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 possible limitless blanket of eco-friendly. The effect of immen sity is the same whilst 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 an important 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 wooded area. In September 1985, I received a distinct effect of the rain wooded area. a number of scholars and that i journeyed in a self-propelled automobile alongside the single-track railroad that stretches virtually one thousand km from the Carajas iron ore mine within the rain wooded area of Para nation, Brazil, all of the technique to Sao Luis at the coast (Fig. 1.1).
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Extra resources for Amazonian Rain Forests: Ecosystem Disturbance and Recovery
If the Campa do not want to move when a garden is abandoned, but instead cut new gardens farther downslope, they can prevent the newly abandoned garden from developing into thick impenetrable secondary forest by periodic burning. If the abandoned garden is burned annually during the dry season, a fire subclimax develops. " Grassland Development The evidence from phytosociological studies in the Gran Pajonal suggests the following sequence of vegetation change resulting from fire-associated activities of the Campa.
Dominant weeds are Pteridium aquilinum (bracken fern, or chac-chac) and Imperata brasiliensis (a coarse grass), and a woody species, Baccharis floribunda. 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.
Sites of mature tierrafirme forest were those which long-time residents of the region believed had never been cultivated. Biomass Studies At each site, three 10 x 30 m plots were established. In all plots, individuals with a diameter at breast height (dbh) of more than 1 cm and a height of more than 2 m were identified by local name, and dbh was measured. In addition, three 152-m2 subplots were used for trees with diameters of less than 1 cm and heights of 1 to 2 m. Both living and dead trees were measured.