Short- and long-term responses to seasonal drought in ponderosa pines growing at different plantation densities in Patagonia, South America
Trees drought responses could be developed in the short- or in the long-term, aiming at sustaining carbon fixation and water use efficiency (WUE). The objective of this study was to examine short- and long-term adjustments occurring in different size Pinus ponderosa Dougl. ex P. & C. Laws trees in r...
| Autores principales: | , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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2017
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| Acceso en línea: | http://hdl.handle.net/20.500.12123/1543 https://link.springer.com/article/10.1007/s00468-012-0759-7 https://doi.org/10.1007/s00468-012-0759-7 |
| _version_ | 1855482903965728768 |
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| author | Gyenge, Javier Fernandez, María Elena Varela, Santiago Agustin |
| author_browse | Fernandez, María Elena Gyenge, Javier Varela, Santiago Agustin |
| author_facet | Gyenge, Javier Fernandez, María Elena Varela, Santiago Agustin |
| author_sort | Gyenge, Javier |
| collection | INTA Digital |
| description | Trees drought responses could be developed in the short- or in the long-term, aiming at sustaining carbon fixation and water use efficiency (WUE). The objective of this study was to examine short- and long-term adjustments occurring in different size Pinus ponderosa Dougl. ex P. & C. Laws trees in response to seasonal drought when they are growing under different competition level. The following variables were studied: branch and stem hydraulic conductivity, canopy and stomatal conductance (gc, gs), transpiration (E), photosynthesis (Amax), wood δ13C (as a proxy of intrinsic WUE), leaf to sapwood area ratio (AL:As) and growth in the biggest (B) and the smallest (S) trees of high (H) and low (L) density stands. AL:As was positively correlated with tree size and negatively correlated with competition level, increasing leaf hydraulic conductance in H trees. Accordingly, higher gc and E per unit AL were found in H than in L trees when soil water availability was high, but decreased abruptly during dry periods. BL trees maintained stable gc and E values even during the summer drought. The functional adjustments observed in H trees allow them to maintain their hydraulic integrity (no apparent ks losses), but their stem and leaf growth were severely affected by drought events. iWUE was similar between all tree groups in a wet season, whereas it significantly decreased in SH trees in a dry season suggesting that when radiation and water are co-limiting gas exchange, functional adjustments not only affect absolute growth, but also WUE. |
| format | Artículo |
| id | INTA1543 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| record_format | dspace |
| spelling | INTA15432018-01-09T12:51:12Z Short- and long-term responses to seasonal drought in ponderosa pines growing at different plantation densities in Patagonia, South America Gyenge, Javier Fernandez, María Elena Varela, Santiago Agustin Pinus Ponderosa Arboles Forestales Sequía Forest Trees Drought Hydraulic Conductivity Water Use Efficiency Intraspecific Competition Conductividad Hidráulica Eficacia en el Uso del Agua Competencia Intraespecífica Región Patagónica Trees drought responses could be developed in the short- or in the long-term, aiming at sustaining carbon fixation and water use efficiency (WUE). The objective of this study was to examine short- and long-term adjustments occurring in different size Pinus ponderosa Dougl. ex P. & C. Laws trees in response to seasonal drought when they are growing under different competition level. The following variables were studied: branch and stem hydraulic conductivity, canopy and stomatal conductance (gc, gs), transpiration (E), photosynthesis (Amax), wood δ13C (as a proxy of intrinsic WUE), leaf to sapwood area ratio (AL:As) and growth in the biggest (B) and the smallest (S) trees of high (H) and low (L) density stands. AL:As was positively correlated with tree size and negatively correlated with competition level, increasing leaf hydraulic conductance in H trees. Accordingly, higher gc and E per unit AL were found in H than in L trees when soil water availability was high, but decreased abruptly during dry periods. BL trees maintained stable gc and E values even during the summer drought. The functional adjustments observed in H trees allow them to maintain their hydraulic integrity (no apparent ks losses), but their stem and leaf growth were severely affected by drought events. iWUE was similar between all tree groups in a wet season, whereas it significantly decreased in SH trees in a dry season suggesting that when radiation and water are co-limiting gas exchange, functional adjustments not only affect absolute growth, but also WUE. Fil: Gyenge, Javier Enrique. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Fernandez, María Elena. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Varela, Santiago Agustin. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina 2017-10-20T12:02:05Z 2017-10-20T12:02:05Z 2012-12 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion http://hdl.handle.net/20.500.12123/1543 https://link.springer.com/article/10.1007/s00468-012-0759-7 0931-1890 (Print) 1432-2285 (Online) https://doi.org/10.1007/s00468-012-0759-7 eng info:eu-repo/semantics/restrictedAccess application/pdf Trees : structure and function 26 (6) : 1905–1917 (December 2012) |
| spellingShingle | Pinus Ponderosa Arboles Forestales Sequía Forest Trees Drought Hydraulic Conductivity Water Use Efficiency Intraspecific Competition Conductividad Hidráulica Eficacia en el Uso del Agua Competencia Intraespecífica Región Patagónica Gyenge, Javier Fernandez, María Elena Varela, Santiago Agustin Short- and long-term responses to seasonal drought in ponderosa pines growing at different plantation densities in Patagonia, South America |
| title | Short- and long-term responses to seasonal drought in ponderosa pines growing at different plantation densities in Patagonia, South America |
| title_full | Short- and long-term responses to seasonal drought in ponderosa pines growing at different plantation densities in Patagonia, South America |
| title_fullStr | Short- and long-term responses to seasonal drought in ponderosa pines growing at different plantation densities in Patagonia, South America |
| title_full_unstemmed | Short- and long-term responses to seasonal drought in ponderosa pines growing at different plantation densities in Patagonia, South America |
| title_short | Short- and long-term responses to seasonal drought in ponderosa pines growing at different plantation densities in Patagonia, South America |
| title_sort | short and long term responses to seasonal drought in ponderosa pines growing at different plantation densities in patagonia south america |
| topic | Pinus Ponderosa Arboles Forestales Sequía Forest Trees Drought Hydraulic Conductivity Water Use Efficiency Intraspecific Competition Conductividad Hidráulica Eficacia en el Uso del Agua Competencia Intraespecífica Región Patagónica |
| url | http://hdl.handle.net/20.500.12123/1543 https://link.springer.com/article/10.1007/s00468-012-0759-7 https://doi.org/10.1007/s00468-012-0759-7 |
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