Allométrie du bois de cœur et de l’aubier pour sept espèces d’arbres tempérées chinoises

Wang, Xingchang; Wang, Chuankuan; Zhang, Quan‐Zhi; Quan, Xiankuai

doi:10.1051/forest/2009131

Cited by 23 publications

(17 citation statements)

References 27 publications

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“…In the present study, diameter at breast height (DBH) had the highest correlation with heartwood radius, area and volume among the four tree growth factors tested (DBH, tree height, height to crown base, and crown width), and the fitted heartwood volume model based on DBH could predict accurately for T. grandis trees of different social status. The findings were in accordance with Fernandez-Solis's [12] study on T. grandis and Wang's [33] study on several temperate tree species, where DBH was also demonstrated as the most commonly used and the most effective variable for estimating heartwood volume.…”

Section: Relationship Between Tree Growth and Heartwood And Sapwood Asupporting

confidence: 89%

Horizontal and Vertical Distributions of Heartwood for Teak Plantation

Yang

Zhao

et al. 2020

Forests

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Tectona grandis is a valuable timber species with heartwood that is used worldwide. Most of the previous studies on its heartwood and sapwood have focused on dominant or mean trees, while trees with different social status might show different vertical and horizontal distributions of heartwood and sapwood. Studies on their heartwood and sapwood properties could be conducive to increasing heartwood yield at stand level. In 31-year-old plantations of T. grandis in southwest Guangxi, China, the trees were divided into three groups including dominant, mean and suppressed trees. Stem analysis was conducted for sampled trees in each of these groups to explore the differences in the horizontal and vertical distribution of their heartwood and sapwood. The results indicated that the heartwood radius, heartwood and sapwood areas of T. grandis showed significant differences in horizontal and vertical directions among trees of different social status. Heartwood began to form when xylem radius was 2-3 cm, and the heartwood radius ratio tended to be stable when the xylem radius reached about 8 cm. Heartwood radius and area, sapwood area and section heartwood volume all decreased with increasing tree height. The ratios of heartwood radius and area were relatively stable for sections under 50% of tree height. The sapwood width did not vary largely in horizontal and vertical directions among the three social status tree groups, which mainly fluctuated in the range of 1-4 cm. The heartwood volume proportions for dominant, mean and suppressed trees were 60%, 55% and 51%, respectively. There was a significant exponential relationship between heartwood volume and diameter at breast height (DBH) regardless of social status. The model HV = 0.000011 × DBH 2.9787 (R 2 = 0.8601) could accurately estimate heartwood volume for all T. grandis with different social statuses at this age. These findings could provide evidence for stand management and high-quality and large-sized timber production of T. grandis.Forests 2020, 11, 225 2 of 12 T. grandis has been in China for nearly 200 years, and has now been extensively planted in more than 60 counties or cities in 10 provinces of southern China, with a planting area of 35,000 hectares [8].Heartwood normally determines the value of wood [9], while sapwood is closely correlated with the physiological functions of trees [10]. There are a number of references on the heartwood of dominant or mean trees for T. grandis. For example, Pérez and Kanninen [11] studied the effects of thinning intensities on the heartwood volume of dominant T. grandis trees; Tewari and Mariswamy's [1] study showed that the proportion of heartwood increased while sapwood proportion was almost constant with increasing diameter at breast height (DBH) for T. grandis. In addition, Fernández-Sólis et al. [12] predicted the heartwood formation process of T. grandis based on randomly selected trees in each age class. However, mean and suppressed trees also account for a large proportion in stand [13] and their role in wood productio...

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Section: Relationship Between Tree Growth and Heartwood And Sapwood Asupporting

confidence: 89%

Horizontal and Vertical Distributions of Heartwood for Teak Plantation

Yang

Zhao

et al. 2020

Forests

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“…other angiosperm species [13,14]). This feature differs significantly from the considered conifers, which have a wider proportion of sapwood [61,62] (cf. also observation of the last ring accounting for only 15%-20% of the hydraulic conductivity of Scots pine [63]), whereas birch does not form a heartwood at all.…”

Section: Climatic Response and Growth Modeling Of Treesmentioning

confidence: 59%

Response of Four Tree Species to Changing Climate in a Moisture-Limited Area of South Siberia

Babushkina

Zhirnova

Belokopytova

et al. 2019

Forests

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The response of vegetation to climate change is of special interest in regions where rapid warming is coupled with moisture deficit. This raises the question of the limits in plants' acclimation ability and the consequent shifts of the vegetation cover. Radial growth dynamics and climatic response were studied in Scots pine (Pinus sylvestris L.), Siberian larch (Larix sibirica Ledeb.), and silver birch (Betula pendula Roth.) in the forest-steppe, and for Siberian elm (Ulmus pumila L.) in the steppe of South Siberia, as indicators of vegetation state and dynamics. Climate-growth relationships were analyzed by the following two approaches: (1) correlations between tree-ring width chronologies and short-term moving climatic series, and (2) optimization of the parameters of the Vaganov-Shashkin tree growth simulation model to assess the ecophysiological characteristics of species. Regional warming was accompanied by a slower increase of the average moisture deficit, but not in the severity of droughts. In the forest-steppe, the trees demonstrated stable growth and responded to the May-July climate. In the steppe, elm was limited by moisture deficit in May-beginning of June, during the peak water deficit. The forest-steppe stands were apparently acclimated successfully to the current climatic trends. It seems that elm was able to counter the water deficit, likely through its capacity to regulate transpiration by the stomatal morphology and xylem structure, using most of the stem as a water reservoir; earlier onset; and high growth rate, and these physiological traits may provide advantages to this species, leading to its expansion in steppes.

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“…Moore et al (2008) reported that annual stem diameter increment explained 42-74% of the variation in E S for P. taeda. Wang et al (2010) reported that sapwood area and sapwood width were positively correlated with DBH of seven tree species. In addition, larger stems have larger root systems and could potentially transport more CO 2 from their root systems upwards in the xylem into the main stem Aubrey and Teskey 2009).…”

Section: Discussionmentioning

confidence: 99%

Stem CO2 efflux of ten species in temperate forests in Northeastern China

Yang

Teskey²,

Wang

2012

Trees

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Stem CO 2 efflux (E S ) is an important component of forest ecosystem carbon budgets and net ecosystem CO 2 exchange, but little is known about E S in temperate forests in Northeastern China, an area with a large extent of forest. We measured E S along with stem temperature at 1 cm depth (Ts) over a 9 month period in 2007 on ten dominant tree species of secondary forests of the region. Other measurements included the autotrophic component of soil CO 2 efflux (E A ) and stem diameter at breast height (DBH). Our objectives were to (1) examine the seasonal patterns and species differences in E S , and (2) determine the correlations between E S and Ts, DBH and E A . Mean E S for the measurement period ranged from 1.09 to 1.74 lmol CO 2 m -2 s -1 among the ten species. The sensitivity of E S to Ts (Q 10 ) ranged from 1.87 to 2.61. Across the ten species 57-89% of variation in E S was explained by T S and DBH. There was also a linear relationship between mean E S and E A . E S was better predicted by Ts in the dormant season than the growing season, indicating that additional factors such as growth respiration and internal transport of CO 2 in the xylem became more important contributors to E S during the growing season. Stem CO 2 efflux increased, and Q 10 decreased, with increasing DBH in all species. Although temperature exerts strong control on the rate of cellular respiration, we conclude that in tree stems in situ, T S , DBH and many other factors affect the relationship between CO 2 evolution by respiring cells and the diffusion of CO 2 to the stem surface.

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Allométrie du bois de cœur et de l’aubier pour sept espèces d’arbres tempérées chinoises

Cited by 23 publications

References 27 publications

Horizontal and Vertical Distributions of Heartwood for Teak Plantation

Horizontal and Vertical Distributions of Heartwood for Teak Plantation

Response of Four Tree Species to Changing Climate in a Moisture-Limited Area of South Siberia

Stem CO2 efflux of ten species in temperate forests in Northeastern China

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