Soil water regime under pasture in the humid zone of spain: Validation of an empirical model and prediction of irrigation requirements |
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| Institution: | 1. U.S. Geological Survey Earth Resources Observation and Science Center, Sioux Falls, SD 57198, USA;2. ASRC Federal Data Solutions (AFDS), Contractor to the USGS EROS, Sioux Falls, SD 57198, USA;3. NOAA/NESDIS, Center for Satellite Applications and Research, College Park, MD 20740, USA;4. U.S. Geological Survey National Land Imaging Program, Flagstaff, AZ 86001, USA;5. U.S. Environmental Protection Agency, Washington, DC, USA;1. Forest and Wood Technology Research Centre (CETEMAS), Pumarabule, Carbayín, s/n, 33936 Siero, Asturias, Spain;2. Departamento de Ciencias Agroforestales, Universidad de Huelva, Crta. Palos-La Rábida s/n, 21819 Palos de la Frontera, Spain;3. Dept. Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Crta. Utrera km. 1, 41013 Sevilla, Spain;4. Instituto Pirenaico de Ecología (IPE-CSIC), Avda. Montañana 1005, 50192 Zaragoza, Spain;5. Centro de Edafología y Biología Aplicada del Segura (CEBAS-CSIC), Campus Universitario de Espinardo, PO Box 164, 30100 Murcia, Spain;6. Depto. Ciencias Agroforestales, iUFOR-Universidad de Valladolid, Campus Duques de Soria, 42004 Soria, Spain;1. School of Information and Electronics, Beijing Institute of Technology, Room 316, Building 4, 5 Zhongguancun South Street, Beijing 100081, China;2. Department of Radiology, Peking University Third Hospital, Beijing, China |
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| Abstract: | In the spanish humid zone, the irregular within-year distribution of rainfall often leads to a need for supplementary irrigation during the summer. In the Terra Chd region of Galicia (northwest Spain), this is the case despite the hydromorphic characteristics of the soil. During 1990, we used a neutron probe to monitor variation in soil water content under rainfed grassland. Soil water balance over the study period was also simulated with an empirical model, ISAREG. In general, there was good agreement between measured and predicted soil water storage; cumulative water use was also satisfactorily predicted. The model was then used to predict the probability distribution of annual net irrigation requirements for pasture in this area, on the basis of 24 years' climatic data. Interannual variation was very high, with modelled requirement ranging from 0 to 232 mm. In view of this variability it is not possible to reliably predict the optimum irrigation schedule at the start of each growing season. Finally, we discuss various aspects of irrigation management in this area, taking into account soil available water and climate. |
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