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Download Amazonian Rain Forests: Ecosystem Disturbance and Recovery by Carl F. Jordan (auth.), Carl F. Jordan (eds.) PDF

By Carl F. Jordan (auth.), Carl F. Jordan (eds.)

DEVELOPMENT AND DISTURBANCE IN AMAZON FORESTS Contrasting Impressions 6 2 The rain forests of the Amazon Basin hide nearly 5.8 x 10 km (Salati and Vose 1984). Flying over even simply a part of this basin, one gazes hour after hour upon this possible limitless blanket of eco-friendly. The effect of immen­ sity is the same whilst seen from the Amazon River itself, or from its tributar­ ies. From a hammock at the shaded deck of a riverboat, the immensity of the woodland offers a tremendous monotony as one view of the coastline blends unnoticeably into one other. From either views, the overpowering response to the ocean of timber that stretches from horizon to horizon is a feeling of the vastness of the rain woodland. In September 1985, I obtained a special influence of the rain wooded area. a number of scholars and that i journeyed in a self-propelled vehicle alongside the single-track railroad that stretches nearly a thousand km from the Carajas iron ore mine within the rain wooded area of Para nation, Brazil, all of the option to Sao Luis at the coast (Fig. 1.1).

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Example text

Total nutrient stocks were calculated by multiplying concentrations for the vegetation components at each site by the biomass at each site. 2. The number of species is plotted as a function of the number of equal-area stands sampled. As often occurs in tropical rain forest sites, the species area curve gives no indication ofleveling off as the area sampled increases. Nevertheless, the sites can be compared because all sampling sites have the same area. Clearly, species diversity increases with increasing age of fallow.

F=-~. Chaco e --· .. ·~·o e "'" Cultivation ------. 5. 4. 4. Shifting Cultivation Where Land Is Limited 43 ~r--. ::;;::;: ..... II==O Old grassland -. 4. 6. 8. During cultivation, stocks of nutrients in vegetation are negligible and there is a trend of decreasing soil stocks for all nutrients. Following abandonment, soil stocks of some nutrients increased for a few years, but over the course of several decades there usually has been a trend of decrease that has paralleled the increase in stocks of nutrients in the successional vegetation.

8. Stocks of nitrogen, phosphorus, and potassium are all lower in the burned sequence in both the vegetation and the soil. Calcium is lower in the vegetation, but no data are available for calcium in the soil. Only magnesium averages higher in the soil, but the differences may not be significant. Resiliance of Forest Recovery of forests from slash and burn agriculture and eventual establishment of primary forests at San Carlos, Venezuela occurred despite very low levels of nutrients in the soil (Chapter 2 and 3).

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