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Trees

, Volume 33, Issue 6, pp 1603–1613 | Cite as

Estimating individual- and stand-level stem CO2 efflux in a subalpine forest: assessment of different extrapolation methods

  • Guang Zhao
  • Gangcai LiuEmail author
  • Wanze ZhuEmail author
Original Article
  • 59 Downloads

Abstract

Accurate 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 (Es) and the DBH from previous studies. The Es 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 Es effect. Our calculations from three estimation methods supported the hypothesis that a threshold accounted for the different vertical variations in Es. Specifically, the vertical variation of Es primarily presented as two categories: Es decreased with the stem height for small diameters (DBH < 30 or 40 cm), or Es 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.

Keywords

Stem CO2 efflux Vertical variation Scaling Carbon loss 

Notes

Acknowledgements

The authors thank all the workers of the Alpine Ecosystem Observation and Experiment Station of the Gongga Mountain, Chinese Academy of Sciences for providing help during field measurements.

Author contribution statement

GZ and WZ designed the study. All authors contributed to the writing of the manuscript, critical evaluation of the findings and synthesis.

Funding

This work was supported by the National key research and development program of China (2017YFC0505004); by the 135 Strategic Program of Institute of Mountain Hazards and Environment (SDS-135-1707).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interests.

Supplementary material

468_2019_1883_MOESM1_ESM.docx (788 kb)
Supplementary material 1 (DOCX 787 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina
  2. 2.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences and Ministry of Water ResourcesChengduChina

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