Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees
Water availability is a principal factor limiting the distribution of closed-canopy forest in the seasonal tropics, suggesting that forest tree species may not be well adapted to cope with seasonal drought. We studied 11 congeneric species pairs, each containing one forest and one savanna species, t...
Guardado en:
| Autores principales: | , , , , , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00298549_v163_n2_p291_Gotsch |
| Aporte de: |
| id |
todo:paper_00298549_v163_n2_p291_Gotsch |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_00298549_v163_n2_p291_Gotsch2023-10-03T14:39:40Z Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees Gotsch, S.G. Geiger, E.L. Franco, A.C. Goldstein, G. Meinzer, F.C. Hoffmann, W.A. Brazil Cerrado Huber value Leaf area index Sap flow adaptation biomass allocation cerrado drought dry season forest canopy homeostasis hydraulic conductivity hypothesis testing leaf area index sap flow savanna stomatal conductance water availability water relations Brazil Water availability is a principal factor limiting the distribution of closed-canopy forest in the seasonal tropics, suggesting that forest tree species may not be well adapted to cope with seasonal drought. We studied 11 congeneric species pairs, each containing one forest and one savanna species, to test the hypothesis that forest trees have a lower capacity to maintain seasonal homeostasis in water relations relative to savanna species. To quantify this, we measured sap flow, leaf water potential (Ψ L ), stomatal conductance (g s ), wood density, and Huber value (sapwood area:leaf area) of the 22 study species. We found significant differences in the water relations of these two species types. Leaf area specific hydraulic conductance of the soil/root/leaf pathway (G t ) was greater for savanna species than forest species. The lower G t of forest trees resulted in significantly lower Ψ L and g s in the late dry season relative to savanna trees. The differences in G t can be explained by differences in biomass allocation of savanna and forest trees. Savanna species had higher Huber values relative to forest species, conferring greater transport capacity on a leaf area basis. Forest trees have a lower capacity to maintain homeostasis in Ψ L due to greater allocation to leaf area relative to savanna species. Despite significant differences in water relations, relationships between traits such as wood density and minimum Ψ L were indistinguishable for the two species groups, indicating that forest and savanna share a common axis of water-use strategies involving multiple traits. © 2010 Springer-Verlag. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00298549_v163_n2_p291_Gotsch |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Brazil Cerrado Huber value Leaf area index Sap flow adaptation biomass allocation cerrado drought dry season forest canopy homeostasis hydraulic conductivity hypothesis testing leaf area index sap flow savanna stomatal conductance water availability water relations Brazil |
| spellingShingle |
Brazil Cerrado Huber value Leaf area index Sap flow adaptation biomass allocation cerrado drought dry season forest canopy homeostasis hydraulic conductivity hypothesis testing leaf area index sap flow savanna stomatal conductance water availability water relations Brazil Gotsch, S.G. Geiger, E.L. Franco, A.C. Goldstein, G. Meinzer, F.C. Hoffmann, W.A. Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees |
| topic_facet |
Brazil Cerrado Huber value Leaf area index Sap flow adaptation biomass allocation cerrado drought dry season forest canopy homeostasis hydraulic conductivity hypothesis testing leaf area index sap flow savanna stomatal conductance water availability water relations Brazil |
| description |
Water availability is a principal factor limiting the distribution of closed-canopy forest in the seasonal tropics, suggesting that forest tree species may not be well adapted to cope with seasonal drought. We studied 11 congeneric species pairs, each containing one forest and one savanna species, to test the hypothesis that forest trees have a lower capacity to maintain seasonal homeostasis in water relations relative to savanna species. To quantify this, we measured sap flow, leaf water potential (Ψ L ), stomatal conductance (g s ), wood density, and Huber value (sapwood area:leaf area) of the 22 study species. We found significant differences in the water relations of these two species types. Leaf area specific hydraulic conductance of the soil/root/leaf pathway (G t ) was greater for savanna species than forest species. The lower G t of forest trees resulted in significantly lower Ψ L and g s in the late dry season relative to savanna trees. The differences in G t can be explained by differences in biomass allocation of savanna and forest trees. Savanna species had higher Huber values relative to forest species, conferring greater transport capacity on a leaf area basis. Forest trees have a lower capacity to maintain homeostasis in Ψ L due to greater allocation to leaf area relative to savanna species. Despite significant differences in water relations, relationships between traits such as wood density and minimum Ψ L were indistinguishable for the two species groups, indicating that forest and savanna share a common axis of water-use strategies involving multiple traits. © 2010 Springer-Verlag. |
| format |
JOUR |
| author |
Gotsch, S.G. Geiger, E.L. Franco, A.C. Goldstein, G. Meinzer, F.C. Hoffmann, W.A. |
| author_facet |
Gotsch, S.G. Geiger, E.L. Franco, A.C. Goldstein, G. Meinzer, F.C. Hoffmann, W.A. |
| author_sort |
Gotsch, S.G. |
| title |
Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees |
| title_short |
Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees |
| title_full |
Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees |
| title_fullStr |
Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees |
| title_full_unstemmed |
Allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees |
| title_sort |
allocation to leaf area and sapwood area affects water relations of co-occurring savanna and forest trees |
| url |
http://hdl.handle.net/20.500.12110/paper_00298549_v163_n2_p291_Gotsch |
| work_keys_str_mv |
AT gotschsg allocationtoleafareaandsapwoodareaaffectswaterrelationsofcooccurringsavannaandforesttrees AT geigerel allocationtoleafareaandsapwoodareaaffectswaterrelationsofcooccurringsavannaandforesttrees AT francoac allocationtoleafareaandsapwoodareaaffectswaterrelationsofcooccurringsavannaandforesttrees AT goldsteing allocationtoleafareaandsapwoodareaaffectswaterrelationsofcooccurringsavannaandforesttrees AT meinzerfc allocationtoleafareaandsapwoodareaaffectswaterrelationsofcooccurringsavannaandforesttrees AT hoffmannwa allocationtoleafareaandsapwoodareaaffectswaterrelationsofcooccurringsavannaandforesttrees |
| _version_ |
1782029881562890240 |