Rythmes de croissance et de régénération des racines des végétaux ligneux

Riedacker, Arthur

doi:10.1051/forest/19760301

Cited by 30 publications

(21 citation statements)

References 26 publications

(2 reference statements)

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“…The high negative influence of low temperature in January was also observed in north-eastern France by Becker et al [3]. Another explanation could be that roots will continue to grow at the end of the growing season if they have a sufficient supply of nutrients and water, until the soil temperatures become too low [42]. As a result, if it rains during this period the roots will grow and when the new growth cycle begins, the following year, the tree will have a much larger root structure and will therefore be in a position to grow more [45].…”

Section: Discussionmentioning

confidence: 61%

Climate-tree-growth relationships ofQuercus petraeaMill. stand in the Forest of Bercé (“Futaie des Clos”, Sarthe, France)

Lebourgeois¹,

2004

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-The past history of a 300-year-old Quercus petraea stand (the "Futaie des Clos", 8 ha) located 20 km from the town of Le Mans in the Forest of Bercé in the western part of France (Sarthe) was analysed by a dendroecological approach. According to the number of healthy trees alive (> 400), the stand age (> 300 years), and the dimensions of the trees (dia: 92 cm; height: 45.2 m), this plot constitutes one of the most remarkable oak grove in France. High competition pressure between trees appeared to be the most important factor to explain the high-quality timber (high straight stems without wood defaults, narrow regular rings). After an initial 90-year period of decrease, this stand shows a 1 mm·year -1 growth increment from the 1810s to the present. The growth increase of 40-50% occurring for over than 20 years can be interpreted as a response to the increase of harvesting intensity. The influence of climate was evaluated by comparing earlywood, latewood and total ring indices with monthly climatic data collected at Le Mans over the period . Extreme growth years coincided with wet or dry springs (May-June) (± 40% of rainfall in relation to normal conditions) often associated with warm or fresh July. The climatic models accounted for between 18 and 26% of the variability of ring widths, and suggested that earlywood formation depended mainly on previous autumn hydric balance and winter temperature whereas the growth of the latewood band was maximum in early spring (positive effect of May hydric balance). The ecophysiological interpretations of the climatic correlations are discussed. dendroclimatology / tree ring / radial growth / climate / response function / Quercus petraea / long term chronology / pointer years Résumé -Dendroclimatologie du chêne sessile (Quercus petraea Mill.) en forêt de Bercé ("Futais des Clos", Sarthe, France). Une étude dendroécologique a été entreprise afin d'analyser l'évolution de la croissance radiale d'un peuplement âgé de chêne sessile (Quercus petraea Mill.) (la Futaie des Clos) localisé dans la forêt de Bercé à 20 km du Mans (Sarthe -France). En raison du nombre d'arbres présents (plus de 400 sur les 8 ha), de leur âge (> 300 ans en 2001) et de leur dimension (diamètre et hauteur moyens : 92 cm et 45,2 m), ce peuplement constitue une des plus remarquables chênaie sessiliflore de France. La sylviculture peu intensive pratiquée dans le peuplement explique en grande partie la très grande qualité des arbres (tronc très droit sans défaut, cernes fins réguliers). Après une période de décroissance de 90 ans, la largeur moyenne des cernes est d'environ 1 mm par an depuis 1810. L'augmentation de croissance observée depuis une vingtaine d'années peut être interprétée comme l'expression de l'augmentation de l'intensité des éclaircies (diminution de la compétition entre les arbres). L'effet du climat a été analysé en comparant les variations du bois initial, du bois final et du cerne complet aux données climatiques du Mans sur la période 1921-2001. Les années de croissance extrêmes (a...

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Section: Discussionmentioning

confidence: 61%

Climate-tree-growth relationships ofQuercus petraeaMill. stand in the Forest of Bercé (“Futaie des Clos”, Sarthe, France)

Lebourgeois¹,

2004

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“…It happened essentially with plants of small size and early in the season, before bubreak was completed. In these species, after the winter break, root growth is concomitant to aerial development [16] and a high proportion of old root tissue may lead to a high elasticity of the root system. For oak plants, it occurred essentially to root systems grown in Terra-green, therefore substrate may have induced changes to root anatomy such as development of aerenchyma.…”

Section: Discussionmentioning

confidence: 99%

Hydraulic conductance of root and shoot measured with the transient and dynamic modes of the high-pressure flowmeter

Bogeat‐Triboulot

Martin²,

Chatelet³

et al. 2002

Ann. For. Sci.

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-The hydraulic conductance (k) of shoots and root systems was measured using the transient and the dynamic modes of the high pressure flowmeter (HPFM). Measurements were conducted on Quercus robur and Fagus sylvatica plants grown on different substrates (forest soil, sand, Terra-green and vermiculite) and harvested at different times of the year. The values of k obtained by the transient mode were compared to those obtained by the dynamic mode. A tight 1:1 correlation was observed for shoots and defoliated stems but several types of discrepancies appeared for root systems. The underestimation of k by the dynamic mode as compared to the transient mode could be explained by reverse osmosis at the endodermis. However the transient mode was not functional for some root systems. This problem occurred essentially in small plants harvested early in the year before budbreak had been completed. Nature and origins of problems are discussed.hydraulic conductance / high pressure flowmeter / transient mode / root / shoot Résumé -Mesure de la conductance hydraulique des parties aériennes et des systèmes racinaires avec les modes transitoire et dynamique du fluxmètre haute pression. La conductance hydraulique des parties aériennes et des systèmes racinaires a été mesurée avec le fluxmètre haute pression (HPFM) en mode transitoire et en mode dynamique. Les mesures ont été effectuées sur des plants de Quercus robur et de Fagus sylvatica ayant poussé sur différents substrats (sol forestier, sable, Terra-green, vermiculite) et récoltés à différentes périodes de l'année. Les valeurs de k obtenues par le mode transitoire ont été comparées à celles obtenues par le mode dynamique. Une bonne corrélation 1:1 a été observée pour les rameaux et les tiges défeuillées mais plusieurs types de divergence sont apparus pour les systèmes racinaires. La sous-estimation de k par le mode dynamique par rapport au mode transitoire peut être expliquée par l'osmose inverse. Cependant le mode transitoire n'était pas fonctionnel pour certains systèmes racinaires. Ce problème s'est produit essentiellement pour des petits plants récoltés tôt dans l'année, avant que le débourrement ne soit fini. La nature et l'origine des problè-mes sont discutées.conductance hydraulique / fluxmètre haute pression / racine / rameau / mode transitoire Ann. For. Sci. 59 (2002) [389][390][391][392][393][394][395][396] 389

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“…Under such situations, some species as oaks develop relatively small root systems -projected area of root systems is smaller compared to that of crowns - [25]. With limitations to the water supply after water management measures in the region we may expect gradual adaptation of root systems, i.e., increase of root length [28,30,41,43] but only after years; old age may limit adaptive capabilities of large trees [21,23], especially in heavy soils [48].…”

Section: Soil Water Supply In Woody Species With Different Root Systemsmentioning

confidence: 99%

Water balance of a Southern Moravian floodplain forest under natural and modified soil water regimes and its ecological consequences

Čermák

Prax

2001

Ann. For. Sci.

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Rythmes de croissance et de régénération des racines des végétaux ligneux

Cited by 30 publications

References 26 publications

Climate-tree-growth relationships ofQuercus petraeaMill. stand in the Forest of Bercé (“Futaie des Clos”, Sarthe, France)

Climate-tree-growth relationships ofQuercus petraeaMill. stand in the Forest of Bercé (“Futaie des Clos”, Sarthe, France)

Hydraulic conductance of root and shoot measured with the transient and dynamic modes of the high-pressure flowmeter

Water balance of a Southern Moravian floodplain forest under natural and modified soil water regimes and its ecological consequences

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