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广西不同林龄硬阔林生态系统碳储量及其分配格局

王华1,2,苏樑1,2,3*,宋同清2,3,曾馥平2,3,彭晚霞2,3,杜虎2,3,陈莉1,2,3,张芳2,3#br#   

  1. (1湖南农业大学生物科学技术学院, 长沙 410128; 2中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室, 长沙 410125; 3中国科学院环江喀斯特生态系统观测研究站, 广西环江 547100)
  • 出版日期:2017-06-10 发布日期:2017-06-10

Carbon storage and allocation in hardwood broad-leaved forests with different stand ages in Guangxi.

WANG Hua1,2, SU Liang1,2,3*, SONG Tong-qing2,3, ZENG Fu-ping2,3, PENG Wan-xia2,3, DU Hu2,3, CHEN Li1,2,3, ZHANG Fang2,3#br#   

  1. (1College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China; 2Key Laboratory of Agroecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; 3Huanjiang Observation and Research Station of Karst Ecosystem, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China).
  • Online:2017-06-10 Published:2017-06-10

摘要: 在生物量调查的基础上,对广西硬阔林幼龄林、中龄林、近熟林、成熟林和过熟林5个不同林龄阶段碳储量及其分配特征进行了研究。结果表明:硬阔林生态系统总碳储量表现为过熟林(514.44 t·hm-2)>成熟林(439.92 t·hm-2)>幼龄林(325.29 t·hm-2)>中龄林(315.27 t·hm-2)>近熟林(214.64 t·hm-2),不同林龄碳储量分布格局均为土壤层>植被层>凋落物层,地下部分>地上部分;其中植被层为79.12~179.17 t·hm-2,占总碳储量的23.09%~43.84%,随林龄的增长不断增加。凋落物层为0.91~2.32 t·hm-2,占总碳储量的0.21%~0.76%,随林龄的增长呈“W”型变化趋势。土壤层为120.55~335.27 t·hm-2,占总碳储量的56.16%~76.91%,随林龄的增长呈先降后升的变化趋势。植被层碳储量以乔木层最大(72.35~173.07 t·hm-2),占植被层碳储量的28.92%~76.58%,随林龄的增长而增加,其中乔木层碳储量以树干为最大,为44.99~110.87 t·hm-2,占植被层碳储量的17.98%~47.77%,随林龄的增长而增加;根、枝、叶所占比例分别为4.46%~11.82%、4.52%~11.90%、1.95%~5.09%,随林龄的增长而增加。

Abstract: Based on the data of biomass at five different stand ages, i.e., young forest, middleaged forest, pre-mature forest, mature forest and overmature forest, the carbon storage and distribution patterns of hardwood broadleaved forests at different ages in Guangxi were studied. The results showed that the total carbon storage of the hardwood broadleaved forest ecosystems presented in the order of overmature forest (514.44 t·hm-2), mature forest (439.92 t·hm-2), young forest (325.29 t·hm-2), middleaged forest (315.27 t·hm-2), and premature forest (214.64 t·hm-2). The carbon storage distribution of different stand ages was in the order of soil layer > vegetation layer > litterfall layer, and belowground part > aboveground part. The carbon storage of the vegetation layer ranged from 79.12 to 179.17 t·hm-2, which accounted for 23.09%-43.84% of the total carbon storage and increased with stand age. The carbon storage of litterfall ranged from 0.91 to 2.32 t·hm-2, which accounted for 0.21%-0.76% of the total carbon storage and showed a “W” type variation with the increasing age. The carbon storage of soil layer ranged from 120.55 to 335.27 t·hm-2, which decreased firstly and then increased with the increasing age and accounted for 56.16%-76.91% of the total carbon storage. The maximum carbon storage of vegetation layer was tree layer (ranging from 72.35 to 173.07 t·hm-2), which accounted for 28.92%-76.58% of the tree layer carbon storage and increased with stand age. The maximum carbon storage of the tree layer was trunk (ranging from 44.99 to 110.87 t·hm-2), which accounted for 17.98%-47.77% of the carbon storage of tree layer and increased with stand age. The proportion of root, branch and leaf accounted for 4.46%-11.82%, 4.52%-11.90%, and 1.95%-5.09% respectively, and increased with stand age.