【摘要】 比较研究了湖南会同4种退耕还林模式植被恢复初期幼林的生物量积累、产量分配特征及生产力的差异。结果表明:(1)主要造林树种的单株生物量均以地上部分占绝对的优势,占全株生物量的66%以上,各器官生物量的大小排序基本上为:树干>树根>树叶>树枝>树皮,造林树种的单株生物量存在一定的差异。(2)杜英×樟树混交林分生物量最高,为3.916 t.hm-2;樟树纯林的生物量最低,为1.213 t.hm-2。(3)4种退耕还林模式幼林各组分生物量相对分配百分率的大小均表现为:树干(带皮)占林木生物量的比例最大,为32.64%以上;树枝生物量所占的比例最小,仅在12.65%～17.98%之间。(4)杜英×樟树混交林的平均净生产力最高,为0.468 0 t.hm-2a-1,樟树林为其次,杜英×乐昌含笑混交林最低,仅为0.075 4 t.hm-2a-1,最高与最低相差0.392 6 t.hm-2a-1。更多还原

【Abstract】 The differances of biomass accumulation,production distribution characteristics and productivity among young plantations at early stage of vegetation restore with four models for conversion of farmland to forestland in Huitong,Hunan Province were compared and studied.The results show that the biomass of per tree aboveground was absolute superiority of the main tree species,accounting for 66 % of total plant biomass,and the biomass of organs was essentially of the order as: trunk>root> leaf>branch>bark,there were some differences in biomass of per tree.The sub-biomass of Elaeocarpus×camphor mixed forest was the highest,3.916 t·hm-2,the biomass of camphor forest was the lowest,1.213 t·hm-2.Under four kinds of model for conversion of farmland to forestland,the relative distribution of percentage of each component biomass of young plantation was as follows: trunk(skin) accounted for the largest proportion of forest biomass,for more than 32.64 %,the proportion of branch biomass was the smallest,only between 12.65 %～17.98 %,the average net productivity of Elaeocarpus×camphor mixed forest was the highest,0.468 0 t·hm-2a-1,camphor forest was followed,Elaeocarpus×chapensis mixed forest was the lowest,only 0.075 4 t·hm-2a-1,the difference between the highest and the lowest was 0.392 6 t·hm-2a-1.更多还原