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中国亚热带森林对亚热带地区乃至中国的碳收支和碳平衡具有十分的重要作用。根据中国亚热带地区5种主要林型(杉木林、马尾松林、常绿阔叶林、阔叶速生人工林和针阔混交林)生物量的文献资料,采用关联矩阵法分析了亚热带5种林型树干、树枝、树叶、乔木层地上部分、乔木层地下部分、乔木层总碳库、林下植被碳库(包括灌木层和草本层)、死生物量碳库(包括枯立木、枯倒木、枯枝和凋落物)8个碳库间的偶联关系,利用回归方程研究乔木层、林下植被层、死生物量碳密度与立木蓄积量的关系,通过Logistic曲线探讨5种林型乔木层的最大碳密度。结果表明:1)5种林型生态系统碳库组分的碳密度和分配比例存在明显差异,但均呈现乔木层>死生物量>灌木层>草本层的规律;2)5种林型树干、乔木层地上部分、乔木层地下部分、乔木层总碳库的碳密度之间关联性极为显著(p<0.001),它们与死生物量碳密度的关联性均达到显著水平(p<0.05);针阔混交林的林下植被碳密度与其他碳库组分碳密度相关性不显著(p>0.05),而其他4种林型的林下植被碳密度均与树干、乔木层地上部分、乔木层地下部分、乔木层总碳库、死生物量的碳密度显著相关(p<0.05);3)针阔混交林的林下植被碳密度与立木蓄积量相关性不显著,其他4种林型的乔木层总碳密度、林下植被碳密度、死生物量碳密度与立木蓄积量的回归曲线均达到显著水平(p<0.05);4)5种林型乔木层的碳密度与林龄的关系符合Logistic曲线(p<0.0001),碳密度最大值分别为194.43Mg/hm~2,110.62Mg/hm~2,260.42Mg/hm~2,175.52Mg/hm~2和157.20Mg/hm~2,它们可视为亚热带5种林型乔木层固碳潜力的参考水平。
Subtropical forests in China play a very important role in carbon budget and carbon balance in the subtropics and even in China. Based on the literature data of the biomass of five main forest types (Chinese fir, Pinus massoniana, evergreen broad-leaved, broadleaved fast-growing plantations and coniferous and broad-leaved mixed forests) in the subtropical regions of China, the correlation matrix method Tree trunks, branches, leaves, arbor layer, arbor layer, arbor layer total carbon pool, understory vegetation carbon pool (including shrub layer and herb layer), dead biomass carbon pool (including dead trees, Branches and litter). The relationship between carbon layer density, biomass density and stand volume was studied by using regression equation. Logistic curves were used to investigate the relationship between five tree types Maximum carbon density. The results showed as follows: 1) There were significant differences in carbon density and distribution ratio among five forest ecosystem carbonates, but all showed the law of arbor layer> dead biomass> shrub layer> herb layer; 2) (P <0.001), and their correlation with the carbon density of dead biomass reached significant level (p <0.05). The correlation between the carbon density and the carbon density in the arbor layer was significant (P> 0.05). However, the carbon density of undergrowth vegetation in the other four forest types was not related to the carbon density of trunk and tree layer, There was a significant correlation between the carbon density of total carbon stocks and dead biomass in the arbor layer (p <0.05); 3) There was no significant correlation between the carbon density of understory vegetation and stand volume in the coniferous-broadleaved mixed forest, (P <0.05) .4) The carbon density and age of the five tree species layers (P <0.05) were significantly higher than those of the control (P <0.0001), the maximum carbon density was 194.43Mg / hm ~ 2, 110.62Mg / hm ~ 2 , 260.42Mg / hm ~ 2,175.52Mg / hm ~ 2 and 157.20Mg / hm ~ 2, respectively, which can be regarded as the reference level for carbon sequestration potential of five tree species in subtropical zone.