Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Ciência Rural |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200202 |
Resumo: | ABSTRACT: The objectives of this study were to determine the rates of plant litter deposition and decomposition in Marandu pastures (Urochloa brizantha cv. Marandu) under a) three forms of nitrogen (N) supply, b) at different stages of rotational grazing and c) to compare the single-exponential decay constant (‘k’) derived from litterbags with values derived from estimates of deposited and existing litter (DEL technique). The three N supply treatments were: without or with N fertilization (zero or 150 kg N ha-1 yr-1) or with the legume Desmodium ovalifolium. There were no significant differences (p<0.05) between existing litter and rates of litter deposition and decomposition between the three N supply treatments. The litter decomposition rate was estimated using the DEL technique for the 7-day grazing periods and two subsequent 14-day periods in each 35-day grazing cycle. The litter decomposition rate was (P<0.05) higher for the second rest period (days 21 to 35) at 0.089 g g-1 day-1, than for the grazing period (0.038 g g-1 day-1) and for the first rest period (0.040 g g-1 day-1). The mean half-life of the litter was 12 days using the DEL technique while the estimate from the litterbags was 136 days. Results showed that estimates provided by litterbags severely underestimate the decomposition in relation to the DEL technique and predict a long-term accumulation of litter which is not observed. |
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Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazingUrochloa brizanthadecomposition constantmethodological comparisonABSTRACT: The objectives of this study were to determine the rates of plant litter deposition and decomposition in Marandu pastures (Urochloa brizantha cv. Marandu) under a) three forms of nitrogen (N) supply, b) at different stages of rotational grazing and c) to compare the single-exponential decay constant (‘k’) derived from litterbags with values derived from estimates of deposited and existing litter (DEL technique). The three N supply treatments were: without or with N fertilization (zero or 150 kg N ha-1 yr-1) or with the legume Desmodium ovalifolium. There were no significant differences (p<0.05) between existing litter and rates of litter deposition and decomposition between the three N supply treatments. The litter decomposition rate was estimated using the DEL technique for the 7-day grazing periods and two subsequent 14-day periods in each 35-day grazing cycle. The litter decomposition rate was (P<0.05) higher for the second rest period (days 21 to 35) at 0.089 g g-1 day-1, than for the grazing period (0.038 g g-1 day-1) and for the first rest period (0.040 g g-1 day-1). The mean half-life of the litter was 12 days using the DEL technique while the estimate from the litterbags was 136 days. Results showed that estimates provided by litterbags severely underestimate the decomposition in relation to the DEL technique and predict a long-term accumulation of litter which is not observed.Universidade Federal de Santa Maria2019-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200202Ciência Rural v.49 n.12 2019reponame:Ciência Ruralinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM10.1590/0103-8478cr20190266info:eu-repo/semantics/openAccessRamalho,Israel OliveiraRezende,Claudia de PaulaPereira,José MarquesMacedo,Robert de OliveiraSantos,Camila Almeida dosMonteiro,Rafael CassadorAlves,Bruno José RodriguesCarvalho,Isabel das Neves Oiticica deUrquiaga,SegundoBoddey,Robert Michaeleng2019-11-28T00:00:00ZRevista |
dc.title.none.fl_str_mv |
Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing |
title |
Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing |
spellingShingle |
Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing Ramalho,Israel Oliveira Urochloa brizantha decomposition constant methodological comparison |
title_short |
Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing |
title_full |
Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing |
title_fullStr |
Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing |
title_full_unstemmed |
Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing |
title_sort |
Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing |
author |
Ramalho,Israel Oliveira |
author_facet |
Ramalho,Israel Oliveira Rezende,Claudia de Paula Pereira,José Marques Macedo,Robert de Oliveira Santos,Camila Almeida dos Monteiro,Rafael Cassador Alves,Bruno José Rodrigues Carvalho,Isabel das Neves Oiticica de Urquiaga,Segundo Boddey,Robert Michael |
author_role |
author |
author2 |
Rezende,Claudia de Paula Pereira,José Marques Macedo,Robert de Oliveira Santos,Camila Almeida dos Monteiro,Rafael Cassador Alves,Bruno José Rodrigues Carvalho,Isabel das Neves Oiticica de Urquiaga,Segundo Boddey,Robert Michael |
author2_role |
author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Ramalho,Israel Oliveira Rezende,Claudia de Paula Pereira,José Marques Macedo,Robert de Oliveira Santos,Camila Almeida dos Monteiro,Rafael Cassador Alves,Bruno José Rodrigues Carvalho,Isabel das Neves Oiticica de Urquiaga,Segundo Boddey,Robert Michael |
dc.subject.por.fl_str_mv |
Urochloa brizantha decomposition constant methodological comparison |
topic |
Urochloa brizantha decomposition constant methodological comparison |
description |
ABSTRACT: The objectives of this study were to determine the rates of plant litter deposition and decomposition in Marandu pastures (Urochloa brizantha cv. Marandu) under a) three forms of nitrogen (N) supply, b) at different stages of rotational grazing and c) to compare the single-exponential decay constant (‘k’) derived from litterbags with values derived from estimates of deposited and existing litter (DEL technique). The three N supply treatments were: without or with N fertilization (zero or 150 kg N ha-1 yr-1) or with the legume Desmodium ovalifolium. There were no significant differences (p<0.05) between existing litter and rates of litter deposition and decomposition between the three N supply treatments. The litter decomposition rate was estimated using the DEL technique for the 7-day grazing periods and two subsequent 14-day periods in each 35-day grazing cycle. The litter decomposition rate was (P<0.05) higher for the second rest period (days 21 to 35) at 0.089 g g-1 day-1, than for the grazing period (0.038 g g-1 day-1) and for the first rest period (0.040 g g-1 day-1). The mean half-life of the litter was 12 days using the DEL technique while the estimate from the litterbags was 136 days. Results showed that estimates provided by litterbags severely underestimate the decomposition in relation to the DEL technique and predict a long-term accumulation of litter which is not observed. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-01-01 |
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=S0103-84782019001200202 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200202 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/0103-8478cr20190266 |
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 |
Universidade Federal de Santa Maria |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
dc.source.none.fl_str_mv |
Ciência Rural v.49 n.12 2019 reponame:Ciência Rural instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Ciência Rural |
collection |
Ciência Rural |
repository.name.fl_str_mv |
|
repository.mail.fl_str_mv |
|
_version_ |
1749140554307862528 |