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Landscape change in tidal floodplains near the mouth of the Amazon River

Identifieur interne : 000D86 ( Istex/Corpus ); précédent : 000D85; suivant : 000D87

Landscape change in tidal floodplains near the mouth of the Amazon River

Auteurs : Daniel J. Zarin ; Valeria F. G Pereira ; Hugh Raffles ; Fernando G. Rabelo ; Miguel Pinedo-Vasquez ; Russell G. Congalton

Source :

RBID : ISTEX:F1631CF13FE1A19ACD6D870E3FD84A66CB4BB0FD

English descriptors

Abstract

Recent analyses of human impacts on Amazonian landscapes have focused primarily on upland forests that have been deforested as roads have penetrated the frontier. In contrast, relatively little priority has been given to documenting and understanding landscape changes in the roughly 400000km2 of Amazônia’s floodplains, where an extensive network of waterways has long provided the transportation infrastructure. Amazonian floodplains generally support higher rural population densities than the uplands and provide critical habitat and food for fish and shrimp species, a principal source of protein for millions of rural and urban Amazonians. We examined cover type changes in a 52304ha tidal floodplain near the mouth of the Amazon River in Amapá, Brazil (tidalrange=2–3m). We found five major cover types discernible in both black-and-white infrared aerial photographs taken in October–November 1976, and Landsat Thematic Mapper (TM) data from November 1991. The cover types were: (1) water and unvegetated banks, (2) herbaceous cover, both natural and agricultural, (3) early regrowth or degraded forest, (4) palm forest, and (5) mixed species várzea forest. From 1976 to 1991, the areal extent of the aquatic, herbaceous, early regrowth and degraded forest, and palm forest cover types increased from 2833 to 3406, 10708 to 15074, 3842 to 5446, and 1250 to 3208ha, respectively, while the areal extent of the mixed species várzea forest decreased from 33671 to 25170ha. Logging, heart-of-palm extraction and agricultural conversion are interacting disturbances which, combined with the rapid regrowth that occurs in the tidal floodplains of Amazônia, have produced a landscape characterized by a high rate of cover type transitions and a substantial loss of the mixed species várzea forest. The annualized forest conversion rate is comparable to that reported elsewhere for upland Amazonian landscapes.

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DOI: 10.1016/S0378-1127(01)00510-2

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ISTEX:F1631CF13FE1A19ACD6D870E3FD84A66CB4BB0FD

Le document en format XML

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<note type="content">Fig. 1: Study area location: (a) the state of Amapá is shown in gray; (b) the study area is shown in black.</note>
<note type="content">Fig. 2: The major cover types in the study area.</note>
<note type="content">Fig. 3: Vegetation cover maps of the study area. Cover types are color-coded as follows: AQUA, blue; HERB, pink; REGR, orange; PALM, dark green; VARZ, light green; clouds cover, white. (a) Classification based on visual interpretation of 1976 black-and-white infrared aerial photographs, (b) unsupervised classification of 1991 Landsat TM data with 5×5 majority filter applied to HERB, REGR, PALM and VARZ.</note>
<note type="content">Fig. 4: Spatial extent of the major cover types in 1976 and 1991.</note>
<note type="content">Fig. 5: Transition dynamics for várzea forest, 1976–1991.</note>
<note type="content">Fig. 6: Cover type transitions and the processes which cause them to occur.</note>
<note type="content">Table 1: Error matrix for unsupervised classification of cover types subject to inundation in a Landsat image of the study area recorded on 18 November 1991. Italicface type is used to highlight the number of accuracy assessment sites given identical cover type designations in the field and image classifications</note>
<note type="content">Table 2: Transition matrix for land-cover changes from 1976 to 1991 for the study area. All data are in hectares and are derived from Fig. 3. Italicface type is used to highlight the number of hectares given identical cover type designations in the 1976 and 1991 cover maps</note>
<note type="content">Table 3: Annualized rates of forest conversion from study sites in the Brazilian Amazon</note>
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<ce:title>Landscape change in tidal floodplains near the mouth of the Amazon River</ce:title>
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<ce:given-name>Daniel J</ce:given-name>
<ce:surname>Zarin</ce:surname>
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<ce:e-address>zarin@ufl.edu</ce:e-address>
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<ce:given-name>Valeria F.G</ce:given-name>
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<ce:given-name>Russell G</ce:given-name>
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<ce:textfn>Department of Natural Resources, University of New Hampshire, 56 College Road, Durham, NH 03824, USA</ce:textfn>
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<ce:textfn>Department of Anthropology, 353 Social Sciences 1, University of California, Santa Cruz, CA 95064, USA</ce:textfn>
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<ce:textfn>Departamento de Ciências Florestais, Faculdade de Ciências Agrárias do Pará, Av. Tancredo Neves S/N, cx. Postal 917, CEP 66.077-530, Belém PA, Brazil</ce:textfn>
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<ce:text>Corresponding author. Present address: School of Forest Resources and Conservation, University of Florida, P.O. Box 110760, Gainesville, FL 32611, USA. Tel.: +1-352-846-1247; fax: +1-352-846-1332</ce:text>
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<ce:simple-para>Recent analyses of human impacts on Amazonian landscapes have focused primarily on upland forests that have been deforested as roads have penetrated the frontier. In contrast, relatively little priority has been given to documenting and understanding landscape changes in the roughly 400
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of Amazônia’s floodplains, where an extensive network of waterways has long provided the transportation infrastructure. Amazonian floodplains generally support higher rural population densities than the uplands and provide critical habitat and food for fish and shrimp species, a principal source of protein for millions of rural and urban Amazonians. We examined cover type changes in a 52
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304
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. We found five major cover types discernible in both black-and-white infrared aerial photographs taken in October–November 1976, and Landsat Thematic Mapper (TM) data from November 1991. The cover types were: (1) water and unvegetated banks, (2) herbaceous cover, both natural and agricultural, (3) early regrowth or degraded forest, (4) palm forest, and (5) mixed species
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ha. Logging, heart-of-palm extraction and agricultural conversion are interacting disturbances which, combined with the rapid regrowth that occurs in the tidal floodplains of Amazônia, have produced a landscape characterized by a high rate of cover type transitions and a substantial loss of the mixed species várzea forest. The annualized forest conversion rate is comparable to that reported elsewhere for upland Amazonian landscapes.</ce:simple-para>
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<ce:text>GIS</ce:text>
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<ce:text>Remote sensing</ce:text>
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<abstract lang="en">Recent analyses of human impacts on Amazonian landscapes have focused primarily on upland forests that have been deforested as roads have penetrated the frontier. In contrast, relatively little priority has been given to documenting and understanding landscape changes in the roughly 400000km2 of Amazônia’s floodplains, where an extensive network of waterways has long provided the transportation infrastructure. Amazonian floodplains generally support higher rural population densities than the uplands and provide critical habitat and food for fish and shrimp species, a principal source of protein for millions of rural and urban Amazonians. We examined cover type changes in a 52304ha tidal floodplain near the mouth of the Amazon River in Amapá, Brazil (tidalrange=2–3m). We found five major cover types discernible in both black-and-white infrared aerial photographs taken in October–November 1976, and Landsat Thematic Mapper (TM) data from November 1991. The cover types were: (1) water and unvegetated banks, (2) herbaceous cover, both natural and agricultural, (3) early regrowth or degraded forest, (4) palm forest, and (5) mixed species várzea forest. From 1976 to 1991, the areal extent of the aquatic, herbaceous, early regrowth and degraded forest, and palm forest cover types increased from 2833 to 3406, 10708 to 15074, 3842 to 5446, and 1250 to 3208ha, respectively, while the areal extent of the mixed species várzea forest decreased from 33671 to 25170ha. Logging, heart-of-palm extraction and agricultural conversion are interacting disturbances which, combined with the rapid regrowth that occurs in the tidal floodplains of Amazônia, have produced a landscape characterized by a high rate of cover type transitions and a substantial loss of the mixed species várzea forest. The annualized forest conversion rate is comparable to that reported elsewhere for upland Amazonian landscapes.</abstract>
<note type="content">Fig. 1: Study area location: (a) the state of Amapá is shown in gray; (b) the study area is shown in black.</note>
<note type="content">Fig. 2: The major cover types in the study area.</note>
<note type="content">Fig. 3: Vegetation cover maps of the study area. Cover types are color-coded as follows: AQUA, blue; HERB, pink; REGR, orange; PALM, dark green; VARZ, light green; clouds cover, white. (a) Classification based on visual interpretation of 1976 black-and-white infrared aerial photographs, (b) unsupervised classification of 1991 Landsat TM data with 5×5 majority filter applied to HERB, REGR, PALM and VARZ.</note>
<note type="content">Fig. 4: Spatial extent of the major cover types in 1976 and 1991.</note>
<note type="content">Fig. 5: Transition dynamics for várzea forest, 1976–1991.</note>
<note type="content">Fig. 6: Cover type transitions and the processes which cause them to occur.</note>
<note type="content">Table 1: Error matrix for unsupervised classification of cover types subject to inundation in a Landsat image of the study area recorded on 18 November 1991. Italicface type is used to highlight the number of accuracy assessment sites given identical cover type designations in the field and image classifications</note>
<note type="content">Table 2: Transition matrix for land-cover changes from 1976 to 1991 for the study area. All data are in hectares and are derived from Fig. 3. Italicface type is used to highlight the number of hectares given identical cover type designations in the 1976 and 1991 cover maps</note>
<note type="content">Table 3: Annualized rates of forest conversion from study sites in the Brazilian Amazon</note>
<subject lang="en">
<genre>Keywords</genre>
<topic>Amapá</topic>
<topic>Amazon</topic>
<topic>GIS</topic>
<topic>Landscape change</topic>
<topic>Remote sensing</topic>
<topic>Tidal floodplains</topic>
<topic>Várzea</topic>
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