Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes
Daily net canopy photosynthesis (Pn) was predicted for cocksfoot (Dactylis glomerata L.) canopies grown under different light regimes by integration of a leaf photosynthesis model developed for the light-saturated photosynthetic rate (Pmax), photosynthetic efficiency (a) and the degree of curvature...
| Autores principales: | , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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Springer Nature
2025
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| Acceso en línea: | http://hdl.handle.net/20.500.12123/24097 https://link.springer.com/article/10.1007/s10457-005-3825-y https://doi.org/10.1007/s10457-005-3825-y |
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| author | Peri, Pablo Luis Moot, Derrick McNeil, David L. |
| author_browse | McNeil, David L. Moot, Derrick Peri, Pablo Luis |
| author_facet | Peri, Pablo Luis Moot, Derrick McNeil, David L. |
| author_sort | Peri, Pablo Luis |
| collection | INTA Digital |
| description | Daily net canopy photosynthesis (Pn) was predicted for cocksfoot (Dactylis glomerata L.) canopies grown under different light regimes by integration of a leaf photosynthesis model developed for the light-saturated photosynthetic rate (Pmax), photosynthetic efficiency (a) and the degree of curvature (h) of the leaf light– response curve. When shade was the only limiting factor, the maximum Pn (Pnmax) was predicted to decrease approximately linearly from 33.4 g CO2 mÿ2 dÿ1 to zero as photosynthetic photon flux density
(PPFD) fell from full sunlight (1800 lmol mÿ2 sÿ1 PPFD) to 10% of this in a fluctuating light regime. It was also predicted that at 50% transmissivity Pnmax was higher for a continuous light regime (10.4 g CO2 mÿ2 dÿ1) than for a fluctuating light regime with the same intensity (8.4 g CO2 mÿ2 dÿ1). The canopy photosynthesis model was then used to predict dry matter (DM) production for cocksfoot field grown pastures under a diverse range of temperature, herbage nitrogen content and water status conditions in fluctuating light regimes. This prediction required inclusion of leaf area index and leaf canopy angle from field measurements. The model explained about 85% of the variation in observed cocksfoot DM production for a range from 6 to 118 kg DM haÿ1 dÿ1. The proposed model improves understanding of pasture growth prediction through integration of relationships between shade limitations in fluctuating
light regimes and other environmental factors that affect the canopy photosynthetic rate of cocksfoot pastures in silvopastoral systems. |
| format | Artículo |
| id | INTA24097 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Springer Nature |
| publisherStr | Springer Nature |
| record_format | dspace |
| spelling | INTA240972025-10-07T16:36:38Z Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes Peri, Pablo Luis Moot, Derrick McNeil, David L. Pastures Photosynthesis Dry Matter Content Light Regimes Leaf Area Index Pastizales Dactylis glomerata Fotosíntesis Régimen de Luz Índice de Area Foliar Contenido de Materia Seca Fluctuating Light Regimes Leaf Canopy Angle Light Interception Regimenes Fluctuantes de Luz Ángulo del Dosel de las Hojas Interceptación de Luz Daily net canopy photosynthesis (Pn) was predicted for cocksfoot (Dactylis glomerata L.) canopies grown under different light regimes by integration of a leaf photosynthesis model developed for the light-saturated photosynthetic rate (Pmax), photosynthetic efficiency (a) and the degree of curvature (h) of the leaf light– response curve. When shade was the only limiting factor, the maximum Pn (Pnmax) was predicted to decrease approximately linearly from 33.4 g CO2 mÿ2 dÿ1 to zero as photosynthetic photon flux density (PPFD) fell from full sunlight (1800 lmol mÿ2 sÿ1 PPFD) to 10% of this in a fluctuating light regime. It was also predicted that at 50% transmissivity Pnmax was higher for a continuous light regime (10.4 g CO2 mÿ2 dÿ1) than for a fluctuating light regime with the same intensity (8.4 g CO2 mÿ2 dÿ1). The canopy photosynthesis model was then used to predict dry matter (DM) production for cocksfoot field grown pastures under a diverse range of temperature, herbage nitrogen content and water status conditions in fluctuating light regimes. This prediction required inclusion of leaf area index and leaf canopy angle from field measurements. The model explained about 85% of the variation in observed cocksfoot DM production for a range from 6 to 118 kg DM haÿ1 dÿ1. The proposed model improves understanding of pasture growth prediction through integration of relationships between shade limitations in fluctuating light regimes and other environmental factors that affect the canopy photosynthetic rate of cocksfoot pastures in silvopastoral systems. EEA Santa Cruz Fil: Peri, Pablo Luis. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santa Cruz; Argentina. Fil: Peri, Pablo Luis. Universidad Nacional de la Patagonia Austral; Argentina. Fil: Peri, Pablo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Moot, Derrick. Lincoln University. Faculty of Agriculture an Life Science; Nueva Zelanda Fil: McNeil, David L. Lincoln University. Faculty of Agriculture an Life Science; Nueva Zelanda 2025-10-07T16:28:37Z 2025-10-07T16:28:37Z 2006-07 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/24097 https://link.springer.com/article/10.1007/s10457-005-3825-y Peri P.L.; Moot D.J.; Mcneil D.L. (2006) Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes. Agroforestry Systems 67: 259-272. https://doi.org/10.1007/s10457-005-3825-y 1572-9680 (electronic) 0167-4366 (print) https://doi.org/10.1007/s10457-005-3825-y eng info:eu-repo/semantics/restrictedAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Springer Nature Agroforestry Systems 67 : 259-272 (2006) |
| spellingShingle | Pastures Photosynthesis Dry Matter Content Light Regimes Leaf Area Index Pastizales Dactylis glomerata Fotosíntesis Régimen de Luz Índice de Area Foliar Contenido de Materia Seca Fluctuating Light Regimes Leaf Canopy Angle Light Interception Regimenes Fluctuantes de Luz Ángulo del Dosel de las Hojas Interceptación de Luz Peri, Pablo Luis Moot, Derrick McNeil, David L. Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes |
| title | Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes |
| title_full | Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes |
| title_fullStr | Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes |
| title_full_unstemmed | Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes |
| title_short | Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes |
| title_sort | validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes |
| topic | Pastures Photosynthesis Dry Matter Content Light Regimes Leaf Area Index Pastizales Dactylis glomerata Fotosíntesis Régimen de Luz Índice de Area Foliar Contenido de Materia Seca Fluctuating Light Regimes Leaf Canopy Angle Light Interception Regimenes Fluctuantes de Luz Ángulo del Dosel de las Hojas Interceptación de Luz |
| url | http://hdl.handle.net/20.500.12123/24097 https://link.springer.com/article/10.1007/s10457-005-3825-y https://doi.org/10.1007/s10457-005-3825-y |
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