Interannual and spatial variation in maximum leaf area index of temperate deciduous stands
Identifieur interne : 000E99 ( Main/Exploration ); précédent : 000E98; suivant : 000F00Interannual and spatial variation in maximum leaf area index of temperate deciduous stands
Auteurs : Valérie Le Dantec [France] ; Eric Dufrêne [France] ; Bernard Saugier [France]Source :
- Forest Ecology and Management [ 0378-1127 ] ; 2000.
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Abstract
The aim of this study was to quantify, both spatial and temporal variations of maximum leaf area index (LAI) and to interpret LAI variation according to stand characteristics and meteorological conditions. We have compared maximum LAI, measured using the LI-COR LAI-2000 PCA, throughout 4 years and over 420ha of a temperate forest across a range of stand structure (density, biomass, age) and site fertility (soil nutrient and water availability). LAI values ranged from 0.5 to 8m2m−2. This study has shown that maximal LAI was relatively stable between years. However, although the water stress did not affect LAI development in the current year, it reduced LAI of the following year only in stands with high LAI (above 5.5m2m−2). Spatial variations of maximal LAI were mainly dependent on forest management which affected tree density and stand diameter at breast height (DBH) through thinning and harvesting. Among the 34 deciduous stands studied, maximal LAI increased with tree density up to a value of about 1000 stems per ha and then it reached a plateau between 6 and 8m2m−2. Total leaf area per tree has a strong correlation to DBH for species with different sap conducting system (r2=0.94). Decreases of maximal LAI with humus quality were observed, suggesting that, although forest management appears to be the main cause of LAI variations between stands and between years, soil fertility may be a determinant of stand LAI.
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DOI: 10.1016/S0378-1127(99)00246-7
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We have compared maximum LAI, measured using the LI-COR LAI-2000 PCA, throughout 4 years and over 420ha of a temperate forest across a range of stand structure (density, biomass, age) and site fertility (soil nutrient and water availability). LAI values ranged from 0.5 to 8m2m−2. This study has shown that maximal LAI was relatively stable between years. However, although the water stress did not affect LAI development in the current year, it reduced LAI of the following year only in stands with high LAI (above 5.5m2m−2). Spatial variations of maximal LAI were mainly dependent on forest management which affected tree density and stand diameter at breast height (DBH) through thinning and harvesting. Among the 34 deciduous stands studied, maximal LAI increased with tree density up to a value of about 1000 stems per ha and then it reached a plateau between 6 and 8m2m−2. Total leaf area per tree has a strong correlation to DBH for species with different sap conducting system (r2=0.94). Decreases of maximal LAI with humus quality were observed, suggesting that, although forest management appears to be the main cause of LAI variations between stands and between years, soil fertility may be a determinant of stand LAI.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Île-de-France</li></region><settlement><li>Orsay</li></settlement></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Le Dantec, Valerie" sort="Le Dantec, Valerie" uniqKey="Le Dantec V" first="Valérie" last="Le Dantec">Valérie Le Dantec</name></region><name sortKey="Dufrene, Eric" sort="Dufrene, Eric" uniqKey="Dufrene E" first="Eric" last="Dufrêne">Eric Dufrêne</name><name sortKey="Le Dantec, Valerie" sort="Le Dantec, Valerie" uniqKey="Le Dantec V" first="Valérie" last="Le Dantec">Valérie Le Dantec</name><name sortKey="Saugier, Bernard" sort="Saugier, Bernard" uniqKey="Saugier B" first="Bernard" last="Saugier">Bernard Saugier</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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