海南岛尖峰岭鸡毛松人工林乔木层生物量和生产力研究

对海南岛尖峰岭35年生鸡毛松人工林生物量的结构与分布特点、净初级生产力和林分生长的动态变化进行了研究。结果表明,鸡毛松人工林乔木层生物量达285 53t·hm-2,其中树干为190 82t·hm-2,树皮为19 19t·hm-2,树枝为35 93t·hm-2,树叶为7 96t·hm-2,根为31 63t·hm-2,鸡毛松不同器官生物量的比例为树干∶树枝∶根∶树皮∶树叶=24 0∶4 5∶4 0∶2 4∶1 0。12～22cm径级的立木生物量占总生物量的70 9%,而8m以下的树干生物量占其总生物量的80%以上。1～25a内生物量增长迅速,年平均净生产量随年龄的增加而增大,25a后生物量增长相对较慢,进入生长的平稳期。35a鸡毛松人工林乔木层年平均净生产力可达10 34t·hm-2·a-1,最大可达13 99t·hm-2·a-1,表现出较高的生产力。

Study on Biomass and Net Primary Productivity of Podocarpus imbricatus Plantation in Jianfengling,Hainan Island

The Biomass,net primary productivity and dynamic changes of forest were determined and investigated on a thirty-five years old Podocarpus imbricatus plantation in Jianfengling,Hainan Island. The total biomass of tree layer of the plantation was 285.53 t·hm^-2,of which the stem accounted for 190.82 t·hm^-2,branches 35.93 t·hm^-2,leaf material 7.96 t·hm^-2 and roots 31.63 t·hm^-2.Regarding the production structure,the biomass of trunk under the heights of 8 meters accounted for 80% of the total and which of the stumpage with the diameter class between 12 cm and 22 cm accounted for 70% of the total.The biomass of the plantation increased rapidly between 1 and 25 years and annual average net primary productivity increased with the age of the trees,but the growth slowed down after 25 years.It was a high productivity plantation with a net primary productivity averaged at 10.34 t·hm^-2·a^-1 and the highest one could reach as high as 13.99 t·hm^-2·a^-1.The integrate effects could be improved by regulating the present structure of the community.