Desert vegetation and vegetation-environment relationships in Kirthar National Park, Sindh, Pakistan

Enright, Neal J.; Miller, Ben P.; Akhter, R.

doi:10.1016/j.jaridenv.2004.09.009

Cited by 81 publications

(47 citation statements)

References 30 publications

(38 reference statements)

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“…Em 2013, todos os resultados destas variáveis se aproximaram ao das regiões áridas, com a biomassa vegetal abaixo de 2 Mg • ha -1 (Cowlishaw & Davies, 1997;Hegazy et al, 1998;Houérou, 1997;Abbadi et al, 2002;Enright et al, 2005;Hanafi, 2008;Bisigato et al, 2009;Vilela et al, 2009), com registros da fauna nativa (mastofauna, avifauna e hepertofauna) menores que 10 indivíduos por hectares (Wang et al, 2001;Scott et al, 2005;Ojeda & Tabeni, 2009;Fokidis, 2011;Rodríguez & Ojeda, 2011;McDonald, 2012;Herrmann & Branch, 2013) e índices de diversidade de Shannon menores que 0,3 (Houérou, 1997;Kraaij & Milton, 2006;Chillo & Ojeda, 2012;Sow et al, 2014). Essas tendências dos dados também foram descritas em outras localidades áridas submetidas à perturbação antrópica, à mudança do uso da terra e ao extrativismo (Tabeni & Ojeda, 2003Reij et al, 2005;Sow et al, 2014).…”

Section: Resultados Das Variáveis Ambientais E Humanasunclassified

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Santana

2016

Desenvolv. Meio Ambiente

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Artigo recebido em 19 de outubro de 2015, versão final aceita em 23 de maio de 2016. RESUMO:A região analisada é historicamente um espaço de conflitos e de uma "violência fundadora", situada acima do médio São Francisco, entre as cidades de Ibimirim e Cabrobó (Pernambuco/Brasil). A presença desses conflitos, associada ao colapso ambiental causado pelo neoextrativismo local e ao clima árido, são fortes indícios para influenciarem a dinâmica populacional. Porém, o contrário é observado na região. A manutenção da população na região é corroborada pelo baixo valor de emigração e pelas narrativas. Por isso, variáveis ambientais e sociais foram coletadas e analisadas para avaliar se a ausência de uma dinâmica populacional é motivada por uma resistência social. Assim, o objetivo deste trabalho foi analisar o contexto ambiental e a narrativa de quem ficou no colapso da matéria-prima na Caatinga Árida pós-neo-extrativismo, onde se pôde notar que a manutenção da população na região trata-se de uma expressão da resistência social local, na interface entre parâmetros ambientais e sociais analisados. A preservação da herança familiar (patrimonialismo) foi considerada o principal destaque nas narrativas dos sertanejos.Palavras-chave: mobilização social; desertificação; neoextrativismo. ABSTRACT:The analyzed region is historically a place of conflict and a 'founding violence', situated above São Francisco River, between the cities of Ibimirim and Cabrobó (Pernambuco/Brazil). The presence of those conflicts, associated with the environmental collapse, caused by the new local extractiv and arid climate, are strong evidence to act on population dynamics. However, the opposite is observed in the region. The maintenance of population there is supported by the low value of emigration and by narratives. Therefore, environmental and social variables were collected and analyzed to assess whether a social resistance motivates the lack of population dynamics. The objective of this study was to analyze the environmental context and the narratives of who remained in collapse of raw material in Arid Caatinga post the new extractivism. Where one might note that the maintenance of the population in the region is an expression of local social resistance, on the

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Section: Resultados Das Variáveis Ambientais E Humanasunclassified

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Santana

2016

Desenvolv. Meio Ambiente

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“…The observed pattern of species composition with large number of perennial grasses in the lower slope position of the rehabilitated area could be a result of improved fertility, drainage, and depth of the soils downslope (Boll et al 2005;Enright et al 2005).…”

Section: Herbaceous Species Compositionmentioning

confidence: 95%

“…Slope gradient influences the accumulation and export of soil nutrients downslope, thereby directly or indirectly affecting vegetation distribution (Zuo 2012). Slope also affects the physical chemical properties of the soil which in turn affects the distribution and diversity of species (Enright et al 2005). Soils in higher altitudes are frequently washed of their nutrients which are then deposited in the lower slopes (Hosseinzadeh et al 2016).…”

Section: Species Richness Relative Abundance and Diversitymentioning

confidence: 99%

Effect of rangeland rehabilitation on the herbaceous species composition and diversity in Suswa catchment, Narok County, Kenya

et al. 2017

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Introduction: Land degradation is a serious environmental problem of our time. In Kenya, it is estimated that 30% of the total land mass is severely degraded. Suswa catchment within Narok County is a good example with gullies of over 25 m deep and 30 m wide. In response to the increasing land degradation in the area, the Sustainable Land Management (SLM) project rehabilitated the catchment through establishment of soil and water conservation structures such as cutoff drains, semicircular bunds, and water retention ditches. Despite the various rehabilitation approaches carried out, little research has been done to ascertain their effect on successful vegetation recovery. This coupled with the fact that many restoration approaches have failed in East Africa and Kenya in particular gave drive to the study. The objective of this study was to determine the effects of rangeland rehabilitation on herbaceous species composition and diversity in a severely degraded rangeland. Methods: To assess the diversity of aboveground herbaceous layer in the rehabilitated and degraded areas along a slope (upper, middle, and lower), line transect and quadrat count methods were used. Within each slope position, three 100-m-long transects were placed across the hill parallel to one another 30 m apart using a tape. The species hit, the closest species to the hit, and hits on bare ground were recorded. Along the same transects, 1-m 2 quadrats were placed 25 m apart and aboveground biomass determined by the use of the destructive method. In the determination of species richness, diversity, relative abundance, percentage cover, and species composition, the Shannon-Wiener diversity index was used. Data collected on vegetation attributes was subjected to analysis of variance (ANOVA) using Genstat and Tukey's HSD post hoc used in means separation where F values were significant. Results: The results showed that percent cover (74.67%), aboveground biomass (1459 kg/ha), relative abundance, richness, composition, and diversity of perennial grasses significantly (P ≤ 0.05) increased downslope and were higher in the rehabilitated area than in the degraded area. On the contrary, forbs and annual grasses were significantly (P ≤ 0.05) higher within the degraded area compared to the rehabilitated area and increased upslope.

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“…The spatial distribution pattern of the desert vegetation is related to the heterogeneous topography, landform and soil physical-chemical properties, as shown for the Cholistan and Thal deserts in Pakistan (Dasti et al, 1994), the southern Sinail desert in Egypt (El-Ghani et al, 2003), and the Thar desert in India and Kirthar National Park in Sindh of Pakistan (Enright et al, 2005).…”

Section: Relationship Between Vegetation Patterns and Environmental Fmentioning

confidence: 99%

Vegetation patterns and species—environment relationships in the Gurbantunggut Desert of China

Yi-bing

Zhao

et al. 2008

J. Geogr. Sci.

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The Gurbantunggut Desert is the largest stable and semi-stable sand desert in China, yet few data exist on vegetation pattern and species-environment relationships for these diverse desert landscapes. The sand dunes of the survey area are mainly of the longitudinal form from north to south, but checkerboard-shaped and honeycomb-shaped forms are also present, with the height of 10-50 m. We measured vegetation and soil data on north-south transects and compared them with vegetation and soil data on east-west transects. Analysis revealed that the varying trend and strength of the species diversity, dominance and cover of the plant communities in the longitudinal and transverse directions across the landscape are significantly different. The results of CCA ordination show that the microhabitats of soil organic matter (OM), soil salts (TS), sorting index (σ), topsoil water-content (SM) and pH relate to the differences in vegetation observed as differences in species assemblage from salt-intolerant ephemerals, micro-subshrubs and subshrubs to salt-tolerant shrubs and micro-arbors. The terrain (alt.) and soil texture (the contents of Mz and φ 1 ) affect the spatial differentiation of many species. However, this spatial differentiation is not so marked on transects running longitudinally with the landscape, in the same direction as the dunes. The species of the desert vegetation have formed three assemblages under the action of habitat gradients, relating to three sections running transversely across the landscape, at right angles to the direction of the dune crests. In the mid-east section of the study area the topography is higher, with sand-lands or dune-slopes with coarse particles. Here the dominant vegetation comprises shrubs and subshrubs of Seriphidium santolium and Ephedra distachya, with large numbers of ephemeral and ephemeroid plants of Senecio subdentatus, and Carex physodes in spring and summer. On the soil of the dune-slopes in the mid-west of the study area, with coarse particles and abundant TK, the plant assemblage of Haloxylon persicum, Soranthus meyeri and Agriophyllum squarrosum is developed. The species composition in the east marginal belt of the study area has similar characteristics to the mid-west section. There is no corresponding section in the north-south transects (except for the north and south margins). This is because the habitats of most plants are located in the middle of QIAN Yibing et al.: Vegetation patterns and species-environment relationships in the Gurbantunggut Desert 401 the microhabitat gradients in the north-south direction in the desert.

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Desert vegetation and vegetation-environment relationships in Kirthar National Park, Sindh, Pakistan

Cited by 81 publications

References 30 publications

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Effect of rangeland rehabilitation on the herbaceous species composition and diversity in Suswa catchment, Narok County, Kenya

Vegetation patterns and species—environment relationships in the Gurbantunggut Desert of China

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