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

By Lawrence R. Walker

This quantity offers the 1st entire precis of the way plant, animal, and microbial groups enhance lower than the tough stipulations following dramatic average disturbances. The authors research the elemental rules that ensure environment improvement and practice the final principles to the pressing functional want for selling the reclamation of broken lands. Written for ecologists enthusiastic about disturbance, panorama dynamics, recovery, existence histories, invasions, modeling, soil formation and neighborhood or inhabitants dynamics, this ebook additionally serves as an authoritative textual content for graduate scholars and as a important reference for pros curious about land administration.

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Example text

Magnitude includes intensity (the actual physical force, such as the position of an earthquake on the Richter scale), whereas severity is a measure of the damage caused to the biota. The disturbance regime is the cumulative effect of all the various disturbances that affect a certain area. 6) may be synergistic and enhance the frequency, extent or magnitude of the other disturbances. 3 Plants and animals as agents of disturbance Not all disturbances are abiotic in origin. Plants and animals can also create or exacerbate disturbances in many ways.

Dunes Dunes are widespread features of both coastlines and arid interior lands and are principally formed by wind or wind–plant interactions (Fig. 10). Dunes are especially abundant around 30◦ N and S (Rice, 1988). At low latitudes, dunes are less common, owing in part to stabilizing vegetation, low average wind speeds and salt-tolerant vegetation along shorelines (Doing, 1985). Dunes tend to be least common at high latitudes, owing in part to raised shorelines and younger surfaces from recent deglaciation combined with shorter seasons when the soils are not frozen.

2 Types of disturbance · 47 Fig. 16. ) that had been abandoned for 5 yr when the photo was taken in 1998. , 1993) or obstruct drainage and cause flooding. , 1999; see Chapter 7), particularly if the aliens invade off-road communities. , 1995). However, the alien species are most common in agricultural landscapes and do not appear to alter vegetation dynamics beyond road edges in the more natural landscapes. g. , Test Site). Landfills, usually unconsolidated mixtures of inorganic and organic wastes, may also be nutrient-rich surfaces for primary succession, unless they are capped with soil, which would then initiate secondary succession.

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