沿树干向上,干、皮生物量逐渐减少,而活枝和叶生物量则呈先增后减少的趋势,活枝、叶生物量在树干高度4~6 m段达到最大;根系生物量以根桩所占的比例最高,细根最小。

In order to understand the biomass of Castanopsis hystrix plantation, a 12 years old Castanopsis hystrix Miq. plantation has been measured by average diameter determination method. The results show that biomass of arbor layer was 31.38±1.93 t·hm-2, the net production was 2.62±0.24 t·hm-2.The distribution of biomass in organs of Castanopsis hystrix Miq. plantation was ordered as follow： stem（53.85%） root（28.3%） branch（10.57%） skin（6.32%） leaves（0.95%）, the biomass was mainly storaged in stem and root, which accounts for 82.15% of the total biomass. The biomass of stem and skin reducing with height, but the biomass of branch and leaf showed a trend of rise first then fall and reached maximum at 4-6 m. Root biomass was the highest in root piles and least in radicula.