Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil
A micrometeorological experiment was conducted over grasslands in a semi-arid region of north-eastern Brazil (São João, Pernambuco) from January to December 2011, using the Bowen ratio energy balance method, to improve the current understanding of energy...
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| Language: | English |
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Universidade Federal de Campina Grande
2015-01-01
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| Series: | Revista Brasileira de Engenharia Agrícola e Ambiental |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100003&lng=en&tlng=en |
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| author | Patrícia S. de S. Gondim José R. de S. Lima Antonio C. D. Antonino Claude Hammecker Renan A. B. da Silva Clarissa A. Gomes |
| author_facet | Patrícia S. de S. Gondim José R. de S. Lima Antonio C. D. Antonino Claude Hammecker Renan A. B. da Silva Clarissa A. Gomes |
| author_sort | Patrícia S. de S. Gondim |
| collection | DOAJ |
| description | A micrometeorological experiment was conducted over grasslands in a semi-arid region of north-eastern Brazil (São João, Pernambuco) from January to December 2011, using the Bowen ratio energy balance method, to improve the current understanding of energy partitioning and water vapour exchange over this ecosystem in this region. The objectives of the present study were to quantify the seasonal and diurnal variations in energy and water vapour exchanges over grasslands and understand the biotic and abiotic factors controlling the energy partitioning of this ecosystem. In the dry period, the low stored soil water limited the grass production and leaf area index, and as a consequence of these conditions, most of the annual net radiation (58%) was consumed in sensible heat flux. During the course of the study the evaporative fraction was linearly related to the leaf area index. The total annual evapotranspiration and its daily maximum were 543.8 mm and 3.14 mm d-1. The seasonal and diurnal variations in energy partitioning and evapotranspiration were controlled by soil water availability and leaf area index. |
| format | Article |
| id | doaj-art-53d09809a02e4f11aed63f765d6449f2 |
| institution | OA Journals |
| issn | 1807-1929 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Universidade Federal de Campina Grande |
| record_format | Article |
| series | Revista Brasileira de Engenharia Agrícola e Ambiental |
| spelling | doaj-art-53d09809a02e4f11aed63f765d6449f22025-08-20T01:57:20ZengUniversidade Federal de Campina GrandeRevista Brasileira de Engenharia Agrícola e Ambiental1807-19292015-01-011913810.1590/1807-1929/agriambi.v19n1p3-8S1415-43662015000100003Environmental control on water vapour and energy exchanges over grasslands in semiarid region of BrazilPatrícia S. de S. GondimJosé R. de S. LimaAntonio C. D. AntoninoClaude HammeckerRenan A. B. da SilvaClarissa A. GomesA micrometeorological experiment was conducted over grasslands in a semi-arid region of north-eastern Brazil (São João, Pernambuco) from January to December 2011, using the Bowen ratio energy balance method, to improve the current understanding of energy partitioning and water vapour exchange over this ecosystem in this region. The objectives of the present study were to quantify the seasonal and diurnal variations in energy and water vapour exchanges over grasslands and understand the biotic and abiotic factors controlling the energy partitioning of this ecosystem. In the dry period, the low stored soil water limited the grass production and leaf area index, and as a consequence of these conditions, most of the annual net radiation (58%) was consumed in sensible heat flux. During the course of the study the evaporative fraction was linearly related to the leaf area index. The total annual evapotranspiration and its daily maximum were 543.8 mm and 3.14 mm d-1. The seasonal and diurnal variations in energy partitioning and evapotranspiration were controlled by soil water availability and leaf area index.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100003&lng=en&tlng=enevapotranspiraçãoumidade do soloíndice de área foliar |
| spellingShingle | Patrícia S. de S. Gondim José R. de S. Lima Antonio C. D. Antonino Claude Hammecker Renan A. B. da Silva Clarissa A. Gomes Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil Revista Brasileira de Engenharia Agrícola e Ambiental evapotranspiração umidade do solo índice de área foliar |
| title | Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil |
| title_full | Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil |
| title_fullStr | Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil |
| title_full_unstemmed | Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil |
| title_short | Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil |
| title_sort | environmental control on water vapour and energy exchanges over grasslands in semiarid region of brazil |
| topic | evapotranspiração umidade do solo índice de área foliar |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100003&lng=en&tlng=en |
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