TRACHEID SIZE AND ANTICLINAL DIVISIONS IN THE CAMBIUM OF LODGEPOLE PINE

1964 ◽  
Vol 42 (9) ◽  
pp. 1105-1118 ◽  
Author(s):  
M. W. Bannan
Keyword(s):  
Growth Rate ◽  
North America ◽  
Lodgepole Pine ◽  
Ring Width ◽  
Cell Length ◽  
Cell Diameter ◽  
Western North America ◽  
Breast Height ◽  
Anticlinal Division ◽  
Maximum Cell

Tracheid size and rate of anticlinal divisions in the cambium were determined for lodgepole pine at several sites in western North America ranging in elevation from 3000 to 11,000 feet. The determinations were made at breast height in trees with boles 10–20 in. in diameter. The base rate of anticlinal division was low as compared with other conifers, the average being 0.8 divisions per cm of xylem increment when ring width exceeded 1.5 mm. The frequency of division increased as annual xylem production fell below 1 mm, and rose sharply with continued reduction in ring width under 0.3 mm. Maximum cell length was associated with a ring width of 1 mm, and the length decreased in both wide and narrow rings. The tangential width of the tracheids likewise lessened as ring width fell below 1 mm, the decline becoming accentuated with continued waning of growth to less than 0.3 mm. Cell diameter differed from the overall mean by more than 1 µ at only one site after allowance was made for dissimilarities in growth rate. Cells were shortest at the two highest sites. The newly formed partition in pseudotransverse division tended to be inclined in the same direction in neighboring cells, but the percentage of divisions deviating from the preferred orientation was higher than in other conifers. Reversals in direction of tilt occurred after varied intervals, these apparently being corrective in function.

TRACHEID SIZE AND RATE OF ANTICLINAL DIVISION IN THE CAMBIUM OF CUPRESSUS

1963 ◽  
Vol 41 (8) ◽  
pp. 1187-1197 ◽  
Author(s):  
M. W. Bannan
Keyword(s):  
Arid Regions ◽  
Ring Width ◽  
Cell Length ◽  
Small Cells ◽  
Cell Multiplication ◽  
Mature Trees ◽  
Cambial Cell ◽  
Interspecific Differences ◽  
Anticlinal Division ◽  
Maximum Cell

Differences of considerable magnitude occur in the tracheid dimensions of North American species of Cupressus. In general the species in arid regions (C. arizonica, C. glabra, C. forbesii, and C. macnabiana) have smaller cells than the species in more humid localities (C. macrocarpa and C. pygmaea). Minor, in some cases questionably significant, differences in cell size are found at different sites for the same species. Noteworthy interspecific differences exist in the frequency of anticlinal (pseudotransverse) divisions involved in cambial cell multiplication. On the whole, these divisions take place at a faster rate in the species with small cells (C. arizonica, C. macnabiana) than in species with large cells (C. pygmaea). Some general relationships between rate of growth, frequency of pseudotransverse divisions, and cell length are also evident. In the stems of mature trees, maximum cell length is apparently associated with a ring width of approximately 1–1.5 mm. Reduction in ring width is accompanied by a rise in frequency of pseudotransverse division and a slight recession in cell length. Widening of the rings produces no change in the rate of anticlinal division, in relation to linear radial accretion, but cell length declines. The orientation of the partition in pseudotransverse division is usually unidirectional in neighboring cells, but reversals in tilt occur after varied intervals. Duration of the interval between reversals shows an inverse relationship with the frequency of pseudotransverse division.

TRACHEID SIZE AND ANTICLINAL DIVISIONS IN THE CAMBIUM OF PSEUDOTSUGA

1964 ◽  
Vol 42 (5) ◽  
pp. 603-631 ◽  
Author(s):  
M. W. Bannan
Keyword(s):  
British Columbia ◽  
Ring Width ◽  
Cell Length ◽  
Mean Values ◽  
Second Growth ◽  
Anticlinal Division ◽  
Maximum Cell ◽  
Division Cell ◽  
Old Trees ◽  
Mother Cells

This study is concerned with certain aspects of cambial behavior and tracheid size in Douglas-fir. Geographical origin of material was Colorado, Utah, Wyoming, Washington, and several localities in British Columbia from Golden to Vancouver Island. Tracheids were smallest in all dimensions in the Colorado collections and largest in wood from coastal British Columbia. In second growth trees 35–70 years old and 10–20 in. in diameter maximum cell length was associated with a ring width of approximately 1 mm, the length declining in both wider and narrower rings. Increase in girth was accompanied by pseudotransverse divisions, these occurring mostly in fusiform cells functioning as initials, and only rarely in derived xylem mother cells. At breast height the frequency of pseudotransverse division centered about a rate of 1.3 divisions per centimeter of xylem increment when rings were 2–7 mm wide. Reduction in ring width below 1 mm occasioned a rise in frequency of anticlinal division with consequent cell shortening. In the recent growth of old trees 475–675 years old and 3–7 ft in diameter similar relationships prevailed between frequency of anticlinal division, cell length, and ring width, but mean values for rate of division and cell length differed slightly from those for young trees. Upward in the bole, to a height of 50 ft, anticlinal divisions decreased in frequency and cell length increased, but the amount of cell lengthening was greater than could be accounted for by the change in rate of division. Notable differences in rate of division occurred between neighboring trees on most sites. Although pseudotransverse divisions took place at various times during the growing season, most were aestival. Length of the partition in pseudotransverse division, although fluctuating from cell to cell, was, in general, directly related to length of the cambial cell undergoing division. The orientation of the partition in anticlinal division was usually unidirectional in neighboring cells, but occasionally an indeterminate condition prevailed. When unidirectional, reversals in direction of tilt occurred after varied intervals. Duration of the latter tended to be inversely related to the frequency of pseudotransverse division.

Variations in cell length and frequency of anticlinal division in the vascular cambium throughout a white spruce tree

1970 ◽  
Vol 48 (7) ◽  
pp. 1363-1371 ◽  
Author(s):  
M. W. Bannan ◽  
M. Bindra
Keyword(s):  
Negative Relationship ◽  
Ring Width ◽  
Early Growth ◽  
Cell Length ◽  
Stem Length ◽  
Cell Multiplication ◽  
Great Length ◽  
Vascular Elements ◽  
Anticlinal Division ◽  
Late Growth

In the early growth of the stem, branches, and roots, the vascular elements are relatively short and the frequency of anticlinal division involved in cambial cell multiplication is high. As growth sheaths are added in the stem, length of cell increases and rate of multiplicative division declines. A similar trend occurs upward through the lower quarter to half the height of the stem. In the root system, the later growth of vertical roots is characterized by shortness of cell and high frequency of anticlinal division, and conversely, that of horizontal roots by great length of cell and low rate of anticlinal division. Although a general negative relationship exists between rate of anticlinal division and cell length throughout much of the tree, these features sometimes vary independently, and length of cell seems to be more closely related to amount of yearly radial accretion. Through the middle to late growth of the stem a negative relationship obtains between length of cell and width of annual ring, cell length maximating at a ring width of 1–2 mm. At this stage, frequency of division may fluctuate only narrowly over a considerable range of ring width. A continued decline in ring width to less than 0.5 mm, such as may occur on senescence, is accompanied by decreased cell length and accelerated anticlinal division. Length of the cell plate in anticlinal division, relative to that of the dividing cell, is greater in the early growth of the stem and branches and throughout horizontal roots than elsewhere in the tree. Most of the anticlinal divisions are pseudotransverse. The proportion of lateral divisions ranges from about 1% in the late growth of stems to 11% in horizontal roots.

Wood density of western hemlock: effect of ring width

1994 ◽  
Vol 24 (3) ◽  
pp. 638-641 ◽  
Author(s):  
Jeffrey D. DeBell ◽  
John C. Tappeiner II ◽  
Robert L. Krahmer
Keyword(s):  
Growth Rate ◽  
Wood Density ◽  
Growth Rates ◽  
Ring Width ◽  
Western Hemlock ◽  
X Ray ◽  
Breast Height ◽  
Latewood Density ◽  
Earlywood Width ◽  
Average Wood

Wood density of western hemlock (Tsugaheterophylla (Raf.) Sarg.) was determined by X-ray densitometry of strips from breast-height samples consisting of rings 20–24 from the pith. Ring parameters were averaged over the 5 years for each strip. Wood density was negatively correlated with radial growth rate. Average wood density dropped from 0.47 to 0.37 g/cm3 as average ring width increased from 2 to 8 mm. Wood density decreased at higher growth rates primarily because earlywood width increased while latewood width remained the same; as a result, percentage of latewood decreased. Earlywood density decreased slightly at higher growth rates, but latewood density was not significantly related to growth rate.

Pinus contorta (lodgepole pine).

2021 ◽  
Author(s):  
Ana Jose Cobar
Keyword(s):  
Growth Rate ◽  
North America ◽  
Rapid Growth ◽  
Pinus Contorta ◽  
Stand Development ◽  
Western North America ◽  
Fast Growing ◽  
Ecological Amplitude ◽  
Rapid Growth Rate ◽  
The Usa

Abstract P. contorta is a fast-growing, short-lived and fire-adapted two-needled pine species with a very wide ecological amplitude and tolerance. It is an important and valuable timber trees in western North America, with forests dominated by P. contorta covering some 6 million ha in the USA and 20 million ha in Canada (Burns and Honkala, 1990). Because of its rapid growth rate, small taper and thin bark, it produces a higher volume of wood than many of its associates of the same diameter and height. It is a low nutrient-demanding species and easy to regenerate and grow. A common problem of regenerating P. contorta is overstocking which may result in growth stagnation during early stand development on water-deficient, nutrient-poor sites.

THE RELATIONSHIP BETWEEN CELL LENGTH AND RING WIDTH AND CIRCUMFERENTIAL GROWTH RATE IN FIVE CANADIAN SPECIES

IAWA Journal ◽  
2000 ◽  
Vol 21 (3) ◽  
pp. 335-345 ◽  
Author(s):  
S. Fujiwara ◽  
K. C. Yang
Keyword(s):  
Growth Rate ◽  
Black Spruce ◽  
Negative Relationship ◽  
Ring Width ◽  
White Spruce ◽  
Jack Pine ◽  
Cell Length ◽  
Balsam Fir ◽  
Trembling Aspen ◽  
The Relationship

Variation in cell length and the relationship between cell length and ring width and circumferential growth rate were studied in jack pine (Pinus banksiana Lamb.), balsam fir (Abies balsamea Mill.), white spruce (Picea glauca Voss), black spruce (Picea mariana Britton, Sterns & Pogg.) and trembling aspen (Populus tremuloides Michx.) collected in the natural forest in Ontario, Canada. There was a negative relationship between cell length and ring width in jack pine, balsam fir and black spruce, and a positive relationship in trembling aspen. No relationship was found in white spruce. There was a negative relationship between tracheid length and circumferential growth rate in all conifers. In trembling aspen fibre length decreased in both higher and lower circumferential growth rate. Circumferential growth rate is a good index of the effect of tree growth on cell length.

CELL LENGTH AND RATE OF ANTICLINAL DIVISION IN THE CAMBIUM OF THE SEQUOIAS

1966 ◽  
Vol 44 (2) ◽  
pp. 209-218 ◽  
Author(s):  
M. W. Bannan
Keyword(s):  
Cell Elongation ◽  
Ring Width ◽  
Cell Length ◽  
Sequoia Sempervirens ◽  
High Rate ◽  
Cambial Cell ◽  
Anatomical Features ◽  
Anticlinal Division ◽  
Cambial Cells

This report deals with the frequency of anticlinal (multiplicative) divisions in fusiform cambial cells, cell length at the time of division, and ring width as determined mostly in Sequoia sempervirens. The general relationships between these anatomical features resembled those observed in other conifers, but the frequency of anticlinal division was relatively high and the cells were long. Accordingly, the rate of cambial cell lengthening in the repetitive cycle of anticlinal division and cell elongation was found to exceed that in other conifers. Upward in the lower part of the stem the rate of anticlinal division decreased and cell length increased. A comparatively high rate of anticlinal division was maintained in the peripheral growth of large boles in both species, but cell length was greater in S. sempervirens than in S. gigantea.

CAMBIAL BEHAVIOR WITH REFERENCE TO CELL LENGTH AND RING WIDTH IN PICEA

1963 ◽  
Vol 41 (6) ◽  
pp. 811-822 ◽  
Author(s):  
M. W. Bannan
Keyword(s):  
Ring Width ◽  
Cell Length ◽  
Slight Reduction ◽  
Optimum Level ◽  
Annual Rings ◽  
Seasonal Growth ◽  
Uniform Rate ◽  
Maximum Cell ◽  
Cambial Cells ◽  
Picea Species

This study deals with the relationships between length of wood cells, width of annual rings, and frequency of multiplicative (pseudotransverse) divisions in fusiform cambial cells of Picea. Species investigated were P. engelmanni, P. glauca, P. mariana, and P. sitchensis. Observations were based on the recent growth of trees 10–20 in. in diameter, and in the case of P. sitchensis included trees up to 7 ft in diameter. In general, maximum cell length was associated with a ring width of 1–2 mm. Cell length declined with increase in ring width, and also decreased slightly when ring width fell below the optimum level. The frequency of pseudotransverse divisions in the cambium remained at a more or less uniform rate in trees with rings 2–8 mm wide, but rose sharply as ring width dropped below 1 mm. The slight reduction in cell length in narrow rings was apparently associated with the rise in frequency of multiplicative divisions in the cambium. Maximum cell length was observed in P. sitchensis. The shortest cells and lowest frequency of multiplicative divisions were noted in P. engelmanni. As ring width decreased a higher proportion of the pseudotransverse divisions occurred during the late seasonal growth. The orientation of the partition in pseudotransverse division tended to be unidirectional, but reversals in direction of tilt occurred after varied intervals.

Revisiting the transition between juvenile and mature wood: a comparison of fibre length, microfibril angle and relative wood density in lodgepole pine

Holzforschung ◽  
2009 ◽  
Vol 63 (4) ◽  
Author(s):  
Shawn D. Mansfield ◽  
Roberta Parish ◽  
C. Mario Di Lucca ◽  
James Goudie ◽  
Kyu-Young Kang ◽  
...  
Keyword(s):  
Wood Density ◽  
Lodgepole Pine ◽  
Fibre Length ◽  
Microfibril Angle ◽  
Ring Width ◽  
Mature Wood ◽  
Radial Increment ◽  
Breast Height ◽  
Tracheid Length ◽  
Fibre Traits

AbstractIn an attempt to examine the dynamic inter-relationship among wood density and fibre traits [tracheid length and microfibril angle (MFA)] in lodgepole pine (Pinus contorta), 60 trees were sampled in three age classes from four sites in central British Columbia. Breast height discs were taken and relative wood density was measured along two radii. Tracheid length was assessed on isolated 5-year increments from pith to bark at breast height for each tree. MFA was determined every 50 μm and the 5-mm composite intervals from pith to bark per disc at breast height were used in the analysis. Segmented regression was employed to identify the “juvenile to mature wood” transition point, which revealed transition ages of 31, 18 and 15 for wood density, fibre length and MFA, respectively. These traits were related to primary growth, expressed as area increment, ring width, percent earlywood and height increment during the juvenile wood phase. Comparisons of wood and fibre traits showed a higher congruence between the time of transitions for fibre length and MFA (Pearson correlation coefficient 0.52) than that between fibre length and wood density (0.07), and MFA and wood density (0.16). The cessation of early rapid radial increment growth terminated before wood and fibre transitions to mature wood occurred. Fibre length was significantly, but not strongly, related to ring width and percent earlywood (0.35 for both). The duration of juvenile fibre production was not significantly related to height growth.

SEQUENTIAL CHANGES IN RATE OF ANTICLINAL DIVISION, CAMBIAL CELL LENGTH, AND RING WIDTH IN THE GROWTH OF CONIFEROUS TREES

1967 ◽  
Vol 45 (8) ◽  
pp. 1359-1369 ◽  
Author(s):  
M. W. Bannan
Keyword(s):  
Cell Size ◽  
Ring Width ◽  
Cell Length ◽  
Annual Increment ◽  
Cambial Cell ◽  
Cell Dimensions ◽  
Anticlinal Division ◽  
Cambial Cells ◽  
Uniform Ring ◽  
Tree Development

The early growth of a tree is marked by a widening of the annual increments, a deceleration in rate of multiplicative (anticlinal) division of fusiform cambial cells, and an increase in cell length. Distance outward from the pith at which maximation in cell size occurs, and subsequent trends in cell dimensions, are apparently modified by rate of growth. Continuation of a uniform ring width through the middle to late years favors comparative constancy in rate of anticlinal division and cell size during that stage of tree development. Reduction in amount of annual increment in the late growth to the width optimal for cell extension, about 1 mm, induces a delayed and probably heightened maximation in cell length. Continued lessening in radial growth to an annual accretion of 0.5 mm or less, with the onset of senility, results in acceleration in rate of multiplicative division and reduction in cell length.

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