植物生态学报 ›› 2017, Vol. 41 ›› Issue (1): 62-70.DOI: 10.17521/cjpe.2016.0038

所属专题: 中国灌丛生态系统碳储量的研究 青藏高原植物生态学:群落生态学

• 研究论文 • 上一篇    下一篇

青海高寒金露梅灌丛碳密度及其分配格局

杨路存1,2, 李长斌1,3, 宁祎1,3, 聂秀青1,3, 徐文华1,2, 周国英1,2,*()   

  1. 1中国科学院西北高原生物研究所, 西宁 810008
    2中国科学院藏药研究重点实验室, 西宁 810008
    3中国科学院大学, 北京 100049
  • 收稿日期:2016-01-11 接受日期:2016-11-11 出版日期:2017-01-10 发布日期:2017-01-23
  • 通讯作者: 周国英
  • 作者简介:* 通信作者Author for correspondence (E-mail:sunzhiqiang1956@sina.com)
  • 基金资助:
    中国科学院战略性先导科技专项(XDA- 0505030304)、科技基础性工作专项(2015FY1103- 0001)和国家科技支撑计划项目(2014BAC05B01)

Carbon density and its spatial distribution in the Potentilla fruticosa dominated alpine shrub in Qinghai, China

Lu-Cun YANG1,2, Chang-Bin LI1,3, Yi NING1,3, Xiu-Qing NIE1,3, Wen-Hua XU1,2, Guo-Ying ZHOU1,2,*()   

  1. 1Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China

    2Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
    and
    3University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-01-11 Accepted:2016-11-11 Online:2017-01-10 Published:2017-01-23
  • Contact: Guo-Ying ZHOU
  • About author:KANG Jing-yao(1991-), E-mail: kangjingyao_nj@163.com

摘要:

灌丛面积增加引起的碳储量增加被认为是我国陆地生态系统碳储量增加的重要原因, 也是陆地生态系统碳汇研究中的一个不确定因素。为了揭示高寒灌丛的碳密度及其分配格局, 该文对青海省不同样地8个金露梅(Potentilla fruticosa)灌丛生态系统各组分的碳密度及分布特征进行了研究。结果表明: 金露梅灌丛的生物碳密度、凋落物碳密度、土壤有机碳密度和总碳密度分别为: 5088.54、542.1、35903.76和41534.4 kg·hm-2。金露梅灌丛灌木层碳主要分配在根部(49.5%-56.1%), 灌木层碳密度占总生物量碳密度的68%以上。草本层碳也主要分配在根部(59.6%-75.1%), 草本层碳密度占总生物量碳密度的22.5%。金露梅灌丛的生物碳密度明显低于中国6种主要灌丛的平均值(10.88 t·hm-2)。在金露梅灌丛中, 土壤碳密度占有最大比例, 约占总碳密度的86.4%。

关键词: 生物碳密度, 凋落物碳密度, 土壤有机碳密度, 总碳密度

Abstract:

Aims Shrub recovery is recognized as an important cause of the increase of carbon stocks in China, and yet there are great uncertainties in the carbon sink capacities of shrubs. Our objectives were to estimate carbon density and its spatial distribution in alpine shrubs.
Methods Eight sites in Potentilla fruticosa dominated shrublands across Qinghai, China were investigated. Plant biomass and carbon content in leaves, branches and stems, and roots were measured to analyze the biomass allocation and carbon density.
Important findings Mean carbon densities in biological carbon, litter, soil and whole ecosystem of P. fruticosa shrublands were 5088.54, 542.1, 35903.76 and 41534.4 kg·hm-2, respectively. Carbon density in the shrub layer was more than 68% of the biological carbon density of the whole ecosystem and was mainly distributed in roots (49.5%-56.1%). Carbon density of the herbaceous layer was 22.5% of the biological carbon density of the whole ecosystem and was also mainly distributed in roots (59.6%-75.1%). The biological carbon density of P. fruticosa shrublands (5.08 t·hm-2) was lower than the average carbon density of shrub communities in China (10. 88 t·hm-2). Soil carbon density contributed the largest proportion (85.8%) of total carbon density in P. fruticosa shrublands.

Key words: biological carbon density, litter carbon density, soil organic carbon density, total carbon density