Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during spring
Autor(a) principal: | |
---|---|
Data de Publicação: | 2009 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.5/9017 |
Resumo: | Montado are spatially heterogeneous ecosystems that are economically important for the production of cork and herbaceous biomass that provide fodder for animals. Understanding of how trees and the herbaceous layer interact to determine pasture yield and the overall CO2 exchange of the herbaceous layer is crucial. Portable chamberswere used to study CO2 exchange by the herbaceous layer component of the montado ecosystem in southern Portugal. Biomass, Net herbaceous layer CO2 exchange (NEE) and respiration (Reco) were measured in the open and understory locations between March and May, during the active growing period. Parameter fits on the NEE data were performed using empirical hyperbolic light response model, while ecosystem respiration (Reco) data were fitted with a two-parameter exponential model. Annual green biomass productions were 405.8 9.0 and 250.6 6.3 g m 2 in the open and the understory, respectively. The respective maximum NEE during the day were 24.0 2.9 and 9.6 2.2 mmol m 2 s 1 while maximum Reco were 20.6 2.2 and 10.0 1.6 mmol m 2 s 1, occurring in April. Photosynthetic photon flux density (PPFD) explained more that 70% of variations in daytime NEE while soil temperature at 10 cm depth (Tsoil) explained >50% of the variations in Reco under non-limiting soil moisture conditions. Both the herbaceous layer communities shared similar plant functional types and no significant difference in nutrient nitrogen (N) occurred between them. The two herbaceous layer components shared similar physiological characteristics and differences that arose in their CO2 uptake capacities and green biomass production were the result of microclimatic differences created by tree shading |
id |
RCAP_b0bf0764c9f35b74910fbb43765cc2a1 |
---|---|
oai_identifier_str |
oai:www.repository.utl.pt:10400.5/9017 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during springecosystem productivityenvironmental regulatorsherbaceous layermontadonet ecosystems Co2 exchangespring periodsoil moistureMontado are spatially heterogeneous ecosystems that are economically important for the production of cork and herbaceous biomass that provide fodder for animals. Understanding of how trees and the herbaceous layer interact to determine pasture yield and the overall CO2 exchange of the herbaceous layer is crucial. Portable chamberswere used to study CO2 exchange by the herbaceous layer component of the montado ecosystem in southern Portugal. Biomass, Net herbaceous layer CO2 exchange (NEE) and respiration (Reco) were measured in the open and understory locations between March and May, during the active growing period. Parameter fits on the NEE data were performed using empirical hyperbolic light response model, while ecosystem respiration (Reco) data were fitted with a two-parameter exponential model. Annual green biomass productions were 405.8 9.0 and 250.6 6.3 g m 2 in the open and the understory, respectively. The respective maximum NEE during the day were 24.0 2.9 and 9.6 2.2 mmol m 2 s 1 while maximum Reco were 20.6 2.2 and 10.0 1.6 mmol m 2 s 1, occurring in April. Photosynthetic photon flux density (PPFD) explained more that 70% of variations in daytime NEE while soil temperature at 10 cm depth (Tsoil) explained >50% of the variations in Reco under non-limiting soil moisture conditions. Both the herbaceous layer communities shared similar plant functional types and no significant difference in nutrient nitrogen (N) occurred between them. The two herbaceous layer components shared similar physiological characteristics and differences that arose in their CO2 uptake capacities and green biomass production were the result of microclimatic differences created by tree shadingElsevierRepositório da Universidade de LisboaHussain, M.Z.Otieno, D.O.Mirzae, H.Li, Y.L.Schmidt, M.W.T.Siebke, L.Foken, T.Ribeiro, N.A.Pereira, J.S.Tenhunen, J.D.2015-07-20T15:27:20Z20092009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/9017eng"Agriculture, Ecosystems and Environment". ISSN 0167-8809. 132 (2009) 143-15210:1016/j.agee.2009.03.008info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-06T14:39:32Zoai:www.repository.utl.pt:10400.5/9017Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:55:52.011033Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during spring |
title |
Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during spring |
spellingShingle |
Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during spring Hussain, M.Z. ecosystem productivity environmental regulators herbaceous layer montado net ecosystems Co2 exchange spring period soil moisture |
title_short |
Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during spring |
title_full |
Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during spring |
title_fullStr |
Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during spring |
title_full_unstemmed |
Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during spring |
title_sort |
Co2 exchange and biomass development of the herbaceous vegetation in the portuguese montado ecosystem during spring |
author |
Hussain, M.Z. |
author_facet |
Hussain, M.Z. Otieno, D.O. Mirzae, H. Li, Y.L. Schmidt, M.W.T. Siebke, L. Foken, T. Ribeiro, N.A. Pereira, J.S. Tenhunen, J.D. |
author_role |
author |
author2 |
Otieno, D.O. Mirzae, H. Li, Y.L. Schmidt, M.W.T. Siebke, L. Foken, T. Ribeiro, N.A. Pereira, J.S. Tenhunen, J.D. |
author2_role |
author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Hussain, M.Z. Otieno, D.O. Mirzae, H. Li, Y.L. Schmidt, M.W.T. Siebke, L. Foken, T. Ribeiro, N.A. Pereira, J.S. Tenhunen, J.D. |
dc.subject.por.fl_str_mv |
ecosystem productivity environmental regulators herbaceous layer montado net ecosystems Co2 exchange spring period soil moisture |
topic |
ecosystem productivity environmental regulators herbaceous layer montado net ecosystems Co2 exchange spring period soil moisture |
description |
Montado are spatially heterogeneous ecosystems that are economically important for the production of cork and herbaceous biomass that provide fodder for animals. Understanding of how trees and the herbaceous layer interact to determine pasture yield and the overall CO2 exchange of the herbaceous layer is crucial. Portable chamberswere used to study CO2 exchange by the herbaceous layer component of the montado ecosystem in southern Portugal. Biomass, Net herbaceous layer CO2 exchange (NEE) and respiration (Reco) were measured in the open and understory locations between March and May, during the active growing period. Parameter fits on the NEE data were performed using empirical hyperbolic light response model, while ecosystem respiration (Reco) data were fitted with a two-parameter exponential model. Annual green biomass productions were 405.8 9.0 and 250.6 6.3 g m 2 in the open and the understory, respectively. The respective maximum NEE during the day were 24.0 2.9 and 9.6 2.2 mmol m 2 s 1 while maximum Reco were 20.6 2.2 and 10.0 1.6 mmol m 2 s 1, occurring in April. Photosynthetic photon flux density (PPFD) explained more that 70% of variations in daytime NEE while soil temperature at 10 cm depth (Tsoil) explained >50% of the variations in Reco under non-limiting soil moisture conditions. Both the herbaceous layer communities shared similar plant functional types and no significant difference in nutrient nitrogen (N) occurred between them. The two herbaceous layer components shared similar physiological characteristics and differences that arose in their CO2 uptake capacities and green biomass production were the result of microclimatic differences created by tree shading |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009 2009-01-01T00:00:00Z 2015-07-20T15:27:20Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.5/9017 |
url |
http://hdl.handle.net/10400.5/9017 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
"Agriculture, Ecosystems and Environment". ISSN 0167-8809. 132 (2009) 143-152 10:1016/j.agee.2009.03.008 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799131040108773376 |