Grazing effect on NDVI across an aridity gradient in Argentina

Grazing effects on aboveground net primary production (ANPP) have ever been controversial. Certain plant communities are very sensitive to grazing and others are not. We analyzed the grazing effect on ANPP across a gradient of mean annual precipitation (MAP) in rangelands of Central Argentina. We fo...

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Detalles Bibliográficos
Publicado: 2008
Materias:
Aboveground net primary production
Grazing disturbances
Normalized Difference Vegetation Index (NDVI)
Rangelands
aboveground production
annual variation
aridity
AVHRR
grazing management
NDVI
net primary production
NOAA satellite
plant community
precipitation intensity
rangeland
regional pattern
watering point
Argentina
Chaco [Argentina]
South America
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01401963_v72_n5_p764_Blanco
http://hdl.handle.net/20.500.12110/paper_01401963_v72_n5_p764_Blanco
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01401963_v72_n5_p764_Blanco
record_format dspace
spelling paper:paper_01401963_v72_n5_p764_Blanco2023-06-08T15:11:02Z Grazing effect on NDVI across an aridity gradient in Argentina Aboveground net primary production Grazing disturbances Normalized Difference Vegetation Index (NDVI) Rangelands aboveground production annual variation aridity AVHRR grazing management NDVI net primary production NOAA satellite plant community precipitation intensity rangeland regional pattern watering point Argentina Chaco [Argentina] South America Grazing effects on aboveground net primary production (ANPP) have ever been controversial. Certain plant communities are very sensitive to grazing and others are not. We analyzed the grazing effect on ANPP across a gradient of mean annual precipitation (MAP) in rangelands of Central Argentina. We focused not only on the regional patterns of the grazing effect on ANPP but also on the response of the inter-annual variability of ANPP to this disturbance. We used the seasonal dynamics of the Normalized Difference Vegetation Index (NDVI), a spectral index calculated from the reflectance in the red and infrared portion of the spectrum as recorded by the AVHRR/NOAA sensor as an estimator of ANPP. This variable was recorded at increasing distances from the watering point in large paddock distributed through the MAP gradient (250-600 mm) of the extensive plains Arid Chaco in Argentina. Grazing effect on NDVI decreased along the regional gradient of MAP. The grazing effect on NDVI varied among years, being greater in dry than in wet years. Regional patterns changed among years because the NDVI close to the watering points had high inter-annual variability at the driest extreme of the gradient. Our findings contribute a conceptual framework to grazing management in semi-arid rangeland. Considering that grazing effect on NDVI-I was higher in arid than in wet sites implicates that appropriate grazing management strategies would be different in sites with different precipitation levels. © 2007 Elsevier Ltd. All rights reserved. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01401963_v72_n5_p764_Blanco http://hdl.handle.net/20.500.12110/paper_01401963_v72_n5_p764_Blanco
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Aboveground net primary production
Grazing disturbances
Normalized Difference Vegetation Index (NDVI)
Rangelands
aboveground production
annual variation
aridity
AVHRR
grazing management
NDVI
net primary production
NOAA satellite
plant community
precipitation intensity
rangeland
regional pattern
watering point
Argentina
Chaco [Argentina]
South America
spellingShingle Aboveground net primary production
Grazing disturbances
Normalized Difference Vegetation Index (NDVI)
Rangelands
aboveground production
annual variation
aridity
AVHRR
grazing management
NDVI
net primary production
NOAA satellite
plant community
precipitation intensity
rangeland
regional pattern
watering point
Argentina
Chaco [Argentina]
South America
Grazing effect on NDVI across an aridity gradient in Argentina
topic_facet Aboveground net primary production
Grazing disturbances
Normalized Difference Vegetation Index (NDVI)
Rangelands
aboveground production
annual variation
aridity
AVHRR
grazing management
NDVI
net primary production
NOAA satellite
plant community
precipitation intensity
rangeland
regional pattern
watering point
Argentina
Chaco [Argentina]
South America
description Grazing effects on aboveground net primary production (ANPP) have ever been controversial. Certain plant communities are very sensitive to grazing and others are not. We analyzed the grazing effect on ANPP across a gradient of mean annual precipitation (MAP) in rangelands of Central Argentina. We focused not only on the regional patterns of the grazing effect on ANPP but also on the response of the inter-annual variability of ANPP to this disturbance. We used the seasonal dynamics of the Normalized Difference Vegetation Index (NDVI), a spectral index calculated from the reflectance in the red and infrared portion of the spectrum as recorded by the AVHRR/NOAA sensor as an estimator of ANPP. This variable was recorded at increasing distances from the watering point in large paddock distributed through the MAP gradient (250-600 mm) of the extensive plains Arid Chaco in Argentina. Grazing effect on NDVI decreased along the regional gradient of MAP. The grazing effect on NDVI varied among years, being greater in dry than in wet years. Regional patterns changed among years because the NDVI close to the watering points had high inter-annual variability at the driest extreme of the gradient. Our findings contribute a conceptual framework to grazing management in semi-arid rangeland. Considering that grazing effect on NDVI-I was higher in arid than in wet sites implicates that appropriate grazing management strategies would be different in sites with different precipitation levels. © 2007 Elsevier Ltd. All rights reserved.
title Grazing effect on NDVI across an aridity gradient in Argentina
title_short Grazing effect on NDVI across an aridity gradient in Argentina
title_full Grazing effect on NDVI across an aridity gradient in Argentina
title_fullStr Grazing effect on NDVI across an aridity gradient in Argentina
title_full_unstemmed Grazing effect on NDVI across an aridity gradient in Argentina
title_sort grazing effect on ndvi across an aridity gradient in argentina
publishDate 2008
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01401963_v72_n5_p764_Blanco
http://hdl.handle.net/20.500.12110/paper_01401963_v72_n5_p764_Blanco
_version_ 1768544724922138624

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