厚荚相思人工林碳素贮量及其空间分布  

Carbon storage and distribution in Acacia crassicarpa plantation ecosystem

作　　者：何斌[1] 余春和 王安武 李就鹏 陈玉萍[1] 荣薏[1] 

机构地区：[1]广西大学林学院,广西南宁530004 [2]广西七坡林场,广西南宁530225

出　　处：《南京林业大学学报（自然科学版）》2009年第3期46-50,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：广西科学基金资助项目(桂科自0640018);广西教育厅科研基金(2006-26);广西“十五“林业科学研究项目(2002-66)

摘　　要：对7年生厚英相思人工林生态系统的碳素含量、贮量及其空间分布特征进行了研究。结果表明：厚荚相思不同器官碳素含量为470．1～533．8g／kg，排序从大到小依次为树叶、树枝、树干、树根、树皮。灌木层、草本层和凋落物层碳素含量分别为465．4、425．7和478．3g／kg。土壤（0～80cm）平均碳素含量为12．94g／kg，随土层深度的增加，各层次土壤碳素含量逐渐减少。厚英相思人工林生态系统总碳贮量为141．05t／hm^2，其中乔木层为46．97t／hm^2，占整个生态系统碳贮量的33．30％；灌草层为2．07t／hm^2，占1．47％；凋落物层为4．49t／hm^2，占3．18％：林地土壤（0～80cm）为92．01t／hm^2，占65．23％。厚荚相思各器官碳贮量与其生物量成正比例关系，树干的碳贮量最高，占乔术层碳贮量的52．20％，树枝、树叶、树皮和树根等碳贮量共占乔木层的47．80％。7年生厚荚相思人工林乔木层年净生产力为20．06t／（hm^2·a），碳素年净固定量为9．86t／（hm^2·a）。The content, storage and distribution of carbon in 7-year-old Acacia crassicarpa plantation ecosystem were studied. The results showed that carbon content in different organs of A. crassicarpa trees ranged from 470. 1 g/kg to 533.8 g/kg, and decreased in the order of leaf 〉 branch 〉 stem 〉 root 〉 bark. The carbon content in shrub, herb and litter floor were 465.4 g/kg, 425.7 g/kg and 478.3 g/kg, respectively. Carbon content in the soil （0-80 cm） was 12.94 g/kg and declines with soil depth. The total carbon storage in A. crassicarpa plantation ecosystems amounted to 141.05 t/hm^2 , of which over-storey of A. crassicarpa stored 46.97 t/hm^2 and accounted for 33.30% , and under-storey plant stored 2.07 t/hm^2 and accounted for 1.47% , and litter floor stored 4.49 t/hm^2 and accounted for 3.18% , and soil stored 92.01 t/hm^2 and accounted for 65.23%. The carbon storage in different organs was positively related to the biomass of corresponding organs. Stem accumulated the highest carbon storage, comprised 52.20% of carbon storage in overstory trees, the rest in branch, leaf, bark and root, etc. , seized 47.80%. The annual net productivity ofT-year-old A. crassicarpa plantation was 20.06 t/（ hm^2· a） and annual carbon fixation was up to 9.86 t/（ hm^2·a）.

关 键 词：厚荚相思人工林 碳素含量 碳贮量 碳分配 

分 类 号：S718.55[农业科学—林学]