Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks

Autores
Herrera, Lorena Paola; Texeira González, Marcos Alexis; Paruelo, José
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Questions: How do fragment-level characteristics affect remnant grassland functioning in a highly transformed landscape? Are artificial neural networks (ANNs) a better statistical tool to model variations in grassland functioning compared to linear regression models (LRMs)? Location: Tandilia Range, Southern Pampa, Buenos Aires Province, Argentina. Methods: We characterized the dynamics of the vegetation functioning in 60 remnant grasslands by means of the Enhanced Vegetation Index (EVI) data provided by MODIS/Terra images from July 2000 to June 2005. First, we performed a principal component analysis on the fragments mean monthly values of EVI in order to obtain synthetic measures (i.e. the PCA axes) of grassland functioning. Grassland fragments were also characterized by their size, vegetation structure (abundance of the tall-tussock grass Paspalum quadrifarium), and physical environment (soil type -abundance of litholitic soils-, elevation, aspect and slope). The relationship between grassland functioning and these explanatory variables was explored by means of linear regression models (LRMs) and artificial neural networks (ANNs). Results: The first and second PCA axes were related to the annual integral of EVI (EVI-I) and EVI seasonality (EVI-S), respectively; and explained jointly approximately 80% of total variability in mean EVI values. ANNs captured better than regression models the relationships among the proposed controls and the spatial variability of grassland functioning in Southern Pampa. Results showed EVI-I variability was related to all independent variables except aspect. While fragment-size, litholitic soils and slope were negatively related to EVI-I, the abundance of P. quadrifarium showed a positive effect on the spectral index. Grasslands with high seasonality were large, and had high slope and aspect, low abundance of P. quadrifarium and more abundance of litholitic soils. Conclusions: Our results showed that grassland functioning in Southern Pampa, as estimated by EVI, depends on fragment-size, vegetation structure and physical factors (soil type, aspect and slope). Paspalum quadrifarium may be performing an important functional role in this grassland system.
Fil: Herrera, Lorena Paola. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias. Departamento de Producción Vegetal; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires. Estación Experimental Agropecuaria Balcarce; Argentina
Fil: Texeira González, Marcos Alexis.
Fil: Paruelo, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina
Materia
Enhanced Vegetation Index
Fragmentation
Landscape Structure
Modis Data
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/7547

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network_name_str CONICET Digital (CONICET)
spelling Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networksHerrera, Lorena PaolaTexeira González, Marcos AlexisParuelo, JoséEnhanced Vegetation IndexFragmentationLandscape StructureModis Datahttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Questions: How do fragment-level characteristics affect remnant grassland functioning in a highly transformed landscape? Are artificial neural networks (ANNs) a better statistical tool to model variations in grassland functioning compared to linear regression models (LRMs)? Location: Tandilia Range, Southern Pampa, Buenos Aires Province, Argentina. Methods: We characterized the dynamics of the vegetation functioning in 60 remnant grasslands by means of the Enhanced Vegetation Index (EVI) data provided by MODIS/Terra images from July 2000 to June 2005. First, we performed a principal component analysis on the fragments mean monthly values of EVI in order to obtain synthetic measures (i.e. the PCA axes) of grassland functioning. Grassland fragments were also characterized by their size, vegetation structure (abundance of the tall-tussock grass Paspalum quadrifarium), and physical environment (soil type -abundance of litholitic soils-, elevation, aspect and slope). The relationship between grassland functioning and these explanatory variables was explored by means of linear regression models (LRMs) and artificial neural networks (ANNs). Results: The first and second PCA axes were related to the annual integral of EVI (EVI-I) and EVI seasonality (EVI-S), respectively; and explained jointly approximately 80% of total variability in mean EVI values. ANNs captured better than regression models the relationships among the proposed controls and the spatial variability of grassland functioning in Southern Pampa. Results showed EVI-I variability was related to all independent variables except aspect. While fragment-size, litholitic soils and slope were negatively related to EVI-I, the abundance of P. quadrifarium showed a positive effect on the spectral index. Grasslands with high seasonality were large, and had high slope and aspect, low abundance of P. quadrifarium and more abundance of litholitic soils. Conclusions: Our results showed that grassland functioning in Southern Pampa, as estimated by EVI, depends on fragment-size, vegetation structure and physical factors (soil type, aspect and slope). Paspalum quadrifarium may be performing an important functional role in this grassland system.Fil: Herrera, Lorena Paola. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias. Departamento de Producción Vegetal; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires. Estación Experimental Agropecuaria Balcarce; ArgentinaFil: Texeira González, Marcos Alexis.Fil: Paruelo, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; ArgentinaWiley2013-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/7547Herrera, Lorena Paola; Texeira González, Marcos Alexis; Paruelo, José; Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks; Wiley; Applied Vegetation Science; 16; 3; 7-2013; 426-4371402-2001enginfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/avsc.12009/abstractinfo:eu-repo/semantics/altIdentifier/doi/10.1111/avsc.12009info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:38:33Zoai:ri.conicet.gov.ar:11336/7547instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:38:33.595CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks
title Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks
spellingShingle Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks
Herrera, Lorena Paola
Enhanced Vegetation Index
Fragmentation
Landscape Structure
Modis Data
title_short Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks
title_full Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks
title_fullStr Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks
title_full_unstemmed Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks
title_sort Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks
dc.creator.none.fl_str_mv Herrera, Lorena Paola
Texeira González, Marcos Alexis
Paruelo, José
author Herrera, Lorena Paola
author_facet Herrera, Lorena Paola
Texeira González, Marcos Alexis
Paruelo, José
author_role author
author2 Texeira González, Marcos Alexis
Paruelo, José
author2_role author
author
dc.subject.none.fl_str_mv Enhanced Vegetation Index
Fragmentation
Landscape Structure
Modis Data
topic Enhanced Vegetation Index
Fragmentation
Landscape Structure
Modis Data
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Questions: How do fragment-level characteristics affect remnant grassland functioning in a highly transformed landscape? Are artificial neural networks (ANNs) a better statistical tool to model variations in grassland functioning compared to linear regression models (LRMs)? Location: Tandilia Range, Southern Pampa, Buenos Aires Province, Argentina. Methods: We characterized the dynamics of the vegetation functioning in 60 remnant grasslands by means of the Enhanced Vegetation Index (EVI) data provided by MODIS/Terra images from July 2000 to June 2005. First, we performed a principal component analysis on the fragments mean monthly values of EVI in order to obtain synthetic measures (i.e. the PCA axes) of grassland functioning. Grassland fragments were also characterized by their size, vegetation structure (abundance of the tall-tussock grass Paspalum quadrifarium), and physical environment (soil type -abundance of litholitic soils-, elevation, aspect and slope). The relationship between grassland functioning and these explanatory variables was explored by means of linear regression models (LRMs) and artificial neural networks (ANNs). Results: The first and second PCA axes were related to the annual integral of EVI (EVI-I) and EVI seasonality (EVI-S), respectively; and explained jointly approximately 80% of total variability in mean EVI values. ANNs captured better than regression models the relationships among the proposed controls and the spatial variability of grassland functioning in Southern Pampa. Results showed EVI-I variability was related to all independent variables except aspect. While fragment-size, litholitic soils and slope were negatively related to EVI-I, the abundance of P. quadrifarium showed a positive effect on the spectral index. Grasslands with high seasonality were large, and had high slope and aspect, low abundance of P. quadrifarium and more abundance of litholitic soils. Conclusions: Our results showed that grassland functioning in Southern Pampa, as estimated by EVI, depends on fragment-size, vegetation structure and physical factors (soil type, aspect and slope). Paspalum quadrifarium may be performing an important functional role in this grassland system.
Fil: Herrera, Lorena Paola. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias. Departamento de Producción Vegetal; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires. Estación Experimental Agropecuaria Balcarce; Argentina
Fil: Texeira González, Marcos Alexis.
Fil: Paruelo, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina
description Questions: How do fragment-level characteristics affect remnant grassland functioning in a highly transformed landscape? Are artificial neural networks (ANNs) a better statistical tool to model variations in grassland functioning compared to linear regression models (LRMs)? Location: Tandilia Range, Southern Pampa, Buenos Aires Province, Argentina. Methods: We characterized the dynamics of the vegetation functioning in 60 remnant grasslands by means of the Enhanced Vegetation Index (EVI) data provided by MODIS/Terra images from July 2000 to June 2005. First, we performed a principal component analysis on the fragments mean monthly values of EVI in order to obtain synthetic measures (i.e. the PCA axes) of grassland functioning. Grassland fragments were also characterized by their size, vegetation structure (abundance of the tall-tussock grass Paspalum quadrifarium), and physical environment (soil type -abundance of litholitic soils-, elevation, aspect and slope). The relationship between grassland functioning and these explanatory variables was explored by means of linear regression models (LRMs) and artificial neural networks (ANNs). Results: The first and second PCA axes were related to the annual integral of EVI (EVI-I) and EVI seasonality (EVI-S), respectively; and explained jointly approximately 80% of total variability in mean EVI values. ANNs captured better than regression models the relationships among the proposed controls and the spatial variability of grassland functioning in Southern Pampa. Results showed EVI-I variability was related to all independent variables except aspect. While fragment-size, litholitic soils and slope were negatively related to EVI-I, the abundance of P. quadrifarium showed a positive effect on the spectral index. Grasslands with high seasonality were large, and had high slope and aspect, low abundance of P. quadrifarium and more abundance of litholitic soils. Conclusions: Our results showed that grassland functioning in Southern Pampa, as estimated by EVI, depends on fragment-size, vegetation structure and physical factors (soil type, aspect and slope). Paspalum quadrifarium may be performing an important functional role in this grassland system.
publishDate 2013
dc.date.none.fl_str_mv 2013-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/7547
Herrera, Lorena Paola; Texeira González, Marcos Alexis; Paruelo, José; Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks; Wiley; Applied Vegetation Science; 16; 3; 7-2013; 426-437
1402-2001
url http://hdl.handle.net/11336/7547
identifier_str_mv Herrera, Lorena Paola; Texeira González, Marcos Alexis; Paruelo, José; Fragment size, vegetation structure and physical environment control grassland functioning: a test based on artificial neural networks; Wiley; Applied Vegetation Science; 16; 3; 7-2013; 426-437
1402-2001
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/avsc.12009/abstract
info:eu-repo/semantics/altIdentifier/doi/10.1111/avsc.12009
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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