Abstract
The tissue structure of a bamboo stem (culm) differs from that of woody species, exhibiting a large cavity in the internode surrounded by a cortex with high silica concentration. Thus, to obtain an accurate estimation of the necromass, as well as carbon (C) and nitrogen (N) stocks in dead bamboo culms, we examined the basic characteristics of culm structure as well as the C and N concentrations of decomposing culms of Phyllostachys bambusoides and P. heterocycla. We collected dead culms of the two bamboo species from 15 bamboo stands in central and southwestern Japan, and analyzed the relationship between the ratio of wall volume to culm disk volume and culm diameter, as well as the changes of C and N concentrations in dead culms with wall density, which can be used as an indicator of the degree of decomposition. The ratio of wall volume to culm volume tended to decrease with increasing culm diameter for both species. The C concentration did not change, but the N concentration increased with decreasing wall density. The wall density was related to the C/N ratio, which is a chemical parameter of the degree of decomposition. The culm structure should be considered when estimating culm density. The mean C concentration can be used for estimating the C stock of decomposing culms irrespective of decomposition level. N concentration, however, should be determined according to decomposition level for N stock estimation.
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Acknowledgements
We are grateful to researchers of the prefectural forest research institutes for collecting the dead culm samples. We thank the members of the Department of Forest Site Environment, the Bureau of Climate Change, and the Department of Wood Processing of the Forestry and Forest Products Research Institute for their help with this research. In particular, we thank Y. Itakura (Department of Wood Processing, Forestry and Forest Products Research Institute) and H. Takahashi, A. Tagawa, M. Nemoto, and Y. Katsui (Department of Forest Site Environment, Forestry and Forest Products Research Institute) for analyzing dead culm samples. This study was supported by the National Forest Soil Carbon Inventory managed by the Forestry Agency in Japan.
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Supplement table 1
Coefficient of explanatory variable in general linear model (Formula 1′–4′). The coefficient means “b” in each formula. Asterisk shows significant difference from 0 (*, p ≦ 0.05; **, p ≦ 0.01) (DOC 53 kb) (DOC 53 kb)
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Results of linear and non-linear regressions with Gaussian errors. No random effect was incorporated into the linear and non-linear regressions (DOC 64 kb) (DOC 64 kb)
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Ugawa, S., Miura, S., Matsuura, Y. et al. Characteristics of culm structure and carbon and nitrogen concentrations in dead bamboo culms of two Phyllostachys species. Plant Soil 347, 269–278 (2011). https://doi.org/10.1007/s11104-011-0844-5
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DOI: https://doi.org/10.1007/s11104-011-0844-5