Densidade, germinação e flora do banco de sementes no solo, no final da estação seca, em uma área de caatinga, Quixadá, CE

Costa, Rafael Carvalho da; Araújo, Francisca Soares de

doi:10.1590/s0102-33062003000200008

Cited by 40 publications

(34 citation statements)

References 7 publications

(5 reference statements)

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“…Além disso, a sazonalidade climática exerce influên-cia sobre o número de sementes no solo, sendo esse efeito mais forte na profundidade de 0-5cm (SANTOS et al, 2010) as quais apresentam, para a maioria das espécies, da mesma forma que na floração, germinação no início das chuvas (COSTA e ARAÚJO, 2003).…”

Section: Balanços Hídrico E Bioclimáticounclassified

the Caatinga and desertification

Souza¹,

Artigas²,

Lima³

2015

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ResumoO desmatamento elevado no Bioma Caatinga vem gerando processos de desertificação em diversas áreas, alterando diretamente a biota, o microclima e os solos, sendo fundamental o desenvolvimento de técnicas de pesquisa capazes de incorporar informações que identifiquem o estado dos recursos naturais, apontando os seus relacionamentos e alguns caminhos a serem tomados para uma intervenção eficiente que gere a recuperação e o aproveitamento sustentável das terras nesse ambiente. O MTLFC constitui-se em um conjunto de técnicas utilizado pela primeira vez no Brasil para analisar áreas submetidas à desertificação, apresentando indicadores biogeográficos, climatológicos, geomorfológicos e hidrológicos. Através da aplicação do mé-todo em uma área do município de São Domingos do Cariri (PB), foi identificada uma diversidade vegetal muito baixa (13 espécies e 489 indivíduos), dominância de poucas espécies (5) e baixa abundância, com maior número de indivíduos nos estratos arbustivo alto e arbustivo, tendo como causa a retirada excessiva de vegetação, as queimadas e o uso contínuo pelo gado caprino. O Balanço Hídrico apresentou-se negativo, havendo indicação de que a atividade vegetativa depende da precipitação oculta. Os solos apresentaram crosta superficial de origem antrópica, tornando a aridez edáfica ainda mais acentuada, associada aos baixos níveis de fertilidade, particularmente o potássio e a matéria orgânica. Palavras-chave:Desertificação; MTLFC; Indicadores naturais; Uso dos solos. AbstractHigh deforestation in the Caatinga Biome has been generating processes of desertification in several areas, directly altering the biota, the microclimate and the soils, being essential the development of research techniques able to incorporate information which identify the state of natural resources, pointing their relationships and some paths to be taken for an effective intervention which may generate the recovery and sustainable use of land in this environment. The MTLFC consists of a set of techniques used in Brazil for the first time to analyze areas subjected to desertification, presenting biogeographic, climatological, geomorphological and hydrological indicators. By applying the method in an area of the city of São Domingos do Cariri (PB), it has been identified a very low plant diversity (13 species and 489 individuals), dominance of a few species (5) and low abundance, with the largest number of individuals in tall shrub and shrub strata, caused by the excessive removal of vegetation, fires and continuous use by the goats. The Water Balance was negative so that it indicated that the vegetative activity depends on hidden precipitation. The soils have presented surface crust of an anthropic origin, making edaphic aridity even more pronounced, associated with low fertility levels, particularly potassium and organic matter.Key words: Desertification; MTLFC; Natural indicators; Land Use. ResumenLa deforestación en el Bioma Caatinga ha generado procesos de desertificación en varias áreas, alterando directamente la biot...

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Section: Balanços Hídrico E Bioclimáticounclassified

the Caatinga and desertification

Souza¹,

Artigas²,

Lima³

2015

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“…It exhibits a rich biological diversity (Pereira et al, 2001;Albuquerque and Andrade, 2002;Franca-Rocha et al, 2007). Its vegetation is xeromorphic and highly adapted to the arid conditions, like the hydric defi cit, uneven rains, high temperatures, and unequal soils differing in deepness, fertility, salinity and mineralogical constitution (Albuquerque and Andrade, 2002;Costa and Araújo, 2003). The main impacts to this ecosystem are the extensive cattle raising, agriculture, and vegetal and wood extraction.…”

Section: Introductionmentioning

confidence: 99%

Seedling growth of the invader Calotropis procera in ironstone rupestrian field and seasonally dry forest soils

Oliveira¹,

Negreiros²,

Fernandes³

et al. 2009

NBC

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The present study evaluated the growth, biomass allocation and nutrient content in seedlings of the invasive and exotic especies Calotropis procera (Aiton) W.T. Aiton (Apocynaceae), cultured in greenhouse, in soils from two different ecosystems: ironstone rupestrian fi elds (Canga) of Brumadinho, Minas Gerais; and seasonally dry forest (Caatinga), of Serra Talhada, Pernambuco. Seedlings from the Canga treatment were signifi cantly higher in concern to stem length, leaf biomass and total biomass. In respect to nutrient content there were higher phosphorus, iron and zinc levels in the seedlings from the Canga treatment. The iron accumulation indicates the capacity of C. procera to tolerate high levels of iron, which is characteristic of Canga soils. In the Caatinga treatment there was a higher root/ shoot ratio and a higher potassium accumulation in the plant tissues. The obtained results suggest that C. procera displays a good adaptation to the edaphic conditions of the Canga treatment, which indicates an invasive potential towards the Canga ecosystem.

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“…B.;Rodal, M. J. N. & Silva, A. C. B. L. Rodriguésia 59 (4): 649-658. 2008 1997; Lima 2007), as síndromes de dispersão (Griz & Machado 2001;Barbosa et al 2002), os sistemas de reprodução (Machado & Lopes 2004), a dinâmica de populações (Araújo 1998) e o banco de sementes (Costa & Araújo 2003;Mamede & Araújo 2008;Pessoa 2007).…”

Section: Introductionunclassified

Chuva de sementes em uma área de vegetação de Caatinga no estado de Pernambuco

2008

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RESUMO ABSTRACT(Seed rain in an area of Caatinga vegetation in Pernambuco State) The current study describes the composition and density of seed rain in one hectare of Caatinga vegetation. Forty seed traps of 0.25 m 2 each were set, and visited monthly during one year. Were sampled 76 seeds m 2 and 26 species. Tillandsia spp. (Bromeliaceae) contributed with the majority (49%) of seed deposition. There was no significative correlation between density of deposition of seeds and precipitation monthly. The seeds of woody plants (tree and bushes) were preferentially autochoric.

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Densidade, germinação e flora do banco de sementes no solo, no final da estação seca, em uma área de caatinga, Quixadá, CE

Cited by 40 publications

References 7 publications

the Caatinga and desertification

the Caatinga and desertification

Seedling growth of the invader Calotropis procera in ironstone rupestrian field and seasonally dry forest soils

Chuva de sementes em uma área de vegetação de Caatinga no estado de Pernambuco

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