RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FOREST
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Caatinga |
Texto Completo: | https://periodicos.ufersa.edu.br/caatinga/article/view/8955 |
Resumo: | Seasonally dry tropical forests (SDTF) usually present dry seasons of eight or more months. Considering the concerns about the resilience of SDTF to climate changes, the objective of this study was to evaluate the effect of the rainfall regime on fine root growth in a SDTF. The experiment started at the end of the wet season (July 2015), when fine roots were evaluated and ingrowth cores were implemented. The temporal growth of fine roots in the 0-30 cm soil layer was monitored, considering the 0-10, 10-20, and 20-30 cm sublayers, through six samplings from November 2015 to July 2017. The characteristics evaluated were fine root biomass, fine root length, fine root specific length, and fine root mean diameter. The significances of the root growths over time and space were tested by the Kruskal-Wallis test (p<0.05). Fine roots (Ø<2 mm) were separated and dried in an oven (65 °C) until constant weight. The root length was determined using the Giaroots software. The fine root biomass in July 2015 was 7.7±5.0 Mg ha-1 and the length was 5.0±3.2 km m-2. Fine root growth in SDTF is strongly limited by dry periods, occurring decreases in biomass and length of fine roots in all layers evaluated. Fine root growth occurs predominantly in rainy seasons, with fast response of the root system to rainfall events, mainly in root length. |
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RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FORESTDINÂMICA DA PRODUÇÃO DE RAÍZES FINAS EM FLORESTA TROPICAL SAZONALMENTE SECA ANTE O REGIME PLUVIOMÉTRICOCaatinga. Semiárido. Regime pluviométrico. Profundidade efetiva.Caatinga. Semiarid. Rainfall regime. Effective depth.Seasonally dry tropical forests (SDTF) usually present dry seasons of eight or more months. Considering the concerns about the resilience of SDTF to climate changes, the objective of this study was to evaluate the effect of the rainfall regime on fine root growth in a SDTF. The experiment started at the end of the wet season (July 2015), when fine roots were evaluated and ingrowth cores were implemented. The temporal growth of fine roots in the 0-30 cm soil layer was monitored, considering the 0-10, 10-20, and 20-30 cm sublayers, through six samplings from November 2015 to July 2017. The characteristics evaluated were fine root biomass, fine root length, fine root specific length, and fine root mean diameter. The significances of the root growths over time and space were tested by the Kruskal-Wallis test (p<0.05). Fine roots (Ø<2 mm) were separated and dried in an oven (65 °C) until constant weight. The root length was determined using the Giaroots software. The fine root biomass in July 2015 was 7.7±5.0 Mg ha-1 and the length was 5.0±3.2 km m-2. Fine root growth in SDTF is strongly limited by dry periods, occurring decreases in biomass and length of fine roots in all layers evaluated. Fine root growth occurs predominantly in rainy seasons, with fast response of the root system to rainfall events, mainly in root length. Florestas tropicais sazonalmente secas (FTSS) geralmente apresentam estações secas com oito ou mais meses. Frente ao questionamento de resiliência das FTSS às mudanças climáticas desenvolveu-se essa pesquisa objetivando investigar a dinâmica da biomassa de raízes finas ante o regime pluviométrico. O experimento teve início ao final da estação úmida (jul./2015), quando as raízes finas foram caracterizadas e implantados os núcleos de crescimento interno. A dinâmica temporal das raízes finas foi monitorada na camada de 0-30 cm e as subcamadas de 0-10, 10-20 e 20-30 cm por seis coletas no período de nov./2015 a jul./2017. Os indicadores considerados na investigação foram: biomassa de raízes finas, comprimento de raízes finas, comprimento específico de raízes finas, e diâmetro médio das raízes finas. A significância da dinâmica das raízes no tempo e no espaço foram testadas pelo teste Kruskal-Wallis (p < 0,05). Após a separação, as raízes finas (Ø < 2 mm) foram secas em estufa (65 °C) até massa constante. O comprimento das raízes foi determinado pelo software Giaroots. A biomassa de raízes finas (Ø < 2 mm) em jul./2015 foi de 7,7 ± 5,0 Mg ha-¹ e o comprimento foi de 5,0 ± 3,2 km m-2. A dinâmica das raízes finas em FTSS é fortemente limitada nos períodos secos, ocorrendo perda de biomassa e do comprimento de raízes finas em todas as camadas. A produção de raízes finas ocorre fundamentalmente nas estações chuvosas, com uma rápida resposta de desenvolvimento do sistema radicular à ocorrência de precipitações, principalmente no seu comprimento. Universidade Federal Rural do Semi-Árido2020-05-22info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufersa.edu.br/caatinga/article/view/8955REVISTA CAATINGA; Vol. 33 No. 2 (2020); 458-469Revista Caatinga; v. 33 n. 2 (2020); 458-4691983-21250100-316Xreponame:Revista Caatingainstname:Universidade Federal Rural do Semi-Árido (UFERSA)instacron:UFERSAenghttps://periodicos.ufersa.edu.br/caatinga/article/view/8955/10214Copyright (c) 2020 Revista Caatingainfo:eu-repo/semantics/openAccessAndrade, Eunice Maia deRosa, Gilberto QuevedoAlmeida, Aldenia Mendes Mascena deSilva, Antonio Givanilson Rodrigues daSena, Maria Gina Torres2020-05-22T16:43:33Zoai:ojs.periodicos.ufersa.edu.br:article/8955Revistahttps://periodicos.ufersa.edu.br/index.php/caatinga/indexPUBhttps://periodicos.ufersa.edu.br/index.php/caatinga/oaipatricio@ufersa.edu.br|| caatinga@ufersa.edu.br1983-21250100-316Xopendoar:2020-05-22T16:43:33Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA)false |
dc.title.none.fl_str_mv |
RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FOREST DINÂMICA DA PRODUÇÃO DE RAÍZES FINAS EM FLORESTA TROPICAL SAZONALMENTE SECA ANTE O REGIME PLUVIOMÉTRICO |
title |
RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FOREST |
spellingShingle |
RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FOREST Andrade, Eunice Maia de Caatinga. Semiárido. Regime pluviométrico. Profundidade efetiva. Caatinga. Semiarid. Rainfall regime. Effective depth. |
title_short |
RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FOREST |
title_full |
RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FOREST |
title_fullStr |
RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FOREST |
title_full_unstemmed |
RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FOREST |
title_sort |
RAINFALL REGIME ON FINE ROOT GROWTH IN A SEASONALLY DRY TROPICAL FOREST |
author |
Andrade, Eunice Maia de |
author_facet |
Andrade, Eunice Maia de Rosa, Gilberto Quevedo Almeida, Aldenia Mendes Mascena de Silva, Antonio Givanilson Rodrigues da Sena, Maria Gina Torres |
author_role |
author |
author2 |
Rosa, Gilberto Quevedo Almeida, Aldenia Mendes Mascena de Silva, Antonio Givanilson Rodrigues da Sena, Maria Gina Torres |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Andrade, Eunice Maia de Rosa, Gilberto Quevedo Almeida, Aldenia Mendes Mascena de Silva, Antonio Givanilson Rodrigues da Sena, Maria Gina Torres |
dc.subject.por.fl_str_mv |
Caatinga. Semiárido. Regime pluviométrico. Profundidade efetiva. Caatinga. Semiarid. Rainfall regime. Effective depth. |
topic |
Caatinga. Semiárido. Regime pluviométrico. Profundidade efetiva. Caatinga. Semiarid. Rainfall regime. Effective depth. |
description |
Seasonally dry tropical forests (SDTF) usually present dry seasons of eight or more months. Considering the concerns about the resilience of SDTF to climate changes, the objective of this study was to evaluate the effect of the rainfall regime on fine root growth in a SDTF. The experiment started at the end of the wet season (July 2015), when fine roots were evaluated and ingrowth cores were implemented. The temporal growth of fine roots in the 0-30 cm soil layer was monitored, considering the 0-10, 10-20, and 20-30 cm sublayers, through six samplings from November 2015 to July 2017. The characteristics evaluated were fine root biomass, fine root length, fine root specific length, and fine root mean diameter. The significances of the root growths over time and space were tested by the Kruskal-Wallis test (p<0.05). Fine roots (Ø<2 mm) were separated and dried in an oven (65 °C) until constant weight. The root length was determined using the Giaroots software. The fine root biomass in July 2015 was 7.7±5.0 Mg ha-1 and the length was 5.0±3.2 km m-2. Fine root growth in SDTF is strongly limited by dry periods, occurring decreases in biomass and length of fine roots in all layers evaluated. Fine root growth occurs predominantly in rainy seasons, with fast response of the root system to rainfall events, mainly in root length. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-05-22 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://periodicos.ufersa.edu.br/caatinga/article/view/8955 |
url |
https://periodicos.ufersa.edu.br/caatinga/article/view/8955 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://periodicos.ufersa.edu.br/caatinga/article/view/8955/10214 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2020 Revista Caatinga info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2020 Revista Caatinga |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido |
publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido |
dc.source.none.fl_str_mv |
REVISTA CAATINGA; Vol. 33 No. 2 (2020); 458-469 Revista Caatinga; v. 33 n. 2 (2020); 458-469 1983-2125 0100-316X reponame:Revista Caatinga instname:Universidade Federal Rural do Semi-Árido (UFERSA) instacron:UFERSA |
instname_str |
Universidade Federal Rural do Semi-Árido (UFERSA) |
instacron_str |
UFERSA |
institution |
UFERSA |
reponame_str |
Revista Caatinga |
collection |
Revista Caatinga |
repository.name.fl_str_mv |
Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA) |
repository.mail.fl_str_mv |
patricio@ufersa.edu.br|| caatinga@ufersa.edu.br |
_version_ |
1754734750238507008 |