Abandoned Pastures in Eastern Amazonia. II. Nutrient Stocks in the Soil and Vegetation

Buschbacher, R.; Uhl, Christopher; Serrão, E. A. S.

doi:10.2307/2260567

Cited by 243 publications

(128 citation statements)

References 13 publications

Supporting

Mentioning

108

Contrasting

Unclassified

Order By: Relevance

“…As vegetation develops, the nutrient levels in the soil at any given time will be a balance between (a) retention of nutrients in biomass, (b) turn over and decomposition of biomass which adds nutrients to the soil, and (c) leaching of nutrients out of the zones of plant root accessibility. The recovery of soil to its previous functions varies with forest type (Brown and Lugo, 1990), soil type (Allen, 1985;Neill et al, 1997) and the type and intensity of past land use (Buschbacher et al, 1988;Neill et al, 1997).…”

Section: Soil Nutrient Effects On Root and Am Variablesmentioning

confidence: 99%

Distribution of roots and arbuscular mycorrhizal associations in tropical forest types of Xishuangbanna, southwest China

Muthukumar

Sha

Yang

et al. 2003

Applied Soil Ecology

View full text Add to dashboard Cite

Root distribution and mycorrhizal associations were compared in primary, secondary and limestone forests in Xishuangbanna, southwest China. Soil cores to a depth of 20 cm were collected at random points from four 50 m 2 quadrats in each forest type. Arbuscular mycorrhizal (AM) associations were the only form of mycorrhiza found in all forest types. The primary forest was characterized by high root mass, root lengths and AM colonization levels higher than other forest types. In contrast, secondary forests had greater AM fungal spore numbers and specific root length, indicating that plant species in secondary forests achieved a greater degree of soil exploration with less biomass allocation to roots. Root density, AM colonization and AM fungal spore numbers decreased with soil depth in all forest types. Although the correlation between AM colonization levels and spore numbers was insignificant when all forest types were considered together, significant relationships emerged when each forest type was considered individually. AM colonization and spore numbers were correlated with several root variables.

show abstract

Section: Soil Nutrient Effects On Root and Am Variablesmentioning

confidence: 99%

Distribution of roots and arbuscular mycorrhizal associations in tropical forest types of Xishuangbanna, southwest China

Muthukumar

Sha

Yang

et al. 2003

Applied Soil Ecology

View full text Add to dashboard Cite

show abstract

“…In the Amazon region, many of these lands are abandoned after several years of use and often develop into secondary forests (Uhl et al 1981, Uhl and Jordan 1984, Uhl 1987. Species composition of primary and secondary forests may vary according to the history of land use (Mesquita et al 2001), intensity of anthropic perturbation (Buschbacher et al 1988), competitive interactions among species (Huston 1979) and the availability of seeds in the soil seed bank .…”

Section: Introductionmentioning

confidence: 99%

Seed size influence on germination responses to light and temperature of seven pioneer tree species from the Central Amazon

Aud

Ferraz

2012

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

In Amazon secondary forests are dominated by pioneer species that typically produce large amounts of small and dormant seeds that are able to form a persistent soil seed bank. Seed dormancy in this group of species is overcome by environmental conditions found in open areas, such as high irradiation or alternating temperatures. Nevertheless, a variety of germination responses to environmental factors is known among pioneers; some of them may germinate in diffuse light or in darkness condition at constant temperature. Seed mass can be considered as one of the factors that promotes this variety. Regarding species with very small seeds, it seems that the trigger for germination is light and for larger seeds temperature alternation may be a more important stimulus. In this study we established a relationship between seed mass and germination response to light and alternating temperature for a group of seven woody pioneer species from the Amazon forest. We found that an increase in seed mass was followed by a decrease in the need for light and an increase in the tolerance to alternating temperatures. Understanding germination strategies may contribute with the knowledge of species coexistence in high diverse environments and also may assist those involved in forest management and restoration.

show abstract

Section: Introductionunclassified

“…Tal vegetação provê uma combinação de árvores, arbustos e ervas, sendo geralmente instável e apresentando estádios sucessionais. Como a restauração da floresta ao seu estado original é muito difícil de ocorrer, a biomassa associada com pastagens e florestas secundárias em desenvolvimento é sempre menor que a da floresta original (BUSCHBACHER; UHL; SERRÃO, 1988).O acúmulo de biomassa em florestas secundárias mostra um modelo de rápida acumulação em até 15 a 20 anos de pousio, contudo a taxa de incremento de biomassa está inversamente relacionada com o tempo de uso agrícola (HUGGES et al, 1992). Florestas secundárias em Porto Rico apresentam valores de biomassa similares à floresta madura somente após 40 anos de pousio (AIDE et al, 2000).…”

unclassified

Biomassa E Florística Em Florestas Secundárias De Diferentes Idades

Oliveira¹

2011

View full text Add to dashboard Cite

ResumoEste trabalho foi desenvolvido no município de União, PI, localizado na região centro-norte do estado, e tem como objetivo determinar a produção de biomassa e a composição florística em matas secundárias com diferentes idades após o cultivo agrícola tradicional (um, três e cinco anos de pousio, com dois tratamentos para cada idade). Para análise da vegetação, foram estabelecidas 20 parcelas em cada idade de pousio. Para levantamento das espécies arbóreas/arbustivas, foram usadas parcelas com 25 m² e, dentro destas, subparcelas com 2,0 m² para as espécies herbáceas. Os resultados mostram 100 espécies ocorrentes nas áreas, sendo 42 de porte arbustivo/arbóreo e 58 herbáceas. As capoeiras com um, três e cinco anos apresentaram, respectivamente, 3,4; 6,0 e 6,7 ton.ha -1 de massa seca. Palavras-chave: Sucessão secundária; pousio; massa seca; levantamento florístico. AbstractBiomass production and floristic of secondary forests of different ages. This study was developed in the Union county, localized in center-north region of the Piaui State, and aim to determine the production of biomass and floristic composition of secondary forests with different ages after slash and burn agriculture (one, three and five years-old regeneration stages, with two replicates). For analysis of vegetation they were established 20 plots by each different age of fallow. Plots were used with areas of 25.0 m 2 by shrub/tree and, within these, subplots with 2.0 m² were allocated for the herbaceous species. The results show that 100 species occur in the area, 42 shrubs and 58 herbaceous species; the secondary forest with one, three and five years present total biomass of 3.4; 6.0 and 6.7 ton ha -1 of total dry mass per hectare, respectively. Keywords: Secondary succession; fallow; dry mass; floristic survey; frequency. INTRODUÇÃOEm países tropicais, é grande o número de produtores que praticam a agricultura itinerante, cujo preparo da terra envolve o corte e a queima da vegetação. Na sequência é feito o plantio na área queimada, aproveitando-se os nutrientes disponíveis nas cinzas. Dois a três anos depois, os nutrientes tornam-se escassos e as plantas invasoras tornam-se um problema. Os produtores, então, abandonam o local por 10 a 20 anos, permitindo às espécies locais reflorestarem a área (sucessão secundária). Dessa forma, é necessário desmatar e limpar outras áreas para realizar novos cultivos, repetindo o processo.As florestas secundárias podem ser definidas como vegetação sucessional, que se regenera após a vegetação inicial ter sido removida por ação antrópica (FAO, 2002). Tal vegetação provê uma combinação de árvores, arbustos e ervas, sendo geralmente instável e apresentando estádios sucessionais. Como a restauração da floresta ao seu estado original é muito difícil de ocorrer, a biomassa associada com pastagens e florestas secundárias em desenvolvimento é sempre menor que a da floresta original (BUSCHBACHER; UHL; SERRÃO, 1988).O acúmulo de biomassa em florestas secundárias mostra um modelo de rápida acumulação em até 15 a 20 an...

show abstract

Abandoned Pastures in Eastern Amazonia. II. Nutrient Stocks in the Soil and Vegetation

Cited by 243 publications

References 13 publications

Distribution of roots and arbuscular mycorrhizal associations in tropical forest types of Xishuangbanna, southwest China

Distribution of roots and arbuscular mycorrhizal associations in tropical forest types of Xishuangbanna, southwest China

Seed size influence on germination responses to light and temperature of seven pioneer tree species from the Central Amazon

Biomassa E Florística Em Florestas Secundárias De Diferentes Idades

Contact Info

Product

Resources

About