Abstract
Net primary production (NPP) is an important index for evaluating the patterns, processes, and dynamics of carbon cycling in forest ecosystems. In this study, we estimated the NPP in a warm-temperate old-growth evergreen broad-leaved forest in southwestern Japan. The estimation was based on four compartments: aboveground stand increment (ΔM), aboveground litterfall (Lf), fine-root production (Fr), and coarse root increment (ΔCr). The data for ΔM and ΔCr were collected from a permanent 200 × 200 m2 plot over a 4-year interval, while Lf and Fr were collected over a 1-year interval. The NPP was 4.65 g m−2 day−1, of which ΔM accounted for 25.2 %, Lf accounted for 38.7 %, Fr accounted for 33.4 %, and the remaining 2.7 % was attributed to ΔCr. There was a significant regression between aboveground litterfall and fine-root production (R 2 = 0.65, P < 0.05). Fine-root decomposition (0.66 g m−2 day−1) accounted for 14.2 % of the NPP, leading to a higher belowground NPP in the present study compared with that in other forests. We conclude that an estimation of the decomposition of dead fine-roots by the continuous inflow method must be included to improve the accuracy of NPP estimations for forest ecosystems.
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Acknowledgments
We thank Prof. T.V Con from Vietnamese Academy of Forest Sciences for guideline on statistical analysis and anonymous reviewers for constructive comments on the manuscript.
Funding
This research is co-funded by Long-term monitoring of forest carbon dynamics in East Asia [EA-FDPN Phase II]” from the Global Environmental Research Account for National Institute, Ministry of the Environment Japan (MOEJ), ‘‘Evaluation, Adaptation and Mitigation of Global Warming in Agriculture, Forestry and Fisheries: Research and Development’’, Ministry of Agriculture, Forestry and Fisheries of Japan, ‘‘Monitoring-site 1000 Project’’ MOEJ, and Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant number 106-NN.06-2013.01.
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Van Do, T., Sato, T., Saito, S. et al. Fine-root production and litterfall: main contributions to net primary production in an old-growth evergreen broad-leaved forest in southwestern Japan. Ecol Res 30, 921–930 (2015). https://doi.org/10.1007/s11284-015-1295-x
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DOI: https://doi.org/10.1007/s11284-015-1295-x