摘要
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 accounted for 25％ and 20％ of the total volume and the total forest area of national forests in China,respectively,and played an important role in regional carbon budgets.Based on the document data about the biomass of five dominant subtropical forests （20°13′～ 30°72′N,103°36′～ 122°45′E）：Chinese fir forest （Cunninghamia lanceolata forest,CL）,Mason pine forest （Pinus massioniana forest,PM）,evergreen broadleaved forest （EBF）,broad-leaved growing-fast plantation （BP）,and coniferous and broad-leaved mixed forest （CBM） in subtropical region of China,the correlations of eight carbon pools including stem,branch,leaf,aboveground,underground,total carbon pool of arbor layer,understory vegetation （including shrub layer and herbaceous layer）,and dead biomass （including snags,dead fallen tress,dead branches,and litter） were analyzed with the correlation matrix method.The regression equations were used to study the relationships among the volume and the carbon densities of the arbor layer,understory vegetation,and the dead biomass.Maximum carbon densities in the arbor layers of five forest types were studied by Logistic curves.The results showed that：（1） There were significant differences in the carbon densities and their allometric patterns of the carbon components among five subtropical forest ecosystems,but the carbon densities and allometric ratio showed same orders in five subtropical forests：Arbor layer＞dead biomass＞understory vegetation layer.（2） Significant correlations were found among the carbon pools of stem,aboveground,underground,total carbon densities of arbor layer （p＜0.001）,and they significantly correlated with the carbon pools of dead biomass （p＜0.05）.Carbon density of the understory vegetation was significantly correlated with stem,above ground,underground of arbor layer,and dead biomass in four forest types except CBM （p ＜0.05）.（3） Regression curves arrived significant level （p ＜ 0.05） among volumes and the carbon pools of the understory vegetation,arbor layer,dead biomass in CL,PM,EBF,BP forests （p＜0.05） except that in CBM （p＞0.05）.（4） Carbon densities in the arbor layers and forest ages of five subtropical forests were significantly fitted Logistic curves （p＜0.0001）.Maximum values of carbon densities in the arbor layers were 194.43 Mg/hm2,110.62 Mg/hm2,260.42 Mg/hm2,175.52 Mg/hm2 and 157.20 Mg/hm2,respectively in five subtropical forests and these data could be considered as the reference levels for the carbon sequestration potential in the arbor layers by five subtropical forests in China.
出处
《第四纪研究》
CAS
CSCD
北大核心
2014年第4期777-787,共11页
Quaternary Sciences
基金
中国科学院战略性先导科技专项项目-应对气候变化的碳收支认证及相关问题(批准号:XDA05050702)资助
