the Caatinga and desertification

Souza, Bartolomeu Israel de; Artigas, Rafael Cámara; Lima, Eduardo Rodrigues Viana de

doi:10.4215/rm2015.1401.0009

Cited by 63 publications

(65 citation statements)

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“…O processo de desertificação pode ser entendido como a transformação de áreas em deserto, o que por muito tempo tem sido tema de discussão e preocupação em todo o mundo (SOUZA et al, 2015). No passado entendia-se que este processo era ligado apenas aos resultados das pressões antrópicas sobre o meio, bem como às variabilidades climáticas; no entanto, esses não são os únicos fatores que influenciam uma área ao processo de desertificação.…”

Section: Introductionunclassified

Diagnóstico Da Desertificação Na Região Norte De Minas Gerais Por Meio De Técnicas De Geoprocessamento

2017

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RESUMOO processo de desertificação é conhecido em todo mundo pelo seu poder de transformar terras produtivas em terras não produtivas. Vários locais são afetados por esse processo, que vem avançando de forma gradativa, principalmente pelas ações antrópicas e pelas variáveis climáticas. Este trabalho teve como objetivo o estudo da desertificação na região norte do estado de Minas Gerias, obtendo um diagnóstico da situação atual utilizando o geoprocessamento. Foram utilizados dados dos atributos ambientais (declividade, erosividade, cobertura do solo, classes de solos e índice de aridez). Com o cruzamento destes atributos foram gerados mapas temáticos de susceptibilidade ambiental à erosão, susceptibilidade climática à desertificação e susceptibilidade ambiental à desertificação que possibilitou uma análise do processo na região. Pode-se concluir que a maior parte da área, cerca de 60%, encontra-se em média susceptibilidade ambiental à desertificação, numa região que compreende as localidades das estações meteorológicas de Espinosa, Monte Azul e Mocambinho.Palavras-chave: Susceptibilidade à Desertificação. Susceptibilidade à Erosão. Degradação Ambiental. ABSTRACTThe process of desertification is known throughout the world for its power to transform productive land into nonproductive land. Multiple locations are affected by this process, which has been advancing gradually mainly by anthropogenic actions and climatic variables. This work aimed to study desertification in the northern region of the state of Minas Gerais, getting a diagnosis of the current situation using the geoprocessing. Data from environmental attributes were used (slope, erosivity, land cover, soil classes and aridity index). With the intersection of these attributes were generated thematic maps of environmental susceptibility to erosion, climate susceptibility to desertification and environmental susceptibility to desertification, which allowed an analysis of the process in the region. It can be concluded that most of the area, about 60%, are on average environmental susceptible to desertification, in a region that includes the locations of meteorological stations of Espinosa, Monte Azul and Mocambinho.

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Section: Introductionunclassified

Diagnóstico Da Desertificação Na Região Norte De Minas Gerais Por Meio De Técnicas De Geoprocessamento

2017

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“…However, contrary to expectations, the Caatinga presents high species richness with a high degree of endemism, including vegetation that is widely diversified with more than 4,600 species of angiosperms, 20% of which are endemic (BFG 2015). Nevertheless, research on the flora of the Caatinga is still insufficient when considering the high richness associated with its environments (Souza et al 2015).…”

Section: Discussionmentioning

confidence: 99%

First record of Wissadula hernandioides (L’Hér.) Garcke (Malvoideae, Malvaceae) for the Caatinga domain in Brazil

Amorim¹,

Lima²,

Ferreira³

et al. 2019

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Wissadula hernandioides (L’Hér.) Garcke is native to Brazil and can be identified by its subshrub habit, cordate and discolor leaves with usually stellate trichomes, yellowish flowers arranged in paniculate inflorescences, and schizocarpic fruits. Before our finding, this species was recorded in Brazil only in Cerrado, Atlantic Forest, Amazon and Pantanal vegetation. The population found in Caatinga domain and Pernambuco state expands the distribution of W. hernandioides. A morphological description, habitat, and the current geographic distribution, as well as original drawing are provided.

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“…Sixty-five transects, 50 m × 2 m each one, were established in Environmental Protection Area of Cariri between January and November 2017, according to linear transect method for phanerophytes and camphids (LTMPC) [25]. The LTMPC was successfully adopted in previous studies in Caatinga [26]. Seven different vegetation plots (V.P.)…”

Section: Methodsmentioning

confidence: 99%

Tropical forest refuge in peripheral soils of slags in Caatinga

Jjll

et al. 2018

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18The influence of environmental factors on the structure and composition of plant 19 communities in the Caatinga is complex and poorly explored. Spatial variation of 20 biodiversity in Caatinga is poorly know and strictly attributed to climatic conditions. 21 We investigated the influence of slags on floristic composition and structure of a 22 shrubby-arboreal community in one of the driest region in Brazil. Chemical and 23 physical analyses of soils were performed in samples of seven plots from savannic 24 formations and from forest formations. Vegetation was characterized floristically and 25 structurally in all plots. Habitats were structurally distinct, and diversity differed 2 26between peripheral and non-peripheral areas of slags. Nine of the ninety-seven species 27 identified are reported to (sub)humid biomes. Soils are dominantly shallow, eutrophic 28 and sandy loam. However, soils in the periphery of slags are more developed once 29 paludization, melanization and bioturbation were verified. Our results suggest that soil 30 fertility did not influence vegetable cover in Caatinga. The cover of plant species 31 considered exclusive of (sub)humid biomes in Brazil extends beyond highlands in the 32 semiarid, associated with high soil organic carbon content and water retention capacity 33 of more developed soils than the typical of the Caatinga. 34 35 36 Dryland biomes cover 41.5 % of the Earth's surface, with seasonally dry tropical 37 forests occupying approximately 1,327 million hectares within this area [1]. The largest 38 area of continuous dry tropical rainforests in Latin America occurs in Brazil, with 39 approximately 800.00 km². Popularly called as Caatinga (Mata Branca), most trees and 40shrubs lose their leaves in the dry season, which can last up to nine months a year in 41 certain regions [2]. 42 Caatinga is a Brazilian exclusive biome composed by different plant formations 43 [3] and its diversity is considered one of the most biodiverse among semiarid biomes 44 [4,5]. Among the several ecosystems that exist in the Caatinga, granitic intrusions in the 45 form of inselbergs, massive, slags (lajedos in portuguese) and bornhardts cover 15 % of 46 the total area of the northern Brazilian Northeast [6]. 47Low developed, shallow and eutrophic soils are dominant in Caatinga due to 48 tropical dry climate. However, high local diversity of soils has been attributed to 49 variance of lithology and, or, relief by recent studies [7]. Understood soil diversity is a 50 relevant task, especially considering that plant distribution is conditionate by soil 3 51 properties [8,9]. Soil influences plant physiognomies in Brazilian Savanna (Cerrado) 52[10], Restinga forest [11], Amazonia rainforest [12,13], Tundra [14] and other biomes 53 around the world [15,16]. However, species diversity in Caatinga is poorly know [17] 54 and strictly attributed to climatic conditions [18][19][20]. 55The purpose of this study was to investigate a vegetation gradient at preserved 56 slabs in Caatinga, and t...

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the Caatinga and desertification

Cited by 63 publications

References 16 publications

Diagnóstico Da Desertificação Na Região Norte De Minas Gerais Por Meio De Técnicas De Geoprocessamento

Diagnóstico Da Desertificação Na Região Norte De Minas Gerais Por Meio De Técnicas De Geoprocessamento

First record of Wissadula hernandioides (L’Hér.) Garcke (Malvoideae, Malvaceae) for the Caatinga domain in Brazil

Tropical forest refuge in peripheral soils of slags in Caatinga

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the Caatinga and desertification

Cited by 63 publications

References 16 publications

Diagnóstico Da Desertificação Na Região Norte De Minas Gerais Por Meio De Técnicas De Geoprocessamento

Diagnóstico Da Desertificação Na Região Norte De Minas Gerais Por Meio De Técnicas De Geoprocessamento

First record of Wissadula hernandioides (L&rsquo;H&eacute;r.) Garcke (Malvoideae, Malvaceae) for the Caatinga domain in Brazil

Tropical forest refuge in peripheral soils of slags in Caatinga

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First record of Wissadula hernandioides (L’Hér.) Garcke (Malvoideae, Malvaceae) for the Caatinga domain in Brazil