Spatial structure of remnants of native forest in the Dry Chaco and the Espinal

Spatial structure of remnants of native forest in the Dry Chaco and the Espinal

The vast territory of the Dry Chaco and the Espinal became one of the global centers for the production of grains and meat. Due to different legal norms, productive limitations or cultural causes, the native forest is preserved on extensive patches as well as on numerous small fragments within the agricultural matrix. These remnants are seldom considered by the scientifc community and decision-makers, and are left out of territorial planning and conservation actions. In this paper, we describe the spatial structure of the remnants and generate a classifcation scheme that allows identifying different types according to their spatial properties. Following an object-based classifcation strategy, we mapped ~22000 remnants in eight foci areas (FA) scattered throughout the territory using CBERS-2B satellite images. By means of spatial metrics, these remnants of variable sizes, shapes and isolation levels were categorized into fve classes, from "islets" to "compact blocks". The surface of remnants was higher in the Dry Chaco than in the Espinal (between 10.1% and 19.4% in the frst region, and between 3.1% and 7.3% in the second). Differences in the level of fragmentation were amplifed between FA, depending both on the total surface of remnants and on the relative occurrence of different types. Thus, in the FA of San Luis the fragmentation was 70 times higher than in the FA of Anta (Salta). In this work, we provide tools for the identifcation and monitoring of these remnants, which may be considered for both productive and conservation purposes. Finally, management and conservation actions must recognize the existence of these pieces of forest in landscapes highly transformed by agricultural activity.https://doi.org/10.25260/EA.18.28.3.0.767

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Main Authors: Muñoz Garachana, Diego, Aragón, Roxana, Baldi, Germán
Format: Digital revista
Language:spa
Published: Asociación Argentina de Ecología 2018
Online Access:https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/767
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id rev-ecoaus-article-767
record_format ojs
institution AUSTRAL
collection OJS
country Argentina
countrycode AR
component Revista
access En linea
databasecode rev-ecoaus
tag revista
region America del Sur
libraryname Asociación Argentina de Ecología
language spa
format Digital
author Muñoz Garachana, Diego
Aragón, Roxana
Baldi, Germán
spellingShingle Muñoz Garachana, Diego
Aragón, Roxana
Baldi, Germán
Spatial structure of remnants of native forest in the Dry Chaco and the Espinal
author_facet Muñoz Garachana, Diego
Aragón, Roxana
Baldi, Germán
author_sort Muñoz Garachana, Diego
title Spatial structure of remnants of native forest in the Dry Chaco and the Espinal
title_short Spatial structure of remnants of native forest in the Dry Chaco and the Espinal
title_full Spatial structure of remnants of native forest in the Dry Chaco and the Espinal
title_fullStr Spatial structure of remnants of native forest in the Dry Chaco and the Espinal
title_full_unstemmed Spatial structure of remnants of native forest in the Dry Chaco and the Espinal
title_sort spatial structure of remnants of native forest in the dry chaco and the espinal
description The vast territory of the Dry Chaco and the Espinal became one of the global centers for the production of grains and meat. Due to different legal norms, productive limitations or cultural causes, the native forest is preserved on extensive patches as well as on numerous small fragments within the agricultural matrix. These remnants are seldom considered by the scientifc community and decision-makers, and are left out of territorial planning and conservation actions. In this paper, we describe the spatial structure of the remnants and generate a classifcation scheme that allows identifying different types according to their spatial properties. Following an object-based classifcation strategy, we mapped ~22000 remnants in eight foci areas (FA) scattered throughout the territory using CBERS-2B satellite images. By means of spatial metrics, these remnants of variable sizes, shapes and isolation levels were categorized into fve classes, from "islets" to "compact blocks". The surface of remnants was higher in the Dry Chaco than in the Espinal (between 10.1% and 19.4% in the frst region, and between 3.1% and 7.3% in the second). Differences in the level of fragmentation were amplifed between FA, depending both on the total surface of remnants and on the relative occurrence of different types. Thus, in the FA of San Luis the fragmentation was 70 times higher than in the FA of Anta (Salta). In this work, we provide tools for the identifcation and monitoring of these remnants, which may be considered for both productive and conservation purposes. Finally, management and conservation actions must recognize the existence of these pieces of forest in landscapes highly transformed by agricultural activity.https://doi.org/10.25260/EA.18.28.3.0.767
publisher Asociación Argentina de Ecología
publishDate 2018
url https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/767
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AT aragonroxana spatialstructureofremnantsofnativeforestinthedrychacoandtheespinal
AT baldigerman spatialstructureofremnantsofnativeforestinthedrychacoandtheespinal
AT munozgarachanadiego estructuraespacialderemanentesdebosquenativoenelchacosecoyelespinal
AT aragonroxana estructuraespacialderemanentesdebosquenativoenelchacosecoyelespinal
AT baldigerman estructuraespacialderemanentesdebosquenativoenelchacosecoyelespinal
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spelling rev-ecoaus-article-7672023-11-02T19:54:54Z Spatial structure of remnants of native forest in the Dry Chaco and the Espinal Estructura espacial de remanentes de bosque nativo en el Chaco Seco y el Espinal Muñoz Garachana, Diego Aragón, Roxana Baldi, Germán The vast territory of the Dry Chaco and the Espinal became one of the global centers for the production of grains and meat. Due to different legal norms, productive limitations or cultural causes, the native forest is preserved on extensive patches as well as on numerous small fragments within the agricultural matrix. These remnants are seldom considered by the scientifc community and decision-makers, and are left out of territorial planning and conservation actions. In this paper, we describe the spatial structure of the remnants and generate a classifcation scheme that allows identifying different types according to their spatial properties. Following an object-based classifcation strategy, we mapped ~22000 remnants in eight foci areas (FA) scattered throughout the territory using CBERS-2B satellite images. By means of spatial metrics, these remnants of variable sizes, shapes and isolation levels were categorized into fve classes, from "islets" to "compact blocks". The surface of remnants was higher in the Dry Chaco than in the Espinal (between 10.1% and 19.4% in the frst region, and between 3.1% and 7.3% in the second). Differences in the level of fragmentation were amplifed between FA, depending both on the total surface of remnants and on the relative occurrence of different types. Thus, in the FA of San Luis the fragmentation was 70 times higher than in the FA of Anta (Salta). In this work, we provide tools for the identifcation and monitoring of these remnants, which may be considered for both productive and conservation purposes. Finally, management and conservation actions must recognize the existence of these pieces of forest in landscapes highly transformed by agricultural activity.https://doi.org/10.25260/EA.18.28.3.0.767 El vasto territorio del Chaco Seco y el Espinal se consolida como uno de los centros globales de producción de granos y carne. Tanto por distintas normas legales y limitaciones productivas, como por causas culturales, el bosque nativo se preserva en grandes porciones y numerosos pequeños fragmentos inmersos en la matriz agrícola. Estos remanentes suelen pasar desapercibidos para la comunidad científca y para los tomadores de decisiones, y quedan al margen de la planifcación territorial y de acciones de conservación. En este trabajo describimos la estructura espacial de los remanentes y generamos un esquema de clasifcación que permite identifcar distintos tipos según sus propiedades espaciales. Por medio de una estrategia de clasifcación basada en objetos, cartografamos ~22000 remanentes en ocho áreas focales (AF) dispersas en el territorio, para lo cual usamos imágenes satelitales CBERS-2B. Mediante índices espaciales, estos remanentes de tamaños, formas y niveles de aislamiento variables fueron categorizados en cinco clases, desde "isletas" hasta "bloques compactos". La superfcie de remanentes resultó mayor en el Chaco Seco que en el Espinal (entre 10.1% y 19.4% en la primera región, y entre 3.1% y 7.3% en la segunda). Las diferencias en el nivel de fragmentación se amplifcaron entre AF, dependiendo tanto de la superfcie total de remanentes como de la ocurrencia relativa de distintos tipos. Así, en el AF de San Luis, la fragmentación resultó 70 veces superior a la del AF de Anta (Salta). En este trabajo brindamos herramientas para identifcar y monitorear estos remanentes; estas herramientas podrán ser consideradas tanto con fnes productivos como de conservación. Finalmente, las acciones de manejo y conservación deben reconocer la existencia de estos fragmentos de bosques en paisajes muy transformados por la actividad agropecuaria.https://doi.org/10.25260/EA.18.28.3.0.767 Asociación Argentina de Ecología 2018-10-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articles Artículos application/pdf https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/767 10.25260/EA.18.28.3.0.767 Ecología Austral; Vol. 28 No. 3 (2018): December 2018. Pages 480-607; 553-564 Ecología Austral; Vol. 28 Núm. 3 (2018): December 2018. Pages 480-607; 553-564 1667-782X 0327-5477 spa https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/767/344 Derechos de autor 2018 Diego Muñoz Garachana, Roxana Aragón, Germán Baldi https://creativecommons.org/licenses/by/3.0/

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