Energy, water vapor and carbon fluxes in Andean agroecosystems: conceptualization and methodological standardization
| Autor: | Andrés Javier Peña Quiñones, Víctor Hugo Ramírez Builes, Apolinar Figueroa Casas, Angela María Castaño Marín, Néstor Miguel Riaño Herrera, Arley Valencia Salazar, Gerardo Antonio Góez Vinasco |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Agroecosystem 010504 meteorology & atmospheric sciences Eddy covariance Soil Science gas exchange Atmospheric sciences 01 natural sciences Atmosphere 63 Agricultura y tecnologías relacionadas / Agriculture lcsh:Agriculture Agroecosystem coffee Evapotranspiration eddy covariance Ecosystem 0105 earth and related environmental sciences Sunlight Agroforestry lcsh:S Carbon sink energy fluxes Andean hillslope Environmental science Shading Agronomy and Crop Science 55 Ciencias de la tierra / Earth sciences and geology 010606 plant biology & botany |
| Zdroj: | Acta Agronómica, Vol 66, Iss 1, Pp 27-34 (2017) Repositorio UN Universidad Nacional de Colombia instacron:Universidad Nacional de Colombia |
| ISSN: | 2323-0118 0120-2812 |
| Popis: | This paper presents the conceptualization, methodological adjustment and experimental application of the micrometeorological technique eddy covariance - EC, to measure energy, water vapor and CO2 fluxes in two coffee agroecosystems: the first under full sunlight, and the second under shade, both with equatorial Andean hillslope conditions. With a footprint and fetch calculation, the required distance from the edge of the field in the prevailing wind direction to the EC tower is three times higher under shade than full sun. The shaded agroecosystem reached maximum average carbon fixation rates of 21.26 ± 2.469 μmolCO2.m-2s-1 ( = 0.05) (61% higher than under 100% sunlight) which gives a high carbon sink capacity to the association of coffee plants with shading Pigeon peas (Cajanus cajan L). The average evapotranspiration rate was 2.33 ± 0.0102 mm.d-1 ( = 0.05) and 2.08 ± 0.00732 mm.d-1 under shade and 100% sunlight, respectively. The proportion of net radiation that reached the soil was 2% under shade and 4% under 100% sunlight. Likewise, the soil energy loss during the night was lower under shade, indicating less day-night temperature range in the latter agroecosystem. The methodological adjustment and the results of this first work using EC in Colombian coffee plantations, contribute to the development of reliable research regarding gas and energy exchanges between the atmosphere and ecosystems in conditions of the equatorial Andean hillslope. |
| Databáze: | OpenAIRE |
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