赣南马尾松天然林不同生长阶段碳密度分布特征  

Distribution characteristics of carbon density of natural Pinus massoniana forest at different stand growing stages in southern Jiangxi Province,eastern China

作　　者：郭丽玲[1] 潘萍[1] 欧阳勋志[1] 宁金魁[1] 臧颢[1] 刘苑秋[1] 杨阳 桂亚可 

机构地区：[1]江西农业大学林学院,江西南昌330045

出　　处：《北京林业大学学报》2018年第1期37-45,共9页Journal of Beijing Forestry University

基　　金：国家自然科学基金项目(31360181);中国科学院战略性先导科技专题(XDA05050205)

摘　　要：【目的】通过对赣南马尾松天然林碳密度的分析,为其区域尺度上森林碳储量的准确估算以及开展碳汇林业的科学经营提供参考依据。【方法】基于标准地调查与碳含量的测定,采用单因素方差分析和LSD多重比较法,分析不同林龄、层次及不同组分碳密度的分布特征。【结果】(1)林分总碳密度为129.00 t/hm^2,表现为成熟林(185.41 t/hm^2)>近熟林(140.54 t/hm^2)>中龄林(114.21 t/hm^2)>幼龄林(75.83 t/hm^2);各层碳密度为土壤层(80.02 t/hm^2)>乔木层(43.81 t/hm^2)>林下植被层(4.60 t/hm^2)>凋落物层(0.57 t/hm^2),分别占总碳密度的62.03%、33.96%、3.57%和0.44%;每层碳密度的分配规律表现为:乔木层为树干>树枝>树根>树叶,林下植被为草本层>灌木层,凋落物为半分解层>未分解层,土壤各层单位厚度的碳密度随土层深度的增加而逐渐降低。(2)随林龄的增大,各层碳密度的变化规律不尽相同。其中,乔木层、土壤层的碳密度均呈增加趋势,且均以成熟林最大,成熟林的林木各组分碳密度均显著高于其他龄组(P<0.05),而土壤层碳密度在不同龄组间均存在显著差异(P<0.05);林下植被层碳密度随林龄变化表现出先减后增趋势,但以幼龄林最大。不同龄组间的灌木层、草本层及其各组分碳密度均有显著差异(P<0.05),其中灌木层碳密度以近熟林最大,草本层碳密度以成熟林最大;凋落物层碳密度随林龄增大表现为先增后减的趋势,近熟林未分解层碳密度显著高于其他龄组(P<0.05),而半分解层碳密度各龄组间差异不显著(P>0.05)。【结论】土壤层和乔木层是马尾松天然林整个生态系统碳密度的主体;随着林龄的增大,乔木层及其各组分和土壤层的碳密度均呈增加趋势,而林下植被层、凋落物层及其各组分碳密度的变化并未表现出相同规律。[ Objective] To analyze the carbon density of natural Pinus massoniana in southern Jiangxi Province of eastern China was to provide references for accurate estimation of forest carbon stocks in regional scale, and to develop scientific management of carbon sequestration forest. [ Method] Based on the investigation of standard plots and the determination of carbon content , the distribution characteristics of carbon density of different stand ages, layers and components were analyzed by one-way ANOVA and LSD multiple comparison methods. [ Result] （ 1 ） the total carbon density of stand was 129.00 t/ha. The carbon density of different age groups ranked as mature forest （ 185.41 t/ha） 〉 near-mature forest （ 140.54 t/ha） 〉 middle-aged forest （ 114.21 t/ha） 〉 young forest （75.83 t/ha）. The carbon density of different layers followed a sequence of soil layer （80.02 t/ha） 〉 arbor layer （43.81 t/ha） 〉 understory vegetation layer （4.60 t/ha） 〉 litter layer （0.57 t/ha）, accounted for 62.03%, 33.96%, 3.57% and 0.44% of total carbon density, respectively. The distribution law of carbon density in different layers performed as follows ： the arbor layer was trunk 〉 branch 〉 tree root 〉 tree leaf, the understory vegetation layer was herb layer 〉 shrub layer, the litter layer was half-decomposed layer 〉 undecomposed layer, the carbon density of unit thickness at each soil layer decreased with the increase of soil depth. （2） The variation law of carbon density in different layers differed with the increase of stand age. The carbon density of arbor and soil layer increased along forest development, and in mature forest was the largest. The carbon density of different components of arbor layer in mature forest was significantly higher than in other age groups （P 〈 0.05） , but there were significant differences in the carbon density of soil layer among different age groups （P 〈 0.05 ）. The carbon density of understory vegetation layer decreased firstly and t

关 键 词：马尾松 天然林 碳密度 分布特征 

分 类 号：S718.554.2[农业科学—林学] S791.248