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Carbon isotopic composition,turnover and origins of soil co2 in a monsoon evergreen broadleaf forest in the Dinghushan Biosphere Reservoir,South China

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Science Bulletin 2010年第23期55卷 2551-2559页

作者： DING Ping1,SHEN ChengDe1,2,WANG Ning1,YI WeiXi1,DING XingFang2,FU DongPo2,LIU KeXin2 & ZHAO Ping3 1Key Laboratory of Isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China 2State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China 3South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,China

Carbon isotopic compositions of soil co2 in rainy season (July) from two natural soil profiles (DHLS & DHS) in the monsoon evergreen broadleaf forest in the Dinghushan Biosphere Reservoir (DBR),South China,are *** and origins of soil co2 are preliminarily discussed in this *** show that the content of soil co2 varies between 6120 and 18718 ppmv,and increases with increasing depth until 75 cm,and then it *** DHLS,soil co2 δ 13C ranges from -24.71‰ to -24.03‰,showing a significant inverse correlation (R2=0.91) with the soil co2 content in the same *** to a model related to soil co2 δ 13C,the soil co2 is mainly derived from the root respiration (>80%) in *** in DHS,where soil co2 δ 13C ranges from -25.19‰ to -22.82‰,soil co2 is primarily originated from the decomposition of organic matter (51%–94%),excluding the surface layer (20 cm,90%).Radiocarbon data suggest that the carbon in soil co2 is modern carbon in both DHLS and *** in 14C ages between the "oldest" and "youngest" soil co2 in DHLS and DHS are 8 months and 14 months,respectively,indicating that soil co2 in DHLS has a faster turnover rate than that in *** Δ14C values of soil co2,which range between 100.0‰ and 107.2‰ and between 102.5‰ and 112.1‰ in DHLS and DHS,respectively,are obviously higher than those of current atmospheric co2 and SOC in the same layer,suggesting that soil co2 is likely an important reservoir for Bomb-14C in the atmosphere.

关键词： Dinghushan Biosphere Reservoir soil co2 turnover Bomb-14co2 13C & 14C

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Characteristics of co_2 in unsaturated zone(～90 m) of loess tableland, Northwest China

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Acta Geochimica 2017年第3期36卷 489-493页

作者： Chao Song Guilin Han Yingchun Shi congqiang Liu Pan Wang School of Water Resources and Environment China University of Geosciences (Beijing) The Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological Sciences

In order to observe co_2 characteristics in the unsaturated zone of loess tableland and further understand the carbon cycle,a series of tubes for gas monitoring and sampling were installed in an approximately 90-m deep Qiushe loess section of Lingtai county,Northwestern *** results show that the concentration of co_2 was higher in loess than in the atmosphere,reaching a maximum of 6970 lmol·mol^(-1).co_2 concentrations in loess were higher in summer than in *** co_2 in loess was related to organic carbon decomposed by microbes,and to the Caco_3–H_2O–co_2 system in the interface between the saturated and unsaturated zones.

关键词： Unsaturated zone soil co2 Carbon stock in deep loess Quantitative paleoclimate reconstruction Loess

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