Analysis of growth and light interception of balsam fir and white birch saplings following precommercial thinning

Pothier, David; Margolis, A

doi:10.1051/forest:19910201

Cited by 51 publications

(23 citation statements)

References 14 publications

(17 reference statements)

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“…-firstly, the increase in light in the lower parts of the crown which favours photosynthesis throughout the crown [43,85,102]. It is also well known that photosynthesis in closed cover [109] is at a maximum in the narrow zone situated between the leaves in full light and those in the shade.…”

Section: Influence On Tree Growthmentioning

confidence: 99%

Interactions between forest stands and microclimate: Ecophysiological aspects and consequences for silviculture

2000

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-At a local scale, forest trees and stands have a marked influence on climate; thus it is possible to define microclimates. These effects depend on local climatic characteristics and stand type. All climatic parameters should be considered, but particular attention should be paid to temperature, light and water. From a silvicultural point of view knowledge of the interactions existing between microclimatic conditions and stands, in conjunction with information now available concerning tree ecophysiology make it possible to produce viable applications which are useful for silviculture during stand formation, and for applying silvicultural treatments. Whitout a doubt, taking forest cover interactions into account (climate and ecophysiological potential of species) is the basis of sustainable management in forests. Based on the current knowledge about young stands, it is possible to use existing vegetation cover, in a more or less modified form, to improve temperature conditions especially in relation to spring frost damage, and to improve water conditions for both plant uptake and plant growth for a variable period depending on the species, but for a minimum of 4 to 5 years. For clearing and thinning, the effects of microclimatic changes created by this type of forestry management, and consequently the response of trees in terms of photosynthesis and growth, are now well defined.forest stands / microclimate / ecophysiology / silviculture Résumé -Interactions entre peuplements forestiers et microclimat : aspect écophysiologique et conséquences pour la sylviculture. Les arbres et les peuplements forestiers exercent, au niveau local, des influences notables sur le climat ; on peut alors définir des microclimats. Ces influences sont dépendantes des caractéristiques du climat local et des types de peuplement. L'ensemble des paramètres climatiques sont à considérer, mais une attention particulière doit être portée à la température, à la lumière et à l'eau. Au plan sylvicole la connaissance des interactions existant entre conditions microclimatiques et peuplements, couplées aux informations maintenant disponibles concernant l'écophysiologie des arbres permettent de déboucher sur des applications fiables, utilisables par la sylviculture pour la création des peuplements et la mise en oeuvre des traitements sylvicoles. Incontestablement la prise en compte des interactions couvert forestier -climat et potentialités écophysiologiques des essences est à la base d'une gestion durable des forêts. Sur la base des connaissances actuelles et pour ce qui concerne les jeunes peuplements, il est possible d'utiliser le couvert végétal préexistant, plus ou moins modifié, pour améliorer les conditions thermiques notamment au plan des risques de dégâts de gel au printemps et pour améliorer les conditions hydriques tant pour ce qui concerne la reprise que la croissance des plants pendant une période variable selon les espèces, mais d'une durée minimale de 4 à 5 ans. Pour les dégagements et éclaircies l'effet des modifications micr...

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Section: Influence On Tree Growthmentioning

confidence: 99%

Interactions between forest stands and microclimate: Ecophysiological aspects and consequences for silviculture

2000

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“…Mean RUE values were 1.5 for poplar in Pennsylvania and Wisconsin, USA 14 and balsam ®r (Abies balsamea (L.) Mill) 25 . RUE was 1.65 for loblolly pine (Pinus taeda L.) 26 , 1.3± 1.7 for Monterey pine (Pinus radiata) 20,27 , 1.8 for white birch (Betula papyrifera Marsh) 25 , and 1.9 for Sitka spruce 19 . For eucalyptus, Linder 20 reported a low value of 0.9 while Landsberg and Hingston 28 found a value of 2.2 in the absence of drought stress.…”

Section: Introductionmentioning

confidence: 99%

Biomass accumulation and radiation use efficiency of honey mesquite and eastern red cedar

Kiniry

1998

Biomass and Bioenergy

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AbstractÐRangeland models that simulate hydrology, soil erosion and nutrient balance can be used to select management systems which maximize pro®ts for producers while they minimize adverse impacts on water quality. Values are needed for parameters that describe the growth of invading woody species in order to allow simulation of their competition with grasses. Three attributes useful for describing and quantifying plant growth are: the potential leaf area index (LAI) or ratio of leaf area divided by ground area; the light extinction coe cient (k) that is used to calculate the fraction of light intercepted by leaves, applying Beer's law; and the radiation-use e ciency (RUE) or amount of dry biomass produced per unit of intercepted light. Objectives in this study were to measure LAI, k, and RUE for eastern red cedar (Juniperus virginiana L.) and honey mesquite (Prosopis glandulosa Torr. var. glandulosa), without competing plants, as a ®rst step toward simulating their growth. Seedlings were planted in the ®eld at Temple, Texas, USA in early 1992 and kept free of competition from herbaceous plants. During 1993During , 1994 and 1995 data were collected on biomass, leaf area and intercepted photosynthetically active radiation (PAR) for individual trees. Both tree species showed exponential biomass increases. At the end of the 1995 growing season, mean LAI values were 1.16 for cedar and 1.25 for mesquite. Mean k values were 0.34 for mesquite and 0.37 for cedar. Radiation use e ciency for aboveground biomass was 1.6020.17 (mean2standard deviation) g per MJ of intercepted PAR for cedar and 1.6120.26 for mesquite. The rapid growth in 1995 was accompanied by greater leaf area and thus greater summed intercepted PAR. These values are critical for quantifying growth of these two species. #

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“…For Scots pine, a ratio of 0.129 (m 2 /cm 2 ) from southern Finland was used [13]. Leaf areas of all broadleaf species were calculated using a ratio of 0.183 (m 2 /cm 2 ) developed for Betula papyrifera (Marsh) in eastern Canada (as the average of the four values reported by Pothier and Margolis [26].…”

Section: Introductionmentioning

confidence: 99%

Leaf area and tree increment dynamics on a fertile mixed-conifer site in southern Finland

O’Hara¹,

Lähde²,

Laiho³

et al. 1999

Ann. For. Sci.

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Analysis of growth and light interception of balsam fir and white birch saplings following precommercial thinning

Cited by 51 publications

References 14 publications

Interactions between forest stands and microclimate: Ecophysiological aspects and consequences for silviculture

Interactions between forest stands and microclimate: Ecophysiological aspects and consequences for silviculture

Biomass accumulation and radiation use efficiency of honey mesquite and eastern red cedar

Leaf area and tree increment dynamics on a fertile mixed-conifer site in southern Finland

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