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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
04/05/2001 |
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Data da última atualização: |
30/03/2017 |
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Autoria: |
LUDWIG, J. A.; MULDAVIN, E.; BLANCHE, K. R. |
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Título: |
Vegetation change and surface erosion in desert grasslands of Otero Mesa, Southern New Mexico: 1982 to 1995. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
American Midland Naturalist, v.144, n.2, p.273-285, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
Desert grasslands that skirt mountain ranges in northern Mexico and the southwestern United States were once common. These grassland have largely been replaced by shrublands and their soils have become eroded. The most frequently cited causes of these changes are livestock overgrazing, fire and increasing aridity. Studies have not separated grazing and fire from climate effects. Our aim was to determine whether desert grasses are being replaced by shrubs and how rapidly soil surfaces are eroding on unburnt Otero Mesa desert grassland, where livestock overgrazing has not been a significant factor in historic or recent times. In this article we describe how vegetation and soil surface levels changed from 1982 to 1995 on six permanent transects. Vegetation was measurement by charting canopy cover and stem bases of perennial plants in quadrats. Soil surface levels were surveyed in refrerence to benchmarks placed in nearby bedrock. Vegetation quadrats and surface levels were remeasured in 1995. From 1982-1983 to 1995 the canopy cover of the desert shrubs, Larrea tridentada and Gutierrezia microcephala, declined by 1.5% and 5.8%, respectively. Canopy cover of the C4 xeric grass Bouteloua eriopoda declined by 5.3%. This decline in xeric grass cover was offset by a 1.2% increase in the C4 mesic grass Bouteloua curtipendula and 4.0% increase in the C3 grass Stipa neomexicana. From 1983-1984 to 1995 soil surfaces along transects eroded an average of 0.4 mm.y-1. Thus, desert shrubs were not replacing desert grasses, but mesic grass species were replacingf xeric species. These changes were associated with a 15-y period of relatively wet cool-seasons and moist warm-seasons from 1981 throught 1995. These results document that, even in the absence of livestock grazing and fire, desert grassland vegetation is very resposive to precipitation change over relatively short time periods. MenosDesert grasslands that skirt mountain ranges in northern Mexico and the southwestern United States were once common. These grassland have largely been replaced by shrublands and their soils have become eroded. The most frequently cited causes of these changes are livestock overgrazing, fire and increasing aridity. Studies have not separated grazing and fire from climate effects. Our aim was to determine whether desert grasses are being replaced by shrubs and how rapidly soil surfaces are eroding on unburnt Otero Mesa desert grassland, where livestock overgrazing has not been a significant factor in historic or recent times. In this article we describe how vegetation and soil surface levels changed from 1982 to 1995 on six permanent transects. Vegetation was measurement by charting canopy cover and stem bases of perennial plants in quadrats. Soil surface levels were surveyed in refrerence to benchmarks placed in nearby bedrock. Vegetation quadrats and surface levels were remeasured in 1995. From 1982-1983 to 1995 the canopy cover of the desert shrubs, Larrea tridentada and Gutierrezia microcephala, declined by 1.5% and 5.8%, respectively. Canopy cover of the C4 xeric grass Bouteloua eriopoda declined by 5.3%. This decline in xeric grass cover was offset by a 1.2% increase in the C4 mesic grass Bouteloua curtipendula and 4.0% increase in the C3 grass Stipa neomexicana. From 1983-1984 to 1995 soil surfaces along transects eroded an average of 0.4 mm.y-1. Thus, desert shrubs wer... Mostrar Tudo |
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Palavras-Chave: |
Desert; Erosion; Grassland; Otero Mesa. |
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Thesagro: |
Deserto; Erosão; Pastagem; Vegetação. |
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Thesaurus Nal: |
New Mexico; vegetation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02603naa a2200265 a 4500
001 1806239
005 2017-03-30
008 2000 bl --- 0-- u #d
100 1 $aLUDWIG, J. A.
245 $aVegetation change and surface erosion in desert grasslands of Otero Mesa, Southern New Mexico$b1982 to 1995.
260 $c2000
520 $aDesert grasslands that skirt mountain ranges in northern Mexico and the southwestern United States were once common. These grassland have largely been replaced by shrublands and their soils have become eroded. The most frequently cited causes of these changes are livestock overgrazing, fire and increasing aridity. Studies have not separated grazing and fire from climate effects. Our aim was to determine whether desert grasses are being replaced by shrubs and how rapidly soil surfaces are eroding on unburnt Otero Mesa desert grassland, where livestock overgrazing has not been a significant factor in historic or recent times. In this article we describe how vegetation and soil surface levels changed from 1982 to 1995 on six permanent transects. Vegetation was measurement by charting canopy cover and stem bases of perennial plants in quadrats. Soil surface levels were surveyed in refrerence to benchmarks placed in nearby bedrock. Vegetation quadrats and surface levels were remeasured in 1995. From 1982-1983 to 1995 the canopy cover of the desert shrubs, Larrea tridentada and Gutierrezia microcephala, declined by 1.5% and 5.8%, respectively. Canopy cover of the C4 xeric grass Bouteloua eriopoda declined by 5.3%. This decline in xeric grass cover was offset by a 1.2% increase in the C4 mesic grass Bouteloua curtipendula and 4.0% increase in the C3 grass Stipa neomexicana. From 1983-1984 to 1995 soil surfaces along transects eroded an average of 0.4 mm.y-1. Thus, desert shrubs were not replacing desert grasses, but mesic grass species were replacingf xeric species. These changes were associated with a 15-y period of relatively wet cool-seasons and moist warm-seasons from 1981 throught 1995. These results document that, even in the absence of livestock grazing and fire, desert grassland vegetation is very resposive to precipitation change over relatively short time periods.
650 $aNew Mexico
650 $avegetation
650 $aDeserto
650 $aErosão
650 $aPastagem
650 $aVegetação
653 $aDesert
653 $aErosion
653 $aGrassland
653 $aOtero Mesa
700 1 $aMULDAVIN, E.
700 1 $aBLANCHE, K. R.
773 $tAmerican Midland Naturalist$gv.144, n.2, p.273-285, 2000.
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Embrapa Pantanal (CPAP) |
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| 1. |  | SIMOES, W. L.; OLIVEIRA, A. R. de; SILVA, J. S. da; TORRES JÚNIOR, V. G.; SILVA, W. O. da; MORAIS, L. K. de. Trocas gasosas em variedades de cana-de-açúcar submetidas a deficit hídrico no Submédio São Francisco. In: INOVAGRI INTERNATIONAL MEETING, 5.; CONGRESSO NACIONAL DE IRRIGAÇÃO E DRENAGEM, 28.; SIMPÓSIO LATINO AMERICANO DE SALINIDADE, 1., 2019, Fortaleza. Anais... Fortaleza: Instituto de Pesquisa e Inovação na Agricultura Irrigada: UFC: ABID, 2019.| Tipo: Artigo em Anais de Congresso |
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