桃江毛竹林生物量分布特征

Biomass Distribution Characteristics of Phyllostachys pubescens Plantations in Taojiang County

以湖南桃江县不同年龄毛竹人工林为研究对象,探讨不同年龄毛竹林分生物量分布特征。结果表明,1年生、3年生和5年生不同年龄毛竹林分生物量分别为20.254、25.036t·hm^(-2)和55.685t·hm^(-2);毛竹林各组分生物量的大小顺序均表现为竿>枝>叶>竹蔸>竹鞭>侧根>须根,除竹鞭外,其他各组分生物量均表现出随年龄增长而增长的趋势;毛竹林地上部分生物量分别为17.787、22.159t·hm^(-2)与46.544t·hm^(-2),占林分总生物量的百分比分别为87.82%、88.51%与83.58%,属丰产林类型;地下部分生物量分别为2.467、2.877t·hm^(-2)与9.141t·hm^(-2),占林分总生物量百分比的12.18%、11.49%与16.42%。林下植被层生物量分别为6.522、4.325t·hm^(-2)与0.347t·hm^(-2),死地被物层分别为1.371、1.588t·hm^(-2)与1.731t·hm^(-2)。

In the present study,the biomass production and carbon storage of bamboo plantations with three ages （1-,3-,and 5-year-old） were investigated in Taojiang County,Hunan Province,China.The results showed that the values of the biomass for three age plantations were 20.254,25.036 and 55.685 t·hm-2 in the overstory （bamboo） layer.The biomass of different organs was in the order of pole〉branch〉leaf〉culm stump〉rhizome〉lateral root〉fibrous roots.Except for rhizome,the biomass of other organs increased with age.The values of the biomass of aboveground part for three age plantations were 17.787,22.159,and 46.544 t·hm-2,respectively,accounting for 87.82%,88.51%,and 83.58% of the total.For underground layer,they were 2.467,2.877,and 9.141 t·hm-2,accounting for 12.18%,11.49%,and 16.42% of the total,6.522,4.325,and 0.347 t·hm-2 for vegetation layer,and 1.371,1.588,1.731 t·hm-2 for litter layer.