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Estimating individual- and stand-level stem CO2 efflux in a subalpine forest: assessment of different extrapolation methods
Zhao Guang1; Liu Gangcai2; Zhu Wanze2
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AbstractAccurate evaluation of the carbon release by stems is an important objective of many forest carbon cycling studies. However few studies have assessed the applicability of different extrapolation methods of stem CO2 efflux. Therefore a reliable estimation method that considers both temporal and vertical variations is required. To overcome this problem we conducted a field experiment to measure the stem CO2 efflux rate of Abies fabri in subalpine forests and evaluated the effect of three extrapolation methods (area-based estimation volume-based estimation and integral method) on accurate estimation of stem respiration at the individual and stand levels. First we calculated the stem carbon loss at the individual level using the three extrapolation methods and discovered that the diameter at the breast height (DBH) played a major role in determining the magnitudes of stem respiration. Second we summarized the relationship between the stem CO2 efflux rate (E-s) and the DBH from previous studies. The E-s for small diameter stems tended to increase with height but remained constant in trees with large DBH implying a role of DBH threshold in determination of the E-s effect. Our calculations from three estimation methods supported the hypothesis that a threshold accounted for the different vertical variations in E-s. Specifically the vertical variation of E-s primarily presented as two categories: E-s decreased with the stem height for small diameters (DBH < 30 or 40 cm) or E-s showed little change for stem height for large diameters (DBH > 60 cm). Based on these trends we suggest a two-part approach to scale the individual tree stem CO2 efflux in which a volume-based scaling method is recommended for trees with small DBH (0-30 or 40 cm) and an area-based estimation is suitable for stems with large DBH (> 30 or 40 cm). Using this approach the annual amount of stem carbon release for an immature forest and a mature forest were estimated as 1.80 and 4.81 t C ha(-1) year(-1) respectively.
KeywordStem CO2 efflux Vertical variation Scaling Carbon loss
Indexed BySCI
WOS IDWOS:000494830600007
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Document Type期刊论文
Corresponding AuthorLiu Gangcai; Zhu Wanze
Affiliation1.Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
2.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, No. 9, Block 4, Renminnanlu Road, Chengdu 610041, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Zhao Guang,Liu Gangcai,Zhu Wanze. Estimating individual- and stand-level stem CO2 efflux in a subalpine forest: assessment of different extrapolation methods[J]. TREES-STRUCTURE AND FUNCTION,2019,33(6):1603-1613.
APA Zhao Guang,Liu Gangcai,&Zhu Wanze.(2019).Estimating individual- and stand-level stem CO2 efflux in a subalpine forest: assessment of different extrapolation methods.TREES-STRUCTURE AND FUNCTION,33(6),1603-1613.
MLA Zhao Guang,et al."Estimating individual- and stand-level stem CO2 efflux in a subalpine forest: assessment of different extrapolation methods".TREES-STRUCTURE AND FUNCTION 33.6(2019):1603-1613.
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