Soil chemical properties of a toposequence under primary rain forest in the Itacoatiara vicinity (Amazonas, Brazil)

Botschek, Johannes; Ferraz, João Baptista Silva; Jahnel, Marcelo; Skowronek, Armin

doi:10.1016/0016-7061(96)00026-2

Cited by 30 publications

(15 citation statements)

References 25 publications

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“…1b). Overall, cation concentrations in our study area ranged from 0.08 to 24.1 cmol(+) kg )1 , comparable with the overall range documented for Brazilian and Peruvian Amazonia (< 0.1-39 cmol(+) kg )1 ; Sanchez & Buol, 1974;Botschek et al, 1996).…”

Section: Floristic and Edaphic Patterns At The Pebas-nauta Boundarysupporting

confidence: 86%

Geological control of floristic composition in Amazonian forests

Higgins

Ruokolainen

Tuomisto

et al. 2011

Journal of Biogeography

184

264

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Aim Conservation and land-use planning require accurate maps of patterns in species composition and an understanding of the factors that control them. Substantial doubt exists, however, about the existence and determinants of largearea floristic divisions in Amazonia. Here we ask whether Amazonian forests are partitioned into broad-scale floristic units on the basis of geological formations and their edaphic properties.Location Western and central Amazonia.Methods We used Landsat imagery and Shuttle Radar Topography Mission (SRTM) digital elevation data to identify a possible floristic and geological discontinuity of over 300 km in northern Peru. We then used plant inventories and soil sampling to document changes in species composition and soil properties across this boundary. Data were obtained from 138 sites distributed along more than 450 km of road and river. On the basis of our findings, we used broad-scale Landsat and SRTM mosaics to identify similar patterns across western and central Amazonia.Results The discontinuity identified in Landsat and SRTM data corresponded to a 15-fold change in soil cation concentrations and an almost total change in plant species composition. This discontinuity appears to be caused by the widespread removal of cation-poor surface sediments by river incision to expose cation-rich sediments beneath. Examination of broad-scale Landsat and SRTM mosaics indicated that equivalent processes have generated a north-south discontinuity of over 1500 km in western Brazil. Due to similarities with our study area, we suggest that this discontinuity represents a chemical and ecological limit between western and central Amazonia.Main conclusions Our findings suggest that Amazonian forests are partitioned into large-area units on the basis of geological formations and their edaphic properties. The evolution of these units through geological time may provide a general mechanism for biotic diversification in Amazonia. These compositional units, moreover, may correspond to broad-scale functional units. The existence of large-area compositional and functional units would suggest that protected-area, carbon sequestration, and other land-use strategies in Amazonia be implemented on a region-by-region basis. The methods described here can be used to map these patterns, and thus enable effective conservation and management of Amazonian forests.

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Section: Floristic and Edaphic Patterns At The Pebas-nauta Boundarysupporting

confidence: 86%

Geological control of floristic composition in Amazonian forests

Higgins

Ruokolainen

Tuomisto

et al. 2011

Journal of Biogeography

184

264

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“…The spatial distribution of soil resources may result from disturbance history or differences in slope characteristics, since gaps tend be more abundant on steep slopes (Poorter et al 1994). In addition, species associated to slopes might be responding to a gradient of soil characteristics such as water availability (Becker et al 1988), nutrients (Botschek et al 1996;Gonzalez and Zak 1996), or soil texture (Chauvel et al 1987).…”

Section: Presence-absence Of Treesmentioning

confidence: 99%

Environmental Correlates of Tree and Seedling–Sapling Distributions in a Mexican Tropical Dry Forest

2005

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Bray and Curtis ordination was used to explore which environmental variables explained importance values and the presence-absence of tropical tree seedlings, saplings and adults in La Escondida-La Caban˜a, Sierra de Manantla´n, Jalisco, Mexico. The diameters of trees ‡2.5 cm DBH and the presence and height of seedlings and saplings were measured in nine 0.1 ha sites. Four matrices including presence-absence data and importance value indices for trees and seedlings and saplings were analyzed through Bray and Curtis ordination. The matrices were based on density, frequency, and dominance of adult trees as well as seedlings and saplings. The environmental matrix consisted of 18 variables, including elevation, slope, canopy gaps, disturbance, and soil variables. We recorded 63 tree species and 38 seedling and sapling species in the nine sites. The ordination explained 70.9% of the variation in importance value data for trees and 62.6% for seedlings and saplings. The variation explained in presence-absence data for trees was 67.1 and 77.4% for seedlings and saplings. The variance in the ordination axes of seedlings and sapling presence-absence data was poorly explained by the number of gaps in the tree, shrub, or herb layer, suggesting little light specialization by seedlings and saplings. Habitat specialization for soil nutrients appears to be important in explaining the presence-absence of seedlings and saplings. Seedling and sapling specialization along different soil microsites could promote species coexistence in this forest, while heterogeneity in light conditions may instead determine differences in growth and, thus, importance value of trees. We hypothesize that in tropical dry forest in Jalisco, Mexico, a habitat specialization for soil resources is likely more important at early stages in tree life histories than in later life history.

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“…High sand content and low clay and silt content could be a reason for low C and N accumulation in the 3-year-old stand (Table 2). Botschek et al (1996) noted that low clay content and lack of aggregation (i.e. absence of soil organic matter protection and stabilization) in coarse-textured soil are major factors limiting soil C storage capacity, despite higher C input from litterfall in the stand.…”

Section: Soil Propertiesmentioning

confidence: 99%

Stand productivity, carbon content, and soil nutrients in different standages of Acacia mangium in Sarawak, Malaysia

Lee¹,

Ong

King³

et al. 2015

Turk J Agric For

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In order to achieve the initial target for the period 2012-2020, planting activity must be intensified to 78,900 ha year -1 . The main species used in the plantation program is Acacia mangium Willd. Even though numerous studies have examined the growth and biomass production of different tree species in Peninsular Malaysia and Sabah, including A. mangium, information on these attributes is still very scarce in Sarawak. Furthermore, reports on the performance of tree species planted at an industrial scale are very limited in Sarawak.Acacia mangium is a fast-growing nitrogen fixer. It is an attractive species for plantation establishment because it grows satisfactorily even in unproductive sites. Average increment in diameter at breast height (d) could reach 3-4 cm year -1 on good sites (Awang and Taylor, 1993). The wood is suitable for many uses such as pulp and paper, particle board, woodchips, sawn timber, veneer, and plywood, as well as firewood (Lemmens et al., 1995).Sarawak is the largest state in Malaysia and is located on the island of Borneo. Most plantations in Sarawak were established in the central lowland region, which comprises elevated wave-cut platforms developed over sedimentary rocks. The Red-Yellow Podzolic soils are low in fertility and water-holding capacity. These limitations

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Soil chemical properties of a toposequence under primary rain forest in the Itacoatiara vicinity (Amazonas, Brazil)

Cited by 30 publications

References 25 publications

Geological control of floristic composition in Amazonian forests

Geological control of floristic composition in Amazonian forests

Environmental Correlates of Tree and Seedling–Sapling Distributions in a Mexican Tropical Dry Forest

Stand productivity, carbon content, and soil nutrients in different standages of Acacia mangium in Sarawak, Malaysia

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