Organic C distribution and N mineralization in soil of oak woodlands with improved pastures

Detalhes bibliográficos
Autor(a) principal: Gómez-Rey, Maria Xesús
Data de Publicação: 2018
Outros Autores: Garcês, Ana, Madeira, Manuel
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: https://doi.org/10.19084/rca.15915
Resumo: Cork oak woodlands in Portugal are a multipurpose agroforestry system occurring in areas mostly degraded by former cereal crops and overgrazing. The objective of this study was to evaluate the effect of scattered cork oak trees (Quercus suber L.) on soil quality, considering two land use systems: unmanaged pastures and improved pastures. Soil samples were collected in a square grid around scattered cork oak trees to evaluate the spatial variability of soil bulk density and chemical properties. In soil samples taken beneath tree canopy and in the open, net N mineralization was evaluated by aerobic incubations. Also, laboratory incubations were carried out to evaluate the effect of roots (tree or/and herbaceous) and water solutions (bulk precipitation, throughfall or stemflow) on net N mineralization.Contents of organic C, total N and extractable P were increased beneath the tree canopy, and gradually decreased with the increase of distance to the tree trunk. Improved pastures established 26 years ago increased organic C (0.76 kg m-2), total N (0.06 kg m-2) and extractable P (2.70 g m-2) amounts in the 0-10 cm soil layer beneath the tree canopy relatively to those of unmanaged pastures. Net N mineralization was significantly greater (about 2 times) in soils beneath the tree canopy than in those of open areas. N mineralization was unaffected by addition of throughfall or stemflow, while a significant reduction resulted from tree roots addition, this effect being stronger for herbaceous plant roots than for tree roots. Maintenance of tree cover combined with permanent improved pastures should be considered to improve soil quality in oak woodlands of Southern Portugal.
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spelling Organic C distribution and N mineralization in soil of oak woodlands with improved pasturesDistribuição espacial do C orgânico e da mineralização de N em solos de montado com pastagem melhoradaGeralCork oak woodlands in Portugal are a multipurpose agroforestry system occurring in areas mostly degraded by former cereal crops and overgrazing. The objective of this study was to evaluate the effect of scattered cork oak trees (Quercus suber L.) on soil quality, considering two land use systems: unmanaged pastures and improved pastures. Soil samples were collected in a square grid around scattered cork oak trees to evaluate the spatial variability of soil bulk density and chemical properties. In soil samples taken beneath tree canopy and in the open, net N mineralization was evaluated by aerobic incubations. Also, laboratory incubations were carried out to evaluate the effect of roots (tree or/and herbaceous) and water solutions (bulk precipitation, throughfall or stemflow) on net N mineralization.Contents of organic C, total N and extractable P were increased beneath the tree canopy, and gradually decreased with the increase of distance to the tree trunk. Improved pastures established 26 years ago increased organic C (0.76 kg m-2), total N (0.06 kg m-2) and extractable P (2.70 g m-2) amounts in the 0-10 cm soil layer beneath the tree canopy relatively to those of unmanaged pastures. Net N mineralization was significantly greater (about 2 times) in soils beneath the tree canopy than in those of open areas. N mineralization was unaffected by addition of throughfall or stemflow, while a significant reduction resulted from tree roots addition, this effect being stronger for herbaceous plant roots than for tree roots. Maintenance of tree cover combined with permanent improved pastures should be considered to improve soil quality in oak woodlands of Southern Portugal.O montado em Portugal corresponde a um sistema multifuncional que ocorre em áreas frequentemente degradadas pelo cultivo de cereais e de sobre pastoreio. O objectivo deste estudo foi avaliar a influência das árvores espaçadas na variação do C orgânico, N total e P extraível num montado (Quercus suber L.) com pastagem melhorada (instalada há 26 anos) e sujeito a gestão intensiva e noutro com a vegetação herbácea natural. Amostras de solos foram colhidas numa quadrícula em torno de sobreiros espaçados, sob a respectiva copa e fora da influência da mesma, para avaliar a variabilidade espacial da massa volúmica e propriedades químicas do solo. Estudou-se a mineralização líquida de N através de incubações aeróbias. Também se efectuaram incubações para avaliar o efeito da precipitação interna (gotejo e escorrimento pelo tronco) e das raízes das herbáceas e das árvores na mineralização líquida de N. Os teores de C, N e P foram superiores no solo da área sob a projecção vertical da copa da árvore, observando-se o seu decréscimo com o aumento da distância ao tronco da mesma. A instalação de pastagem melhorada determinou um aumento das quantidades de C orgânico (0.76 kg m-2), N total (0.06 kg m-2) e P extraível (2.70 g m-2) sob a árvore (0-10 cm) comparativamente à área com vegetação herbácea natural. A mineralização líquida de N foi significativamente superior (cerca de 2 vezes) na área sob a copa da árvore do que naquela fora da influência desta. A adição de gotejo não influenciou a mineralização líquida do N, enquanto as raízes, tanto das árvores como sobretudo da vegetação herbácea, contribuiram para o seu decréscimo. Com vista a melhorar a qualidade do solo e o sequestro de carbono, deverá ser equacionada a manutenção das árvores associada a sistemas de gestão adequados à sustentabilidade do ecossistema, que poderão passar pela instalação de pastagens melhoradas.Sociedade de Ciências Agrárias de Portugal2018-12-06T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttps://doi.org/10.19084/rca.15915eng2183-041X0871-018XGómez-Rey, Maria XesúsGarcês, AnaMadeira, Manuelinfo: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:RCAAP2022-09-06T09:24:02Zoai:ojs.revistas.rcaap.pt:article/15915Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:30:40.268069Repositório 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 Organic C distribution and N mineralization in soil of oak woodlands with improved pastures
Distribuição espacial do C orgânico e da mineralização de N em solos de montado com pastagem melhorada
title Organic C distribution and N mineralization in soil of oak woodlands with improved pastures
spellingShingle Organic C distribution and N mineralization in soil of oak woodlands with improved pastures
Gómez-Rey, Maria Xesús
Geral
title_short Organic C distribution and N mineralization in soil of oak woodlands with improved pastures
title_full Organic C distribution and N mineralization in soil of oak woodlands with improved pastures
title_fullStr Organic C distribution and N mineralization in soil of oak woodlands with improved pastures
title_full_unstemmed Organic C distribution and N mineralization in soil of oak woodlands with improved pastures
title_sort Organic C distribution and N mineralization in soil of oak woodlands with improved pastures
author Gómez-Rey, Maria Xesús
author_facet Gómez-Rey, Maria Xesús
Garcês, Ana
Madeira, Manuel
author_role author
author2 Garcês, Ana
Madeira, Manuel
author2_role author
author
dc.contributor.author.fl_str_mv Gómez-Rey, Maria Xesús
Garcês, Ana
Madeira, Manuel
dc.subject.por.fl_str_mv Geral
topic Geral
description Cork oak woodlands in Portugal are a multipurpose agroforestry system occurring in areas mostly degraded by former cereal crops and overgrazing. The objective of this study was to evaluate the effect of scattered cork oak trees (Quercus suber L.) on soil quality, considering two land use systems: unmanaged pastures and improved pastures. Soil samples were collected in a square grid around scattered cork oak trees to evaluate the spatial variability of soil bulk density and chemical properties. In soil samples taken beneath tree canopy and in the open, net N mineralization was evaluated by aerobic incubations. Also, laboratory incubations were carried out to evaluate the effect of roots (tree or/and herbaceous) and water solutions (bulk precipitation, throughfall or stemflow) on net N mineralization.Contents of organic C, total N and extractable P were increased beneath the tree canopy, and gradually decreased with the increase of distance to the tree trunk. Improved pastures established 26 years ago increased organic C (0.76 kg m-2), total N (0.06 kg m-2) and extractable P (2.70 g m-2) amounts in the 0-10 cm soil layer beneath the tree canopy relatively to those of unmanaged pastures. Net N mineralization was significantly greater (about 2 times) in soils beneath the tree canopy than in those of open areas. N mineralization was unaffected by addition of throughfall or stemflow, while a significant reduction resulted from tree roots addition, this effect being stronger for herbaceous plant roots than for tree roots. Maintenance of tree cover combined with permanent improved pastures should be considered to improve soil quality in oak woodlands of Southern Portugal.
publishDate 2018
dc.date.none.fl_str_mv 2018-12-06T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv https://doi.org/10.19084/rca.15915
url https://doi.org/10.19084/rca.15915
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 2183-041X
0871-018X
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dc.publisher.none.fl_str_mv Sociedade de Ciências Agrárias de Portugal
publisher.none.fl_str_mv Sociedade de Ciências Agrárias de Portugal
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
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