Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Brasileira de Engenharia Agrícola e Ambiental (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100003 |
Resumo: | 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. |
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Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazilevapotranspirationsoil water contentleaf area indexA 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.Departamento de Engenharia Agrícola - UFCG2015-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100003Revista Brasileira de Engenharia Agrícola e Ambiental v.19 n.1 2015reponame:Revista Brasileira de Engenharia Agrícola e Ambiental (Online)instname:Universidade Federal de Campina Grande (UFCG)instacron:UFCG10.1590/1807-1929/agriambi.v19n1p3-8info:eu-repo/semantics/openAccessGondim,Patrícia S. de S.Lima,José R. de S.Antonino,Antonio C. D.Hammecker,ClaudeSilva,Renan A. B. daGomes,Clarissa A.eng2015-10-09T00:00:00Zoai:scielo:S1415-43662015000100003Revistahttp://www.scielo.br/rbeaaPUBhttps://old.scielo.br/oai/scielo-oai.php||agriambi@agriambi.com.br1807-19291415-4366opendoar:2015-10-09T00:00Revista Brasileira de Engenharia Agrícola e Ambiental (Online) - Universidade Federal de Campina Grande (UFCG)false |
dc.title.none.fl_str_mv |
Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil |
title |
Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil |
spellingShingle |
Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil Gondim,Patrícia S. de S. evapotranspiration soil water content leaf area index |
title_short |
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_sort |
Environmental control on water vapour and energy exchanges over grasslands in semiarid region of Brazil |
author |
Gondim,Patrícia S. de S. |
author_facet |
Gondim,Patrícia S. de S. Lima,José R. de S. Antonino,Antonio C. D. Hammecker,Claude Silva,Renan A. B. da Gomes,Clarissa A. |
author_role |
author |
author2 |
Lima,José R. de S. Antonino,Antonio C. D. Hammecker,Claude Silva,Renan A. B. da Gomes,Clarissa A. |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Gondim,Patrícia S. de S. Lima,José R. de S. Antonino,Antonio C. D. Hammecker,Claude Silva,Renan A. B. da Gomes,Clarissa A. |
dc.subject.por.fl_str_mv |
evapotranspiration soil water content leaf area index |
topic |
evapotranspiration soil water content leaf area index |
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. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100003 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100003 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1807-1929/agriambi.v19n1p3-8 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Departamento de Engenharia Agrícola - UFCG |
publisher.none.fl_str_mv |
Departamento de Engenharia Agrícola - UFCG |
dc.source.none.fl_str_mv |
Revista Brasileira de Engenharia Agrícola e Ambiental v.19 n.1 2015 reponame:Revista Brasileira de Engenharia Agrícola e Ambiental (Online) instname:Universidade Federal de Campina Grande (UFCG) instacron:UFCG |
instname_str |
Universidade Federal de Campina Grande (UFCG) |
instacron_str |
UFCG |
institution |
UFCG |
reponame_str |
Revista Brasileira de Engenharia Agrícola e Ambiental (Online) |
collection |
Revista Brasileira de Engenharia Agrícola e Ambiental (Online) |
repository.name.fl_str_mv |
Revista Brasileira de Engenharia Agrícola e Ambiental (Online) - Universidade Federal de Campina Grande (UFCG) |
repository.mail.fl_str_mv |
||agriambi@agriambi.com.br |
_version_ |
1750297683590905856 |