Evaluation of the sap flow determined with a heat balance method to measure the transpiration of a sugarcane canopy |
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| Institution: | 1. Cemagref, Agricultural and Environmental Engineering Research, Antony Regional Centre, Parc de Tourvoie, BP.44, 92163 Antony Cedex, France;2. Cemagref, Agricultural and Environmental Engineering Research, Montpellier Regional Center, Domaine de Lavalette, 361 rue J.-F. Breton, B.P. 5095, F-34033 Montpellier Cedex, France;3. World Water Council, Les Docks de la Joliette, Atrium 10.3, 10 place de la Joliette, 13002 Marseille, France;1. South African Sugarcane Research Institute, Mount Edgecombe, South Africa;2. Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa;1. Graduate Program in Tropical Agriculture, Colegio de Postgraduados Campus Campeche, Carretera Haltunchen-Edzna, Km 17.5, Sihochac, Champotón, Campeche, C.P. 24450, Mexico;2. Colegio de Postgraduados Campus Campeche, Carretera Haltunchen-Edzna, Km 17.5, Sihochac, Champotón, Campeche, C.P. 24450, Mexico;3. Colegio de Postgraduados, Campus Tabasco, Periférico Carlos A. Molina s/n, C.P. 86500, H. Cárdenas, Tabasco, Mexico;4. Colegio de Postgraduados Campus Veracruz, Carretera federal Xalapa-Veracruz km 88.5, C.P. 91700, Veracruz, Mexico;1. Faculty of Geo-information Science and Earth Observation (ITC), University of Twente, Enschede, The Netherlands;2. Critical Zone Hydrology Group, Faculty of Earth and Life Sciences, VU University, Amsterdam, The Netherlands;3. Formerly at Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 085403, USA;1. The Cyprus Institute, Energy, Environment and Water Research Center (EEWRC), Nicosia, Cyprus;2. University of Twente, ITC, Enschede, Netherlands;3. Department of Forests, Ministry of Agriculture, Natural Resources and Environment, Nicosia, Cyprus;4. Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, Italy |
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| Abstract: | Sap flow measurements based on the heat balance method offers the opportunity to evaluate directly and quite easily the mass flow rate of water in plants. However, extrapolation of measurements of water use by individual stems to that for a canopy is tricky. In the present study, 14 sugarcane stems, out of a canopy of nearly 200 000, were equipped with Dynamax sap flow gauge. We extrapolated these individual measurements to determine the transpiration of the canopy and compare this transpiration to the crop evapotranspiration calculated on the basis of the Penman–Monteith method. The method used for the extrapolation assumes that the transpiration of a sugarcane plant is proportional to its leaf area. Transpiration of the canopy determined by this method was overestimated by more 35% as compared to the reference evapotranspiration results. Different sources of possible errors were examined and lead to suppose that it is very difficult to determine the transpiration of a heterogeneous canopy in growth by using the sap flow measurement technique. |
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