亚热带日本落叶松人工林生态系统的碳素含量研究

基于35块样地调查数据,对亚热带日本落叶松人工林生态系统的碳素含量进行了分析。结果表明:(1)日本落叶松人工林生态系统碳素含量包括植被、凋落物与土壤三部分,其中乔木层601.896 1±29.562 4g/kg,灌木层537.958 0±34.783 9 g/kg,草本层416.107 5 g/kg,凋落物层550.927 8±30.566 4 g/kg,土壤层30.477 1±1.848 0 g/kg,表现规律为:乔木层凋落层灌木层草本层,地上部分地下部分,且乔木层、凋落物层和土壤层的碳素含量随着林分年龄和坡向的不同而变化。(2)日本落叶松植被层的碳素含量平均值为0.518 7 g/g,略高于国际上通用的转换率0.50 g/g,如果采用0.50 g/g来估算日本落叶松植被层的碳贮量与碳密度,会使得估算结果偏小。(3)日本落叶松乔木层不同器官碳素含量变化范围为561.499 3~645.106 8 g/kg,其高低顺序大致排列为:树干树枝树皮树根树叶,且随着林分年龄和坡向的不同而变化。

Carbon contents of Larix kaempferi plantation ecosystem in subtropics

The carbon contents of Larix kaempferi plantation ecosystem in subtropics on the base of investigation data of 35 plots were analyzed. The results indicated：（ 1） The carbon content of Larix kaempferi plantation ecosystem contained three parts： vegetation layer,litter layer and soil layer,which with 601. 896 1 ± 29. 562 4 g / kg in arbor layer,537. 958 0 ± 34. 783 9 g / kg in shrub layer,416. 107 5 g / kg in herb layer,550. 927 8 ± 30. 566 4 g / kg in litter layer and 30. 477 1 ± 1. 848 0 g / kg in soil layer. Change trend of carbon content in all layers was arbor layer ＆gt; litter layer ＆gt; shrub layer ＆gt; herb layer,and aboveground part ＆gt; underground part. In addition,carbon contents of arbor layer,litter layer and soil layer changed with stand age and slope.（ 2） Average carbon content of vegetation layer was 0. 518 7 g / g,which was little higher than the current international conversion coefficient of 0. 5. So,using coefficient of 0. 5 may underestimate carbon storage and carbon density of Larix kaempferi.（ 3） Different organs’ carbon contents of Larix kaempferi arbor layer varied from 561. 499 3 g / kg to 645. 106 8 g / kg. Its order was trunk ＆gt; branch ＆gt; bark ＆gt; root ＆gt; leaf,and varied with stand age and slope.