Hydraulic properties of naturally regenerated beech saplings respond to canopy opening

被引:19
作者
Caquet, Blandine [1 ,2 ,3 ,4 ]
Barigah, Tete S. [5 ]
Cochard, Herve [5 ,6 ]
Montpied, Pierre [1 ,2 ,6 ]
Collet, Catherine [3 ,4 ]
Dreyer, Erwin [1 ,2 ]
Epron, Daniel [1 ,2 ]
机构
[1] INRA, UMR Ecol & Ecophysiol Forestieres 1137, F-54280 Champenoux, France
[2] Univ Henri Poincare, Nancy Univ, UMR Ecol & Ecophysiol Forestieres 1137, F-54506 Vandoeuvre Les Nancy, France
[3] INRA, Lab Etud Ressources Foret Bois, UMR 1092, F-54280 Champenoux, France
[4] AgroParisTech, Lab Etud Ressources Foret Bois, UMR 1092, F-54000 Nancy, France
[5] INRA, UMR Physiol Integree Arbre Fruitier & Forestier 5, F-63039 Clermont Ferrand, France
[6] Blaise Pascal Univ, UMR Physiol Integree Arbre Fruitier & Forestier 5, F-63177 Clermont Ferrand, France
关键词
acclimation; biomass allocation; gap; hydraulic conductance; vulnerability to cavitation; SYLVATICA L. SEEDLINGS; PHOTOSYNTHETIC ACCLIMATION; XYLEM VULNERABILITY; LIGHT CONDITIONS; SUDDEN INCREASE; WATER RELATIONS; ACER-SACCHARUM; QUERCUS-RUBRA; GROWTH; ARCHITECTURE;
D O I
10.1093/treephys/tpp067
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Enhanced sapling growth in advance regeneration requires gaps in the canopy, but is often delayed after canopy opening, because acclimation of saplings to the new environment is gradual and may last for several years. Canopy opening is expected to result in an increased transpiration because of a larger climatic demand and a higher stomatal conductance linked to the higher rates of photosynthesis. Therefore, we focused on the changes in water relations and the hydraulic properties of beech (Fagus sylvatica L.) saplings during 2 years after canopy opening. We tested the hypothesis that an increase in leaf-specific hydraulic conductance and a decrease in vulnerability to cavitation occur to sustain an enhanced transpiration. Hydraulic conductance of defoliated shoots, vulnerability to cavitation, size and density of xylem vessels as well as stomatal conductance were recorded on saplings growing in shade (S saplings) or in gaps created by opening the canopy (shade-to-light, SL saplings). Hydraulic conductance per unit cross-sectional area (K-AS) did not differ in the shoots of S and SL saplings. But a higher ratio stem cross-sectional area/leaf area resulted in a higher leaf-specific hydraulic conductance of the shoots (K-AL) of SL saplings. Contrary to expectations, vulnerability to cavitation increased transitorily in stems during the first year after canopy opening and no difference was observed between the two treatments in light-saturated stomatal conductance. During the second year, vulnerability to cavitation was similar in the S and SL saplings and light-saturated stomatal conductance increased in SL saplings. These results demonstrate a release of the hydraulic constraints after canopy opening with an adjustment of the ratio stem cross-sectional area/leaf area. But the larger vulnerability to cavitation during the first year could limit stomatal opening and therefore the ability of beech saplings to use the available light for photosynthesis and could therefore partly explain why the growth increase was delayed to the second growing season after canopy opening.
引用
收藏
页码:1395 / 1405
页数:11
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