长白落叶松高固碳种源选择研究

High Carbon Content Larch( Larix olgensis) Provenances Selection

以东北林业大学帽儿山试验林场31年生长白落叶松种源试验林为研究对象。首先对林木碳储量研究中非破坏性取样方法进行探究,通过对比树干1.3 m处木芯样品含碳率与树干平均含碳率数据,发现二者存在较强的线性关系,利用回归分析计算出直线方程y=0.908 2x+4.379 4,R2=0.842 5,方程拟合程度达到理想水平,利用1.3 m处木芯样品含碳率推算树干平均含碳率方法可行。对不同种源长白落叶松的生长、材性、含碳率、干材生物量、碳储量等性状进行测定,结合方差分析、多重比较、相关分析等数理统计方法,最终筛选出生长优良,固碳能力强的种源。结果显示:干材生物量与碳储量存在较丰富的变异,平均变异系数分别为21.33%和21.30%。相关分析结果显示,碳储量与生长性状、干材生物量呈极显著正相关,与综纤维素含量和木质素含量相关不显著。通过方差分析与Duncan法多重比较,最终选择出小北湖与白刀山两个种源为高固碳能力种源。小北湖与白刀山种源单株干材碳储量分别为74.38 kg和69.27 kg,二者平均值高出总平均值27.83%,比对照CK高出54.45%。以现有试验林为标准,若选择小北湖种源,则每公顷固碳27 297.46 kg,比利用碳储量最小的露水河种源造林每公顷固碳量高47.85%。

Taking 31-year-old larch （Larix olgensis） provenance test plantation as object, the non-destructive sampiing method was used to compare the carbon content of wooden core sample at the height of 1.3 m and the average carbon content of the whole trunk. It was found that there was an obvious linear relationship between them. By regression analysis, a linear equation, y = 0. 908 2x ＋ 4. 379 4, R2 is 0. 842 5, was derived. The fitting degree of the equation reached the desired level. The result showed that the average rate of carbon content in trunk could be calculated by using the carbon content of wood core sample at the height of 1.3 m. The analysis methods used in this study include variance analysis, multiple comparisons and correlation analysis. The superior provenances of high carbon content were selected and the variations in growth traits, timber characters, biomass of trunk and carbon content were analyzed. The results showed that variation in biomass and carbon content of the wood were significant, the coefficients of variations for both were 21.33% and 21.30%. The results of correlation analysis showed that the carbon content was significantly and positively correlated with the growth traits and biomass. According to these resuits, the authors analyzed the data by the theory of variance analysis and Duncan method. Two provenances, XBH and BDS, were chosen as the best provenances. The mean carbon content values of XBH and BDS were 74.38 kg and 69.27 kg respectively, and the mean value of these two provenances was higher than the overall mean value by 27.83%. The carbon content of XBH was higher than that of the CK and the provenance LSH （with the least carbon content） by 60.00% and 47.8%, and higher than the mean value of all the provenances by 28.3%.