More stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate

In the Neotropics the predominant pathway to intensify productivity is generally thought to be to convert grasslands to sown pastures, mostly in monoculture. This article examines how above-ground net primary productivity (ANPP) in seminatural grasslands and sown pastures in Central America respon...

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Autores principales:	Ospina, Sonia, Rusch, Graciela M., Pezo Quevedo, Danilo, Casanoves, Fernando, Sinclair, Fergus L.
Formato:	Artículo
Lenguaje:	Inglés
Publicado:	2015
Acceso en línea:	https://repositorio.catie.ac.cr/handle/11554/7870

id	RepoCATIE7870
record_format	dspace
spelling	RepoCATIE78702021-12-22T19:22:56Z More stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate Ospina, Sonia Rusch, Graciela M. Pezo Quevedo, Danilo Casanoves, Fernando Sinclair, Fergus L. In the Neotropics the predominant pathway to intensify productivity is generally thought to be to convert grasslands to sown pastures, mostly in monoculture. This article examines how above-ground net primary productivity (ANPP) in seminatural grasslands and sown pastures in Central America respond to rainfall by: (i) assessing the relationships between ANPP and accumulated rainfall and indices of rainfall distribution, (ii) evaluating the variability of ANPP between and within seasons, and (iii) estimating the temporal stability of ANPP. We conducted sequential biomass harvests during 12 periods of 22 days and related those to rainfall. There were significant relationships between ANPP and cumulative rainfall in 22-day periods for both vegetation types and a model including a linear and quadratic term explained 74% of the variation in the data. There was also a significant correlation between ANPP and the number of rainfall events for both vegetation types. Sown pastures had higher ANPP increments per unit rainfall and higher ANPP at the peak of the rainy season than seminatural grasslands. In contrast, semi-natural grasslands showed higher ANPP early in the dry season. The temporal stability of ANPP was higher in semi-natural grasslands than in the sown pastures in the dry season and over a whole annual cycle. Our results reveal that, contrary to conventional thinking amongst pasture scientists, there appears to be no increase in ANPP arising from replacing semi-natural grasslands with sown pastures under prevailing pasture management practices in seasonally dry climates, while the temporal distribution of ANPP is more even in semi-natural grasslands. Neither sown pastures nor semi-natural grasslands are productive towards the end of the dry season, indicating the potential importance Centro Agronómico Tropical de Investigación y Enseñanza (CATIE) - MAP 2015-11-18T06:02:21Z 2015-11-18T06:02:21Z 2015-01-27 Artículo https://repositorio.catie.ac.cr/handle/11554/7870 en Programa Agroambiental Mesoamericano (MAP). Fase I application/pdf
institution	Centro Agronómico Tropical de Investigación y Enseñanza
collection	Repositorio CATIE
language	Inglés
description	In the Neotropics the predominant pathway to intensify productivity is generally thought to be to convert grasslands to sown pastures, mostly in monoculture. This article examines how above-ground net primary productivity (ANPP) in seminatural grasslands and sown pastures in Central America respond to rainfall by: (i) assessing the relationships between ANPP and accumulated rainfall and indices of rainfall distribution, (ii) evaluating the variability of ANPP between and within seasons, and (iii) estimating the temporal stability of ANPP. We conducted sequential biomass harvests during 12 periods of 22 days and related those to rainfall. There were significant relationships between ANPP and cumulative rainfall in 22-day periods for both vegetation types and a model including a linear and quadratic term explained 74% of the variation in the data. There was also a significant correlation between ANPP and the number of rainfall events for both vegetation types. Sown pastures had higher ANPP increments per unit rainfall and higher ANPP at the peak of the rainy season than seminatural grasslands. In contrast, semi-natural grasslands showed higher ANPP early in the dry season. The temporal stability of ANPP was higher in semi-natural grasslands than in the sown pastures in the dry season and over a whole annual cycle. Our results reveal that, contrary to conventional thinking amongst pasture scientists, there appears to be no increase in ANPP arising from replacing semi-natural grasslands with sown pastures under prevailing pasture management practices in seasonally dry climates, while the temporal distribution of ANPP is more even in semi-natural grasslands. Neither sown pastures nor semi-natural grasslands are productive towards the end of the dry season, indicating the potential importance
format	Artículo
author	Ospina, Sonia Rusch, Graciela M. Pezo Quevedo, Danilo Casanoves, Fernando Sinclair, Fergus L.
spellingShingle	Ospina, Sonia Rusch, Graciela M. Pezo Quevedo, Danilo Casanoves, Fernando Sinclair, Fergus L. More stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate
author_facet	Ospina, Sonia Rusch, Graciela M. Pezo Quevedo, Danilo Casanoves, Fernando Sinclair, Fergus L.
author_sort	Ospina, Sonia
title	More stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate
title_short	More stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate
title_full	More stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate
title_fullStr	More stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate
title_full_unstemmed	More stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate
title_sort	more stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate
publishDate	2015
url	https://repositorio.catie.ac.cr/handle/11554/7870
work_keys_str_mv	AT ospinasonia morestableproductivityofseminaturalgrasslandsthansownpasturesinaseasonallydryclimate AT ruschgracielam morestableproductivityofseminaturalgrasslandsthansownpasturesinaseasonallydryclimate AT pezoquevedodanilo morestableproductivityofseminaturalgrasslandsthansownpasturesinaseasonallydryclimate AT casanovesfernando morestableproductivityofseminaturalgrasslandsthansownpasturesinaseasonallydryclimate AT sinclairfergusl morestableproductivityofseminaturalgrasslandsthansownpasturesinaseasonallydryclimate
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More stable productivity of semi natural grasslands than sown pastures in a seasonally dry climate

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