Self-thinning and size variation in a sugi (Cryptomeria japonica D. Don) plantation

Ogawa, Kazuharu; Hagihara, Akio

doi:10.1016/s0378-1127(02)00062-2

Cited by 37 publications

(25 citation statements)

References 13 publications

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“…Weiner and Whigham 1988;Kikuzawa 1988Kikuzawa , 1999Ogawa and Hagihara 2003). Tree density decreased successively owing to the death of lower-rank trees in phytomass, i.e.…”

Section: Discussionmentioning

confidence: 99%

The self-thinning process in mangrove Kandelia obovata stands

2008

Self Cite

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The self-thinning process was monitored in crowded Kandelia obovata Sheue, Liu & Yong stands over four years. The frequency distribution of tree phytomass was an L-shape, which was kept over the experimental period. Spearman's rank correlation coefficient for phytomass decreased as the time span of the comparison became longer, a result which indicates that the rank of phytomass changes as stands grow. Death of trees resulted from one-sided competition, i.e., death occurred in lower-rank trees. Surviving trees continued to grow. Whatever the current spatial distribution of the trees, death occurred randomly and the spatial distribution gradually became close to random as stands grew. The self-thinning exponent was 1.46, which can be regarded as evidence in favor of the 3/2 power law of self-thinning. Relative growth rate, RGR, decreased in proportion to decreasing relative mortality rate, RMR, with a proportionality constant of 1.57, which was not significantly different from the slope of the self-thinning exponent. This experimental result probably justifies the assumption that the ratio of RGR to RMR in the mean phytomass-density trajectory for any self-thinning population with different densities becomes constant as the growth stage progresses.

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“…Weiner and Whigham 1988;Kikuzawa 1988Kikuzawa , 1999Ogawa and Hagihara 2003). Tree density decreased successively owing to the death of lower-rank trees in phytomass, i.e.…”

Section: Discussionmentioning

confidence: 99%

The self-thinning process in mangrove Kandelia obovata stands

2008

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“…In this study, we assumed two models in terms of local competition: one included one-sided competition (i.e., a larger tree suppresses the growth of a smaller tree, but a smaller tree does not: e.g., Weiner 1986;Seiwa and Kikuzawa 1987;Thomas and Weiner 1989;Kohyama 1992Kohyama , 1993Ogawa and Hagihara 2003;Bouer et al 2004), and the other included two-sided competition (e.g., Yokozawa and Hara 1992;Kikuzawa and Umeki 1996). Focusing on past studies for Cryptomeria japonica plantations, Mizoue et al (2002) and Tange et al (1990) found that a tree near a larger tree had much smaller growth than average.…”

Section: Discussionmentioning

confidence: 99%

“…Kohyama (1992Kohyama ( , 1993) presented a simple model of onesided competition for natural forests, which assumed that the growth of dbh of a tree is affected by the basal area of neighboring trees having a greater dbh, and he successfully modeled the dynamics of size structure in the stand. Similarly, to analyze the effects of one-sided local competition on the growth of trees, the basal area of larger trees near the focal trees is used (e.g., Weiner 1986;Seiwa and Kikuzawa 1987;Thomas and Weiner 1989;Ogawa and Hagihara 2003;Bouer et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Long-term growth analyses of Japanese cedar trees in a plantation: neighborhood competition and persistence of initial growth deviations

Masaki

Mori

Kajimoto

et al. 2006

Journal of Forest Research

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The individual growth of tree diameter at breast height (dbh) is analyzed in an even-aged plantation of Cryptomeria japonica from stand age of 45 to 94 years, to examine how the growth of individual trees has been affected by the changes in spacing resulting from thinning operations. At any age, a significant proportion (0.37-0.46) of the variation in dbh growth during a 5-11-year period was explained by dbh at the beginning of the period, probably due to greater leaf mass of larger trees. Next, either one-sided or two-sided competition was added to the model, by calculating the basal area (BA) of neighboring trees around each tree within a given radius or BA for trees having larger dbh than the focal tree within the radius. After preliminary analyses, a radius of 8 m was selected as the critical range for tree competition. Although both types of competition explained a significant proportion (0.09-0.43) of growth variation, one-sided competition was not significant at ages greater than 54 years. Based on the model at 45 years of age, the initial deviation of growth rate for each tree from the predicted rate was calculated and added to the models as a third variable. This raised the coefficient of determination up to 0.50-0.74. These findings have practical significance for forest plantation management, particularly for controlling the growth of standing trees via thinning, to produce high-quality timber in the future.

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“…If a plantation is not thinned, as the canopy closes, the smaller trees are shaded out by neighboring larger trees and eventually die (Ogawa and Hagiahara 2003). Therefore, thinning management decreases mortality and DCWD, thus consolidating DB.…”

Section: Npp and Soil Respiration In Japanese Cedar Plantationsmentioning

confidence: 99%

Biometric-based estimation of net ecosystem production in a mature Japanese cedar (Cryptomeria japonica) plantation beneath a flux tower

et al. 2010

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Quantification of carbon budgets and cycling in Japanese cedar (Cryptomeria japonica D. Don) plantations is essential for understanding forest functions in Japan because these plantations occupy about 20% of the total forested area. We conducted a biometric estimate of net ecosystem production (NEP) in a mature Japanese cedar plantation beneath a flux tower over a 4-year period. Net primary production (NPP) was 7.9 Mg C ha(-1) year(-1) and consisted mainly of tree biomass increment and aboveground litter production. Respiration was calculated as 6.8 (soil) and 3.3 (root) Mg C ha(-1) year(-1). Thus, NEP in the plantation was 4.3 Mg C ha(-1) year(-1). In agreement with the tower-based flux findings, this result suggests that the Japanese cedar plantation was a strong carbon sink. The biometric-based NEP was higher among most other types of Japanese forests studied. Carbon sequestration in the mature plantation was characterized by a larger increment in tree biomass and lower mortality than in natural forests. Land-use change from natural forest to Japanese cedar plantation might, therefore, stimulate carbon sequestration and change the carbon allocation of NPP from an increment in coarse woody debris to an increase in tree biomass.

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Self-thinning and size variation in a sugi (Cryptomeria japonica D. Don) plantation

Cited by 37 publications

References 13 publications

The self-thinning process in mangrove Kandelia obovata stands

The self-thinning process in mangrove Kandelia obovata stands

Long-term growth analyses of Japanese cedar trees in a plantation: neighborhood competition and persistence of initial growth deviations

Biometric-based estimation of net ecosystem production in a mature Japanese cedar (Cryptomeria japonica) plantation beneath a flux tower

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