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松嫩草原不同种群密度羊草草地生态系统有机碳分配

张海艳1,2,神祥金1,2,李飞1,2,关胜超1,2,周道玮1**   

  1. (1中国科学院东北地理与农业生态研究所, 长春 130102; 2中国科学院大学, 北京 100049)
  • 出版日期:2014-09-10 发布日期:2014-09-10

Partitioning of organic carbon in Leymus chinensis grossland ecosystems with different population densities in Songnen grassland, China.

ZHANG Hai-yan1,2, SHEN Xiang-jin1,2, LI Fei1,2, GUAN Sheng-chao1,2, ZHOU Dao-wei1**   

  1. (1Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2014-09-10 Published:2014-09-10

摘要:

以松嫩草原自然生长状态下不同种群密度羊草生态系统为研究对象,采用野外取样与室内分析相结合的方法,研究其生物量分配、各构件有机碳含量及贮量、土壤有机碳含量及储量的变化特征。结果表明:随着种群密度的增加,羊草群落的根、茎、叶、根茎生物量以及根冠比无显著差异,而生殖构件生物量显著减少(P<0.05);种群密度对羊草构件的有机碳含量无显著影响;随着种群密度的增加,羊草生殖构件有机碳贮量显著降低(P<0.05),而对羊草非生殖构件无显著影响;种群密度影响土壤碳截获能力,低种群密度羊草生态系统碳截获能力更强,在土壤深层(20~100 cm)则更为显著(P<0.05)。
 

关键词: 碳排放, 农作物, 碳足迹, 中国, 空间分布

Abstract: In this study, we investigated the biomass distribution, organic carbon concentration and stock of each plant component, and soil organic carbon concentration and stock of Leymus chinensis grossland  ecosystems with different population densities in Songnen grassland by combing field sampling with laboratory analysis. Results showed that the biomass of L. chinensis reproductive components decreased obviously with the increase of population density; however, there were no significant differences in the biomass of root, stems, leaves, rhizome and shoot ratio among L. chinensis communities of different population densities. Population density had no significant effects on the organic carbon concentration of L. chinensis components. With the increase of population density, the organic carbon stock of L. chinensis reproductive components reduced significantly (P<0.05), while the population density had no significant effects on nonreproductive components. Population density influenced the capacity of soil carbon sequestration. The low population density of L. chinensis  grossland  ecosystems had a higher carbon sequestration capacity than the high population density ecosystems, especially for the 20-100 cm soil depth (P<0.05).

Key words: China, crops, greenhouse gas emissions, spatial distribution, carbon footprint