Uncertainties associated with the assessment of vegetation

摘要: The Environmental Impact Statement (EIS) attempts to portray the current character of a given ecosystem. This provides “Baseline” against which future possible changes can be assessed. Ecosystems, however, are dynamic and in constant state change. Consequently, data representing single year reflect conditions only for that misleading if compared any other year. In addition this temporal variation, considerable spacial variation exists species composition cover. Ample sampling is required compensate heterogeneity. Variation, or background “noise,” minimized by use similarity indexes over period at least two years.