樟子松种源含碳量遗传变异分析与高碳汇种源选择

以黑龙江省尚志市帽儿山实验林场28年生樟子松种源试验林为对象,测定了树高、胸径、材积、木材密度、含碳率、干材生物量、碳储量、木质素质量分数、综纤维素质量分数,并运用Spass18分析软件估算了各性状及指标的变异系数、相关系数,以筛选含碳率高、碳储量大的种源。结果表明,树高、胸径、材积、干材生物量、碳储量都存在较大的变异。其中:干材生物量变异系数最大,为26.818%;木材密度、含碳率、木质素质量分数、综纤维素质量分数的变异相对较小,含碳率变异系数最小,为1.479%;碳储量与胸径、树高、材积、木材密度、干材生物量、含碳率各项指标均正相关极显著,含碳率与木材密度和干材生物量正相关显著。对生长性状及各项指标进行方差分析表明:种源干材生物量存在显著差异;木质素质量分数存在显著差异;碳储量、木材密度、立木材积在10%水平上达到显著。通过对8个种源的生长性状及干材生物量、含碳率、碳储量的分析,选择出含碳率较高、碳储量较大的2个种源,即红花尔基和图强,其含碳率分别为0.469、0.472,单株碳储量分别为31.268、29.175 kg,2个种源的单株碳储量均值高于对照37.2%。

Genetic Variation of Carbon Density for Pinus sylvestris var. mongolica Provenances and Selection of Provenances of High Carbon Sequestration

Tree height,diameter at breast height(DBH),standing tree volume,wood basic density,carbon density,trunk biomass,carbon storage,lignin content,and cellulose content of 28-year-old Pinus sylvestris var.mongolica forests were determined in Maoershan Experimental Forest Farm of Shangzhi City,Heilongjiang Province.The provenances of high carbon density and storage were selected out by estimating the coefficient of variation and correlation coefficient of all the factors.Results show that there are significant variations in tree height,DBH,standing tree volume,trunk biomass,and carbon storage between and within provenance,and the coefficient of variation for trunk biomass is highest(26.818%).There is a slight variation in wood basic density,carbon density,lignin content,and cellulose content,and the coefficient of variation for carbon density is lowest(1.479%).Carbon storage is significantly positively correlated with DBH,tree height,volume,wood basic density,trunk biomass,and carbon density(P<0.01),and carbon density is significantly positively correlated with wood basic density and trunk biomass(P<0.05).Analysis of variance shows that there are significant differences in trunk biomass and lignin content between different provenances,and there are significant differences in carbon storage,wood basic density,and standing tree volume at the 10% level.Two provenances,Honghuaerji and Tuqiang,were selected out.The carbon density and storage of Honghuaerji and Tuqiang provenances were 0.469,31.268 kg and 0.472,29.175 kg,respectively.The carbon storages of a single tree from the two provenances were both 37.2% higher than that from the control.