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《Acta Ecologica Sinica》 2018-24
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Carbon stable isotopic characteristics of organic matter in the leaf-litter-soil continuum of dominant tree species in a secondary forest in northwestern Guizhou

YU Yanghua;CHENG Wen;YANG Danli;ZHONG Xinping;School of Karst Science/State Engineering Technology Institute for Karst Decertification Control,Guizhou Normal University;School of Geography and Environmental Science,Guizhou Normal University;  
The natural abundance of stable carbon isotopes( δ13C) can reveal the dynamic changes of organic carbon over time and illustrate the characteristics of functional changes in ecosystems. Using 14 dominant tree species in the secondary forest in northwestern Guizhou,the organic carbon contents and δ13C values in leaves,litter,and root-zone soil were measured to analyze the correlation between carbon content and δ13C abundance at different levels. The results showed that:the carbon content of leaves of the 14 dominant tree species was 404.67—487.14 g/kg. Generally,the carbon content was higher in conifers and lower in evergreen shrubs. The δ13C value was-31.2‰ to-27.1‰,and the change with life form was not obvious. The litter carbon content was 414.62—561.31 g/kg,which was consistent with the change of leaf carbon content; the δ13C value was-31.5‰ to-27.3‰,and the changing characteristics of life form in tree species were not obvious. The carbon content in root-zone soil was 10.02—91.59 g/kg,the δ13C value was from-26.8‰ to-22.5‰. The carbon content was higher in deciduous trees,such as Rhododendron simsii and Populus alba. There was no significantcorrelation between the carbon content of leaves,litter,and root-zone soil at different levels and the abundance of δ13C value. A positive correlation was found between the abundance of δ13C value and carbon content at different levels. The results could help to reveal fundamental information of the carbon cycle process in forest ecosystems and provide a theoretical basis for forest vegetation restoration.
【Fund】: 国家重点研发计划项目课题(2016YFC0502601);; 贵州省科技计划项目(黔科合LH字[2016]7201号)
【CateGory Index】: S718.5
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