四川洪雅退耕还林地麻竹生物量和碳储量

利用标准样方法结合数据分析法研究了洪雅县还林地麻竹的生物量、碳储量,研究结果表明:①麻竹(Dendrocalamus latiflorus Munro)平均株高为15.57 m,平均胸径为7.89 cm,单株生物量为8.59 kg,总生物量为27.91t/hm2,碳储量为13.79 t/hm2。②各形态因子之间、地上部分各变量之间、总生物量与地上部分各变量之间存在显著或极显著相关性,地下部分各变量与其他变量相关性均不显著(P<0.05)。③各组分与形态因子的拟合中,以杆和形态因子的拟合为最佳,其方程为Y=-5.885+1.446D-0.108H+0.212d;总生物量与形态因子的拟合中,最佳模型为Y=-4.48+1.623D-0.245H+0.47d。④麻竹各器官碳含量介于0.454 2~0.530 6 g/g之间,平均碳含量为0.486 2 g/g,各器官含碳量从高到低依次为:杆>蔸>根>枝>叶。

Biomass and Carbon Stock of Dendrocalamus latiflorus Munro Established on the Land Converted from Farmland at Hongya County, Sichuan Province

This study was made on biomass and carbon storage of Dendrocalamus latiflorus Munro established in the sloping land conversion program in the rainy zone of western China.The results indicated that: ①The average tree height,diameter at breast height(DBH),average biomass of individual plant,total biomass and carbon stock of Dendrocalamus latiflorus Munro were 15.57 m,7.89 cm,8.59 kg,27.91 t/hm2 and 3.79 t/hm2,respectively;②Significant correlations existed among different shape factors(including tree height,DBH and ground diameter),different variables in the aboveground,and between total biomass and the variables in the aboveground(P<0.05) but correlation between underground parts and other variables was insignificant;③Linear model of Y=-5.885+1.446D-0.108H+0.212d showed a good fit for stem and different variables.The best model for total biomass and different shape factors was Y=-4.48+1.623D-0.245H+0.47d;④The carbon content of different organs of Dendrocalamus latiflorus Munro ranged from 0.454 2 g/g to 0.530 6 g/g and the average carbon content was 0.486 2 g/g.The carbon content in Dendrocalamus latiflorus Munro organs showed this order: culm > underground trunk > root > branch > leaf.