Changes in evapotranspiration from an oil palm stand (Elaeis guineensis Jacq.) exposed to seasonal soil water deficits
Evapotranspiration (E) and interception losses (I(n)) from a stand of oil palm trees (Elaeis guineensis Jacq.) were measured weekly from 1988 to 1990 using a water balance method. Stomatal conductance, leaf area index and climatological parameters were measured and used to calculate the rate of transpiration (T) from canopy of oil palm stand using the Penman-Monteith equation. At high values of soil water storage in the root zone the evapotranspiration rate of the stand was 81% of the potential evaporation (E(p), PENMAN, 1948; modified by VAN BAVEL, 1966), the ratio of the transpiration rate to the potential evaporation (T/E(p)) varied from 0.69 to 0.72 and the stomatal conductance (g) varied from 6.0 to 6.6 mm.s-1. During the 1988 dry season, which was the more pronounced one, E/E(p) and T/E(p) were reduced to respectively 0.56 and 0.35. Net interception during rainy and dry seasons were respectively 11% and 5% of the potential evaporation. During the three dry seasons observed, the fraction of extractable water in the rooted zone of the soil (5.2 m deep) remained above 0.4 as a consequence of early stomatal closure which occurred when fractional extractable water of the top 80 cm of soil (f80) decreased below 0.67. When f80 decreased below 0.35, E/E(p) decreased sharply to a value of 0.1 corresponding to a stomatal conductance of about 1.5 mm.s-1 (Author's abstract)
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Subjects: | F61 - Physiologie végétale - Nutrition, Elaeis guineensis, évapotranspiration, couvert, déficit d'humidité du sol, http://aims.fao.org/aos/agrovoc/c_2509, http://aims.fao.org/aos/agrovoc/c_2741, http://aims.fao.org/aos/agrovoc/c_1262, http://aims.fao.org/aos/agrovoc/c_25307, |
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dig-cirad-fr-3928482024-01-28T00:10:35Z http://agritrop.cirad.fr/392848/ http://agritrop.cirad.fr/392848/ Changes in evapotranspiration from an oil palm stand (Elaeis guineensis Jacq.) exposed to seasonal soil water deficits. Dufrêne E., Dubos Bernard, Rey Hervé, Quencez Pierre, Saugier B.. 1992. Acta Oecologica, 13 (3) : 299-314. Changes in evapotranspiration from an oil palm stand (Elaeis guineensis Jacq.) exposed to seasonal soil water deficits Dufrêne, E. Dubos, Bernard Rey, Hervé Quencez, Pierre Saugier, B. eng 1992 Acta Oecologica F61 - Physiologie végétale - Nutrition Elaeis guineensis évapotranspiration couvert déficit d'humidité du sol http://aims.fao.org/aos/agrovoc/c_2509 http://aims.fao.org/aos/agrovoc/c_2741 http://aims.fao.org/aos/agrovoc/c_1262 http://aims.fao.org/aos/agrovoc/c_25307 Evapotranspiration (E) and interception losses (I(n)) from a stand of oil palm trees (Elaeis guineensis Jacq.) were measured weekly from 1988 to 1990 using a water balance method. Stomatal conductance, leaf area index and climatological parameters were measured and used to calculate the rate of transpiration (T) from canopy of oil palm stand using the Penman-Monteith equation. At high values of soil water storage in the root zone the evapotranspiration rate of the stand was 81% of the potential evaporation (E(p), PENMAN, 1948; modified by VAN BAVEL, 1966), the ratio of the transpiration rate to the potential evaporation (T/E(p)) varied from 0.69 to 0.72 and the stomatal conductance (g) varied from 6.0 to 6.6 mm.s-1. During the 1988 dry season, which was the more pronounced one, E/E(p) and T/E(p) were reduced to respectively 0.56 and 0.35. Net interception during rainy and dry seasons were respectively 11% and 5% of the potential evaporation. During the three dry seasons observed, the fraction of extractable water in the rooted zone of the soil (5.2 m deep) remained above 0.4 as a consequence of early stomatal closure which occurred when fractional extractable water of the top 80 cm of soil (f80) decreased below 0.67. When f80 decreased below 0.35, E/E(p) decreased sharply to a value of 0.1 corresponding to a stomatal conductance of about 1.5 mm.s-1 (Author's abstract) article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/closedAccess http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=91805 |
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F61 - Physiologie végétale - Nutrition Elaeis guineensis évapotranspiration couvert déficit d'humidité du sol http://aims.fao.org/aos/agrovoc/c_2509 http://aims.fao.org/aos/agrovoc/c_2741 http://aims.fao.org/aos/agrovoc/c_1262 http://aims.fao.org/aos/agrovoc/c_25307 F61 - Physiologie végétale - Nutrition Elaeis guineensis évapotranspiration couvert déficit d'humidité du sol http://aims.fao.org/aos/agrovoc/c_2509 http://aims.fao.org/aos/agrovoc/c_2741 http://aims.fao.org/aos/agrovoc/c_1262 http://aims.fao.org/aos/agrovoc/c_25307 |
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F61 - Physiologie végétale - Nutrition Elaeis guineensis évapotranspiration couvert déficit d'humidité du sol http://aims.fao.org/aos/agrovoc/c_2509 http://aims.fao.org/aos/agrovoc/c_2741 http://aims.fao.org/aos/agrovoc/c_1262 http://aims.fao.org/aos/agrovoc/c_25307 F61 - Physiologie végétale - Nutrition Elaeis guineensis évapotranspiration couvert déficit d'humidité du sol http://aims.fao.org/aos/agrovoc/c_2509 http://aims.fao.org/aos/agrovoc/c_2741 http://aims.fao.org/aos/agrovoc/c_1262 http://aims.fao.org/aos/agrovoc/c_25307 Dufrêne, E. Dubos, Bernard Rey, Hervé Quencez, Pierre Saugier, B. Changes in evapotranspiration from an oil palm stand (Elaeis guineensis Jacq.) exposed to seasonal soil water deficits |
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Evapotranspiration (E) and interception losses (I(n)) from a stand of oil palm trees (Elaeis guineensis Jacq.) were measured weekly from 1988 to 1990 using a water balance method. Stomatal conductance, leaf area index and climatological parameters were measured and used to calculate the rate of transpiration (T) from canopy of oil palm stand using the Penman-Monteith equation. At high values of soil water storage in the root zone the evapotranspiration rate of the stand was 81% of the potential evaporation (E(p), PENMAN, 1948; modified by VAN BAVEL, 1966), the ratio of the transpiration rate to the potential evaporation (T/E(p)) varied from 0.69 to 0.72 and the stomatal conductance (g) varied from 6.0 to 6.6 mm.s-1. During the 1988 dry season, which was the more pronounced one, E/E(p) and T/E(p) were reduced to respectively 0.56 and 0.35. Net interception during rainy and dry seasons were respectively 11% and 5% of the potential evaporation. During the three dry seasons observed, the fraction of extractable water in the rooted zone of the soil (5.2 m deep) remained above 0.4 as a consequence of early stomatal closure which occurred when fractional extractable water of the top 80 cm of soil (f80) decreased below 0.67. When f80 decreased below 0.35, E/E(p) decreased sharply to a value of 0.1 corresponding to a stomatal conductance of about 1.5 mm.s-1 (Author's abstract) |
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F61 - Physiologie végétale - Nutrition Elaeis guineensis évapotranspiration couvert déficit d'humidité du sol http://aims.fao.org/aos/agrovoc/c_2509 http://aims.fao.org/aos/agrovoc/c_2741 http://aims.fao.org/aos/agrovoc/c_1262 http://aims.fao.org/aos/agrovoc/c_25307 |
author |
Dufrêne, E. Dubos, Bernard Rey, Hervé Quencez, Pierre Saugier, B. |
author_facet |
Dufrêne, E. Dubos, Bernard Rey, Hervé Quencez, Pierre Saugier, B. |
author_sort |
Dufrêne, E. |
title |
Changes in evapotranspiration from an oil palm stand (Elaeis guineensis Jacq.) exposed to seasonal soil water deficits |
title_short |
Changes in evapotranspiration from an oil palm stand (Elaeis guineensis Jacq.) exposed to seasonal soil water deficits |
title_full |
Changes in evapotranspiration from an oil palm stand (Elaeis guineensis Jacq.) exposed to seasonal soil water deficits |
title_fullStr |
Changes in evapotranspiration from an oil palm stand (Elaeis guineensis Jacq.) exposed to seasonal soil water deficits |
title_full_unstemmed |
Changes in evapotranspiration from an oil palm stand (Elaeis guineensis Jacq.) exposed to seasonal soil water deficits |
title_sort |
changes in evapotranspiration from an oil palm stand (elaeis guineensis jacq.) exposed to seasonal soil water deficits |
url |
http://agritrop.cirad.fr/392848/ |
work_keys_str_mv |
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