11年生香梓楠人工林的生物量及生产力研究

Study on Biomass and Productivity of 11-year-old Michelia hedyosperma Plantation

2012年12月,通过对广西国营高峰林场界牌分场11年生香梓楠人工林进行调查,采用收获法测量其生物量和生产力。结果表明:香梓楠单株生物量随着胸径的增长而增加,不同径阶单株植物的生物量差异明显,其生物量在各器官上的分配为树干>根蔸>枝条>树皮>叶>粗根>中根>细根,呈现一致的规律,地上部分生物量与地下部分生物量之比为3.5︰1;香梓楠人工林总生物量为85.58 t·hm-2,其中乔木层的生物量为82.05 t·hm-2,林下植被的生物量为3.53 t·hm-2,分别占总生物量的95.88%和4.12%,各层之间生物量的分配规律为乔木层>凋落物层>草本层>灌木层。林分的平均生产力为11.21 t·hm-2·a-1,乔木层为9.45t·hm-2·a-1,占林分总生产力的84.26%,林下植被层为1.76 t·hm-2·a-1,占总生产力的15.74%,林分中生产力在各层中的分配规律大小依次为乔木层(9.45 t·hm-2·a-1)>凋落物层(1.17 t·hm-2·a-1)>草本层(0.48 t·hm-2·a-1)>灌木层(0.12 t·hm-2·a-1)。

The biomass and productivity of 11-year-old Michelia hedyosperma plantation, which planted in Jiepai branch of Guangxi Gaofeng forestry farm, were studied by sample tree harvesting method in Dec. of 2012. The re- sult showed that biomass of Michelia hedyosperma plantation was increased with the increasing of DBH, the differ- ence of individual biomass in different diameter classes was significant, the biomass allocation in different organs showed consistent rule, and the order was ： trunk 〉 root stump 〉 branch 〉 bark 〉 leaf 〉 big root 〉 middle root 〉 small root, the ratio of above ground biomass and underground biomass was 3.5 ： 1. The total biomass of Michelia hedy- osperma plantation was 85.58 t·hm^-2, among them the biomass of arbor layer was 82.05 t·hm^-2 , while the un- derstory layer was 3.53 t·hm^-2, which accounted for 95.88 % and 4. 12 % of the total biomass. The distribu- tion law of biomass in each layer was arbor layer 〉 litter layer 〉 herb layer 〉 shrub layer. In all the fitted regression equations, individual biomass regression model [ W = 0. 088 8 （DEH） 0. 949 ] had a highest correlation coeffi- cient R2 =0. 978 2. The average net productivity of Michelia hedyosperma plantation was 11.21 t·hm^-2·a^-1, the productivity of arbor layer and understory layer were 9.45 t·hm^-2·a^-1 and 1.76 t·hm^-2·a^-1 respectivily, which amounted for 84.26 % and 15.74 % respectivily of the total. The productivity distribution law of each layerin the order of arbor layer （9.45 t·hm^-2·a^-1） 〉 little layer （1.17 t·hm^-2·a^-1） 〉 herb layer （0.48 t·hm^-2·a^-1） 〉 shrub layer （0.12t·hm^-2·a^-1）.