Life strategies in intra-annual dynamics of wood formation: example of three conifer species in a temperate forest in north-east France

H. E. Cuny; C. B. K. Rathgeber; F. Lebourgeois; M. Fortin; M. Fournier

doi:10.1093/treephys/tps039

Nurse-plant and mulching effects on three conifer species in a Mexican temperate forest

Ecological Engineering ◽

10.1016/j.ecoleng.2011.01.012 ◽

2011 ◽

Vol 37 (6) ◽

pp. 994-998 ◽

Cited By ~ 21

Author(s):

Arnulfo Blanco-García ◽

Cuauhtémoc Sáenz-Romero ◽

Carlos Martorell ◽

Pedro Alvarado-Sosa ◽

Roberto Lindig-Cisneros

Keyword(s):

Temperate Forest ◽

Nurse Plant ◽

Conifer Species

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Cutting time slices of tree rings —How intra-annual dynamics of wood formation help to decipher space for time conversion in tree-ring sciences

10.5194/egusphere-egu2020-22286 ◽

2020 ◽

Author(s):

Gonzalo Peres-De-Lis ◽

Cyrille Rathgeber ◽

Stéphane Ponton

Keyword(s):

Cell Differentiation ◽

Tree Ring ◽

Isotope Composition ◽

Growing Season ◽

Wood Formation ◽

Tree Level ◽

Wall Thickening ◽

North East ◽

Common Signal ◽

Kinetics Of

<p>Despite a long-standing interest in retrieving intra-annual environmental information from tree-ring features, none of the approaches developed so far for accurately dating intra-ring sector has been validated on observations. Here, we investigated space-for-time association across regular intra-ring sectors for which we estimated the timing of formation. For this purpose, a unique dataset containing quantitative wood anatomy measurements and kinetics of tracheid differentiation was compiled for 45 trees grown in North-East France (three years of wood formation monitoring, for five trees, from three different conifer species). Tracheid dimensions were measured directly on the best anatomical sections at the end of the growing season, while the kinetics of xylem cell differentiation were provided at tree-level by an empirical model of wood formation dynamics. Our results confirmed that the time taken to form sectors of the same width increased from earlywood (composed of wide thin-walled tracheids) to latewood (composed of narrow thick-walled tracheids). This mainly reflected the increase of the duration of cell wall deposition through the growing season, and, to a lesser extent, the augmentation of the number of tracheids per sectors. However, our results also show that regular intra-ring sectors, which were well separated in space, overlapped in time. The overlapping culminated during the summer period, reaching 40&#160;% for 10 sectors. It could be reduced to approx. 30&#160;% by increasing the number of sectors (from 10 to 25, for example), but it cannot be removed. Therefore, successive intra-ring sectors could not be attributed to a succession of separated time intervals by simply using their relative position along the ring. However, the formation of sectors of equivalent ranks were noticeably synchronous between the different trees and years, reaching 80&#160;% of synchronicity for the process of wall thickening. This suggest that data from regular intra-ring sectors could be reliably used to build mean chronologies expressing the common signal of tree populations. Our results show the limits that the xylogenesis process itself imposes on the dating of intra-ring features. They also argue for an in-depth understanding of the association between cell differentiation processes (enlargement, wall thickening and lignification) and wood characteristics (density, anatomy, stable isotope composition).</p>

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Variation in the incidence and severity of drought crack in three conifer species in North East Scotland

Scandinavian Journal of Forest Research ◽

10.1080/02827581.2017.1360936 ◽

2017 ◽

Vol 32 (8) ◽

pp. 658-662 ◽

Cited By ~ 3

Author(s):

Andrew Cameron ◽

Duncan Orr ◽

James Clark

Keyword(s):

Conifer Species ◽

North East

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Relationship between Vessel Formation and Seasonal Changes in Leaf Area of Evergreen and Deciduous Species with Different Vessel Arrangements

Plants ◽

10.3390/plants10010100 ◽

2021 ◽

Vol 10 (1) ◽

pp. 100

Author(s):

Sayaka Takahashi ◽

Erina Takahashi

Keyword(s):

Leaf Area ◽

Tree Species ◽

Temperate Forest ◽

Leaf Expansion ◽

Life Strategies ◽

Thin Sections ◽

Vessel Formation ◽

Almost All ◽

Leaf Appearance ◽

Diffuse Porous

To discuss the diversity of morphological traits and life strategies of trees, the functional relationship between leaf expansion and vessel formation must be clarified. We compared the temporal relationship among tree species with different leaf habits and vessel arrangements. Twigs, leaves, and trunk core samples were periodically acquired from 35 sample trees of nine species in a temperate forest in Japan. We quantitatively estimated leaf expansion using a nonlinear regression model and observed thin sections of twigs and trunks with a light microscope. Almost all of the first-formed vessels in twigs, which formed adjacent to the annual ring border, were lignified with a leaf area between 0% and 70% of the maximum in all species. The first-formed vessels in trunks lignified between 0% and 95% of the maximum leaf area in ring-porous deciduous Quercus serrata and ring-(radial-)porous evergreen Castanopsis cuspidate. Their lignification occurred earlier than in diffuse-porous deciduous Liquidambar styraciflua, diffuse-porous evergreen Cinnamomum camphora and Symplocos prunifolia, and radial-porous evergreen Quercus glauca and Quercus myrsinifolia. The timing varied in semi-ring-porous deciduous Acanthopanax sciadophylloides and diffuse-porous evergreen Ilex pedunculosa. The observed differences in the timing of vessel formation after leaf appearance were reflected in their differing vessel porosities and were connected to the different life strategies among tree species.

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Ras al Khaimah: further archaeological discoveries

Antiquity ◽

10.1017/s0003598x00150070 ◽

1976 ◽

Vol 50 (200) ◽

pp. 216-222

Author(s):

Beatrice De Cardi

Keyword(s):

United Arab Emirates ◽

The State ◽

Focused Attention ◽

North East ◽

The North ◽

History Of ◽

The City

Ras a1 Khaimah is the most northerly of the seven states comprising the United Arab Emirates and its Ruler, H. H. Sheikh Saqr bin Mohammad al-Qasimi, is keenly interested in the history of the state and its people. Survey carried out there jointly with Dr D. B. Doe in 1968 had focused attention on the site of JuIfar which lies just north of the present town of Ras a1 Khaimah (de Cardi, 1971, 230-2). Julfar was in existence in Abbasid times and its importance as an entrep6t during the sixteenth and seventeenth centuries-the Portuguese Period-is reflected by the quantity and variety of imported wares to be found among the ruins of the city. Most of the sites discovered during the survey dated from that period but a group of cairns near Ghalilah and some long gabled graves in the Shimal area to the north-east of the date-groves behind Ras a1 Khaimah (map, FIG. I) clearly represented a more distant past.

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