林分密度对水曲柳人工幼龄林植被碳储量的影响

Carbon Storage in Vegetation in Fraxinus mandshurica Young Plantations of Different Densities

在帽儿山实验林场采用样地调查的方法,对13年生4种密度的水曲柳人工林进行了植被碳储量研究。结果表明,随林分密度的增加,乔木层碳储量逐渐增大,而林下植被层碳储量逐渐降低,且林木单株碳储量随密度增大而减小。不同密度林分中,乔木层碳储量占植被总碳储量的98.5%～99.5%。4种密度林分总的植被碳储量分别为:19.95、26.27、27.45和30.05 t.hm-2,随林分密度的增加而增大。这说明在所研究的水曲柳人工林中,林分密度对植被碳储量具有明显的影响。

A study was performed to estimate the biomass and carbon storage in vegetation in 13-year-old Fraxinus mandshurica plantations of different densities at Maoershan Experimental Forest Farm by sample-plot method.Results showed that,with increasing stand density,the carbon storage of tree layer gradually increased,while the carbon storage of vegetation layer under canopy gradually reduced,and the carbon storage in a single tree decreased.The carbon storages of tree layer in F.mandshurica plantations of different densities accounted for the vast majority of the total vegetation carbon storage,ranging from 98.5% to 99.5%.The carbon storages in vegetation in F.mandshurica plantations of four densities（2200,2500,4400,10000 individuals per hectare） were 19.95,26.27,27.45 and 30.05t·hm-2,respectively,which increased with increasing stand density.It shows that stand density has an obvious impact on the carbon storage in vegetation in F.mandshurica plantations.