韶关市小坑林场山杜英幼林植被层生物量和碳储量的分配格局

Allocation Patterns of Biomass and Carbon Storage of Vegetation Layer of A Young Elaeocarpus sylvestris Stand in Xiaoken Forest Farm, Shaoguan City

森林碳储量是森林生态系统碳库的重要组成成分,在全球碳循环中发挥着重要的作用。以韶关小坑林场山杜英(Elaeocarpus sylvestris)林为研究对象,研究其植被层和凋落物层的生物量、碳储量分配格局,为山杜英人工林的固碳能力和碳汇功能研究提供参考。在林地内建立3个20 m×20 m的样地,采用径阶标准木法,选取10株标准木,按照枝、叶、干和根分别进行取样。每个样地分别设置5个灌木样方(2 m×2 m)、草本样方(1 m×1 m)和凋落物样方(1 m×1 m)样方,收获样方内全部的灌木和草本及凋落物,并各取300 g样品,带回实验室分析。结果表明,山杜英林生物量为34.89 t·hm^(-2),平均碳质量分数为463.79 g·kg^(-1),碳储量为16.65 t·hm^(-2);山杜英林垂直结构的各组分中,乔木层的生物量(26.76 t·hm^(-2))和碳储量(12.85 t·hm^(-2))最大,占比分别为76.70%和77.18%;乔木层各组分中,树干的生物量(13.60 t·hm^(-2))和碳储量(6.62t·hm^(-2))最大,占比分别为50.82%和51.52%。山杜英林树干碳储量是乔木层碳储量的主体,因此应充分利用其生长特性,最大限度地增加树干碳储量,从而增加林分植被层碳储量。该林分具有较大的碳汇潜力,可通过提高林分密度以提高林分的碳储量。

Forest carbon storage is an important component of the carbon pool in forest ecosystems,which plays an important role in global carbon cycle.Taking an E.sylvestris stand as the research object,its allocation patterns of biomass and carbon storage were studied to provide a basis for carbon sequestration and carbon sink function research in E.sylvestris stands.Three plots with an area of 20 m×20 m were established in the stand,and then ten standard woods were selected using standard sampling method,and finally the samples of leaves,branches,stem and roots of tree layers were collected.Five shrub plots(2 m×2 m),herb plots(1 m×1 m)and litter plots(1 m×1 m)were set in each plot,respectively,and all shrubs,herbs and litter were collected,and finally a 300 g sample of each component was taken and brought back to the laboratory for analysis.The results showed that total biomass,average carbon content and the total carbon storage were 34.89 t·hm^-2,463.79 g·kg^-1,and 16.65 t·hm^-2,respectively,among which,the biomass and the carbon storage of the tree layer were the largest with the values of 26.76 t·hm^-2 and 12.85 t·hm^-2,accounting for 76.70%and 77.18%of the total,respectively.Among the vertical structural components,the biomass and the carbon storage of the stem were the largest with the values of 13.60 t·hm^-2 and 6.62 t·hm^-2,accounting for 50.82%and 51.52%of the total,respectively.The stem of E.sylvestris was the main body of carbon storage in the tree layer,and therefore it was necessary to make full use of its growth characteristics to maximize the carbon storage of the stem for increasing the carbon storage of the forest vegetation layer.The young E.sylvestris stand has a large potential for carbon sink,and its carbon storage can be increased by increasing stand density.