Wood density and carbon and nitrogen concentrations in deadwood of Chamaecyparis obtusa and Cryptomeria japonica(Environment)
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概要
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Estimating carbon (C) and nitrogen (N) stocks in deadwood in forests nationwide is required for understanding large-scale C and N cycling. To do so requires estimated values of wood density and C and N concentrations. Additionally, parameters that show variation should be examined. In this study, we clarified the estimated values and the variation in three parameters in each decay class of each of two tree species and examined whether dead log diameter and region contribute to variation in the parameters. Data were collected from 73 Chamaecyparis obtusa (Sieb. et Zucc.) Endl. plantations and 66 Cryptomeria japonica D. Don plantations throughout Japan. Wood densities decreased from 386 to 188kg m^<-3> for C. obtusa and from 334 to 188kg m^<-3> for C. japonica in decay classes 1-4. The variation in wood density increased with decay class, and the coefficient of variance increased from 13.9% to 46.4% for C. obtusa and from 15.2% to 48.1% for C. japonica. The N concentrations increased from 1.04 to 4.40g kg^<-1> for C. obtusa and from 1.11 to 2.97g kg^<-1> for C. japonica in decay classes 1-4. The variation in N concentration increased with decay class, and the coefficient of variance increased from 51.9% to 76.7% for C. obtusa and from 50.3% to 70.4% for C. japonica. Log diameter and region contributed to variations in wood density and N concentration in decay classes 1 and 2 for C. obtusa and C. japonica. However, no relationship was observed between regional climates and the two parameters. In contrast, C concentrations ranged from 507 to 535g kg^<-1> and were stable with much lower coefficients of variance throughout the decay classes for both tree species. Thus, we recommend that the same C concentration can be adapted for all decay classes of both tree species.
- 一般社団法人日本土壌肥料学会の論文
- 2012-08-00
著者
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Ugawa Shin
Department Of Forest Site Environment Forestry And Forest Products Research Institute
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Sakai Yoshimi
Forestry And Forest Products Research Institute
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ISHIZUKA Shigehiro
Forestry and Forest Products Research Institute
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Sakai Yoshimi
Department Of Forest Site Environments Forestry And Forest Products Research Institute
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Ishizuka Shigehiro
Forestry And Forest Products Res. Inst. Ibaraki Jpn
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Takahashi Masamichi
Forestry And Forest Products Res. Inst. Ibaraki Jpn
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TAKENAKA Chisato
Department of Biosphere Resources Science, Graduate School of Bioagricultural Sciences, Nagoya University
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ISHIZUKA Shigehiro
Kyushu Research Center, Forestry and Forest Products Research Institute
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UGAWA Shin
Department of Forest Site Environment, Forestry and Forest Products Research Institute:(Present office)Faculty of Agriculture, Kagoshima University
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TAKAHASHI Masamichi
Forest Products Research Institute
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SAKAI Yoshimi
Department of Forest Site Environment, Forestry and Forest Products Research Institute
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