不同密度杉木人工林各组分碳贮量分析

Analysis of Carbon Storage of Different Components in Different Density of Chinese Fir Plantation

2019年5月,以福建农林大学莘口教学林场3种密度(1800、3000、4500株·hm^-2)的12年生杉木人工林为研究对象,研究其地上部分树干、树枝、树皮、宿留枯死枝、林下植被、凋落物及地下部分根等各组分碳储量及其分配。结果表明,杉木人工林树干、树皮、宿留枯死枝、不同径级根、凋落物碳储量及分配率总体随密度增大而呈逐渐上升趋势,而林下植被碳储量及分配率总体随密度增大而呈逐渐下降趋势。密度1800株·hm^-2杉木人工林各组分碳储量表现为乔木层>根系>林下植被层>凋落物层,而密度3000、4500株·hm^-2杉木人工林各组分碳储量表现为乔木层>根系>凋落物层>林下植被层。相关性分析结果表明,林分密度与树干、树根、宿留枯枝、宿留枯叶、凋落物碳储量呈极显著正相关,而与鲜叶碳储量呈显著负相关。研究结果可为定量评价杉木人工林的碳汇能力及提高杉木人工林碳吸存能力提供参考。

Three kinds of density(1800 plants·hm^-2,3000 plants·hm^-2,4500 plants·hm^-2)Chinese fir plantation were taken as the research object,the carbon storage and distribution of the above-ground part of its trunk,branches,bark,resident dead branches.understory vegetation,litters and underground roots were studied in this paper.The results showed that:with the increase of the density,the ecosystem of Chinese fir plantation of the tree trunk,bark,resident dead branches,roots of different diameters,litter carbon storage and distribution rates appear a gradual upward trend,while the understory vegetation of carbon storage and distribution rates appear a gradual downward trend.The carbon storage of components in the 1800 plants·hm-2 Chinese fir plantation show the trend of tree layer>root system>understory vegetation layer>litter layer,while the density 3000 plants·hm^-2 and 4500 plants·hm-2 show the trend of tree layer>root system>litter layer>understory vegetation layer.Correlation analysis results show that the forest density had a highly significant positive correlation with the carbon storage of trunks,roots,persistent dry branches,resident dead leaves,and litter carbon storage,but had a significant negative correlation with the carbon storage of fresh leaves.The research results provide a theoretical basis for quantitatively evaluating the carbon sink capacity of Chinese fir plantation and improving the carbon storage capacity of Chinese fir plantation.