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 conceal 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 probably limitless blanket of eco-friendly. The impact of immen sity is identical while considered 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 bushes that stretches from horizon to horizon is a feeling of the vastness of the rain woodland. In September 1985, I bought a distinct impact 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 virtually a thousand km from the Carajas iron ore mine within the rain woodland of Para nation, Brazil, the entire strategy to Sao Luis at the coast (Fig. 1.1).
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Additional info for Amazonian Rain Forests: Ecosystem Disturbance and Recovery
3. Following abandonment from cultivation and initiation of annual burning, the chac-chac stage dominated by Pteridium aquilinum begins. Some erosion of the soil surface is evident. 4. Chac-chac gives way to a cover dominated by Imperata brasiliensis. Soil erosion continues, infiltration rates decrease, and there is some invasion by Andropogon spp. (Andropogon is a genus of grass, many species of which 38 G. A. J. Scott are found on soils low in nutrients, and sometimes called "poverty grasses.
Throughout the 3 years of grazing on the pasture derived from primary forest there was a marked decrease in total ecosystem stocks of calcium, magnesium, and potassium, but no decrease in nitrogen. Stocks of nitrogen, magnesium, and potassium in the pasture formed from secondary forest followed the same trends, but calcium increased. The most important difference between pasture derived from primary forest and that from secondary forest is in the level of soil nutrients at the initiation of grazing.
At the time that this pasture establishment was occurring, there was a field station at San Carlos that served as headquarters for an ecological research project on the structure and function on the rain forest in the region. 1 in this book. Because of the presence of a scientific infrastructure at San Carlos, it was decided to take advantage of the pasture establishment to conduct a study of the effect that this type of development would have on nutrient cycling, productivity, and resilience of the rain forest.
Amazonian Rain Forests: Ecosystem Disturbance and Recovery by Carl F. Jordan (auth.), Carl F. Jordan (eds.)