西双版纳几种人工幼林的生物量研究

Study of Biomass of Six Kinds of Plantations in Xishuangbanna

经对西双版纳几种 7年生人工幼林的生物量研究结果表明 :人工林的乔木层生物量以马尖相思纯林最大 ,为 92 4 9t/hm2 ,干材生物量以高阿丁枫纯林最大 ,达到 5 6 0 6 8t/hm2 ;混交林以西南桦和高阿丁枫混交的最大 ;各类型人工林的干材生物量均大于 10年生的热带次生林 ;灌木层生物量最大的是西南桦 +山桂花 ,为 16 5 1t/hm2 ,远高于其他类型 ,为最小的高阿丁枫纯林的 11倍。天然的山地雨林和季风常绿阔叶林的灌木层生物量远大于人工林。草本层生物量中西南桦 +高阿丁枫混交林的最大 ,达 6 9t/hm2 ;草本层生物量在总生物量中所占比例较小 ,平均为 1 6 9%。马尖相思纯林的枯落物量最大 ,为 14 2 6t/hm2 。

The biomass of six kinds of seven years old plantations in Xishuangbanna, including four kinds of pure forests of Paramichelia baillonii, Betula alnoides, Acacia mangium and Altingia excelsa, and two kinds of mixed forests, were examined and studied. The results indicated as the follows: The biomass of tree layer of Acacia mangium plantation of 92 49 t/hm 2 was the highest among those studies stands. The highest stemwood biomass of pure forests and mixed forests were Altingia excelsa plantation and mixed forest of Betula alnoides and Altingia excelsa, achieved 56 06 t/hm 2 and 59 03 t/hm 2 respectively. All the six studied plantations showed higher stemwood biomass than tropical secondary forests of 10 years old. For the shrub layer, the highest biomass among the six kinds of studied plantations was 16 51 t/hm 2 of the mixed forests of Betula alnoides and Paramichelia baillonii, which was eleven times of the lowest plantation, Altingia excelsa. The shrub layer biomass of natural mountainous rain forests and monsoon evergreen borad leaved forests were significantly higher than plantation The festratum biomass of mixed forest of Betula alnoides and Altingia excelsa was highest, achieved 6 9 t/hm 2. The biomass of festratum accounted for only a limited proportion of total biomass, averagely 1 69 %. The litter biomass of Acacia mangium plantation was the highest, achieved 14 26 t/hm 2.