Download Primary Succession and Ecosystem Rehabilitation by Lawrence R. Walker PDF

By Lawrence R. Walker

This quantity presents the 1st accomplished precis of ways plant, animal, and microbial groups enhance lower than the tough stipulations following dramatic normal disturbances. The authors study the elemental ideas that ascertain surroundings improvement and follow the overall principles to the pressing functional want for selling the reclamation of broken lands. Written for ecologists taken with disturbance, panorama dynamics, recovery, lifestyles histories, invasions, modeling, soil formation and group or inhabitants dynamics, this ebook additionally serves as an authoritative textual content for graduate scholars and as a worthy reference for execs fascinated with land administration.

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Plants and animals can also create or exacerbate disturbances in many ways. Invasive plants can alter disturbance regimes by increasing or decreasing fire frequency, erosion or herbivore resistance compared to pre-invasion plant communities (Walker & Smith, 1997; Ehrenfeld & Scott, 2001). For example, if an invasive tree species is more shallow-rooted than the species it replaces, erosion may be promoted (Versfeld & van Wilgen, 1986) and the possibility of primary succession increased. g. g. g. beaver dams) and dying (Willig & McGinley, 1999).

G. in Puerto Rico based on duration and amount of rainfall; Larsen & Simon, 1993), but those associated with volcanoes (lahars, debris flows, mudflows) are sudden. Huge, underwater landslides off the 28 · 2 Denudation Fig. 6. Underwater avalanches (crosshatched) in the ocean surrounding the islands of Hawaii (solid). Modified from G. Walker (1994). c University of Hawaii Press. Hawaiian Islands probably caused the tsunamis that deposited limestone debris more than 300 m above sea level on the island of Lanai (Fig.

Limestone). Where soils have formed they tend to be moderately fertile, with nutrient input from birds and water input from seeps. A. 2 on dispersal mechanisms) or on flat-topped South American mountains called tepuis (Michelangeli, 2000). Frequent erosion or shallow soils can maintain rock outcrop communities at early stages of succession, promote endemism and reduce the likelihood that adjacent forest vegetation establishes (Wiser & White, 1999). , 2000). 2 Air Wind can be the primary agent of disturbance when it uproots trees (see above) or transports particles that form new surfaces such as dunes, or when it has secondary impacts such as creating waves that damage coral reefs.

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