Abstract
Purpose
This study quantified the above- and belowground carbon (C) stocks across a chronosequence of spruce (Picea asperata) plantations established on cutovers and explored the turning point after which the increase in biomass C slowed or biomass C decreased for guiding forest management.
Materials and methods
We assessed above- and belowground plant biomass stocks at 11 sites in three regions, representing 12- to 46-year-old spruce plantations established on clear-cut areas in the eastern Tibetan Plateau, China. Biomass and C stocks of trees, understory vegetation, and forest floor litter were determined from plot-level inventories and destructive sampling. Fine root (<2 mm) biomass and mineral soil organic C (SOC) stock were estimated from soil cores. Tree biomass was quantified using allometric equations based on diameter at breast height (DBH) and height (H).
Results and discussion
Plant biomass C stocks in spruce plantations rapidly increased from 12 to 20 years at a rate of 7.8 Mg C ha−1 year−1, but decreased from 25 to 46 years at a rate of 0.79 Mg C ha−1 year−1. SOC stocks in spruce plantations gradually decreased from 12 to 46 years at a rate of 4.4 Mg C ha−1 year−1. Total C stock in the ecosystem remained unchanged for the first 20 years after the planting of spruce on cutovers, because the buildup of C stock in spruce biomass during the first 20 years was offset by the decrease in SOC. From 21 to 46 years after the reforestation, ecosystem C stock even decreased at a rate of 5.2 Mg C ha−1 year−1. The contribution of the understory vegetation, forest floor litter, and fine root to ecosystem C stock was low (<5.0 %) in the spruce plantations.
Conclusions
Ecosystem C stock in the spruce forest established on the cutover in the eastern Tibetan Plateau was related to stand age. During the first 20 years, this ecosystem was C neutral. However, aged (20–46 years) spruce plantation ecosystem can be a C source if no management was implemented to revitalize tree growth, promote understory vegetation, and enhance SOC accumulation.
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Acknowledgments
We thank the subject editor, two anonymous reviewers, and editor-in-chief for their valuable comments and suggestions on the manuscript of the paper. This study was supported by the National Natural Science Foundation of China (grant no. 31270492), the Strategic Priority Research Program of the CAS (grant no. XDA05070306), and the National Science & Technology Pillar Program in 12th Five-year Plan of China (grant no. 2011BAC09B04-02). We are grateful to the Markang Forestry Bureau, Miyaluo Forestry Bureau, and Jinchuan Forestry Bureau, for the help and support in their field survey.
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Electronic Supplementary Material 1: Table S1
The allometric equations for calculating biomass of various components of trees in the studied spruce plantations (Zhao et al. 2013) (DOCX 21 kb)
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Pang, X., Huang, J., Zhao, Q. et al. Ecosystem carbon stock across a chronosequence of spruce plantations established on cutovers of a high-elevation region. J Soils Sediments 17, 2239–2249 (2017). https://doi.org/10.1007/s11368-016-1415-4
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DOI: https://doi.org/10.1007/s11368-016-1415-4