How Do Thinning Intensities Affect Long-term Growth of Tree Height in a Japanese Cedar Plantation?

Masaki, Takashi; Hitsuma, Gaku; Yagihashi, Tsutomu; Noguchi, Mahoko; Shibata, Mitsue; Takata, Kanenori

doi:10.4005/jjfs.95.227

Cited by 3 publications

(3 citation statements)

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“…38 m at age 94 years (Masaki et al . , ). Since water use becomes more limiting as trees get taller, this upward shift in height and the resulting water stress may partially explain the age‐related growth decline (but see Xu et al .…”

Section: Discussionmentioning

confidence: 99%

“…Some hypotheses propose that age-related physiological constraints may explain the reduction in the diameter growth of trees as they get older (see Smith & Long 2001;Weiner & Thomas 2001;Binkley 2004); the constraints include (i) hydraulic resistance, (ii) reduced allocation of resources to stem growth, (iii) photosynthesis-respiration imbalances, (iv) degradation of the suppression-release response and (v) increased nutrient limitation as stands develop. At the study site, the trees grew from a mean height of c. 25 m at age 45 years to c. 38 m at age 94 years (Masaki et al 2006(Masaki et al , 2013. Since water use becomes more limiting as trees get taller, this upward shift in height and the resulting water stress may partially explain the agerelated growth decline (but see Xu et al 2012).…”

Section: A G E -S I Z E E F F E C Tmentioning

confidence: 99%

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A novel growth model evaluating age–size effect on long‐term trends in tree growth

et al. 2015

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1.One of the major problems in understanding growth trends in long-lived trees is the difficulty of separately quantifying the effects of tree size and age. Careful statistical control of the axiomatic age×size covariation is therefore required to identify long-term trends in tree growth and their drivers, and to predict forests' responses to environmental changes reliably. 2.To address this issue, we present a novel tree growth model: a 'two-dimensional lognormal growth model'. This is an extension of the one-dimensional lognormal growth model, in which tree growth is modelled primarily as a function of size. Our model assesses the trend in tree growth over time by explicitly partitioning the effects of age and size, controlling the covariation. The model is then extended to incorporate the effects of neighbourhood crowding and individual tree variation. 3.To demonstrate our model, we apply it to long-term monitoring data from a mature (104-yearold) plantation of Japanese cedar. Thinning operations of various intensities have been applied to this plantation, and the diameter of each individual tree has been measured repeatedly. 4.We observed a pronounced age-related decline in diameter growth. However, at each age, greater tree size was associated with a higher growth rate. The growth-size curve predicted from the model became flatter with tree age, and the curve's peak shifted rightwards as tree age increased. The model reveals that the sensitivity of a target tree to neighbourhood crowding depends strongly on neighbours' size, and also provides an estimate of among-tree variation in Accepted ArticleThis article is protected by copyright. All rights reserved. growth performance. 5.Although the relationships between growth, size and age in long-lived trees are very complex, our growth model supports the conclusion that it is possible to predict long-term trends in tree growth reliably with respect to both age and size. In addition, the model's flexibility will facilitate more robust testing of species-specific responses to long-term environmental changes.

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Section: Discussionmentioning

confidence: 99%

Section: A G E -S I Z E E F F E C Tmentioning

confidence: 99%

A novel growth model evaluating age–size effect on long‐term trends in tree growth

et al. 2015

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“…Thus, older forests' growth characteristics were not reflected in the yield tables, which caused C stock underestimation for the older forests and the total forests. Although the latest studies found a higher growth rate than expected in older forests 36,37 , few studies on older forests' growth have been conducted in Japan 38,39 . Therefore, intensive observations of older forests should be performed in the future and reflected in the yield tables.…”

Section: Resultsmentioning

confidence: 95%

Carbon stock in Japanese forests has been greatly underestimated

Egusa

Kumagai

Shiraishi

2020

Sci Rep

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An accurate estimate of total forest carbon (c) stock and c uptake is crucial for predicting global warming scenarios and planning co 2 emission reductions. Forest inventory, based on field measurements of individual tree sizes, is considered the most accurate estimation method for forest c stock. Japan's national forest inventory (nfi) provides stand-scale stem volume for the entire forested area based on (1) direct field measurements (m-NFI) and (2) prediction using yield tables (p-NFI). Here, we show that Japanese national and local forestry agencies and some research studies have used p-nfi and greatly underestimated the Japanese forest C stock (58-64%) and net annual C uptake (41-48%). This was because approximately 10% of the forest area was not counted in p-NFI and because the yield tables in p-NFI, which were constructed around 1970, were outdated. For accurate estimation of the forest C stock, yield tables used in p-NFI should be reconstructed or ideally field measurement campaigns for m-nfi should be continued. in the future, appropriate forest management plans are necessary to effectively use the high CO 2 absorption capacity of Japanese forests and these should be compared with other industries' co 2 reduction plans from a cost-benefit perspective.

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Thinning Effects on Changes in Crown Length and the Increment in Diameter at Breast Height of Japanese Cedar Trees in Overcrowded Mature Plantations

2022

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How Do Thinning Intensities Affect Long-term Growth of Tree Height in a Japanese Cedar Plantation?

Cited by 3 publications

References 8 publications

A novel growth model evaluating age–size effect on long‐term trends in tree growth

A novel growth model evaluating age–size effect on long‐term trends in tree growth

Carbon stock in Japanese forests has been greatly underestimated

Thinning Effects on Changes in Crown Length and the Increment in Diameter at Breast Height of Japanese Cedar Trees in Overcrowded Mature Plantations

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