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Unformatted text preview: . • The weight accorded nutrient enrichment depends on whether the nutrient which is added is the limiting one in the ecosystem in question . This can only be decided if the contributions from compounds containing N and P are treated separately in the calculation of their potentials. 2 • It is also possible for the sake of simplicity to operate with only one potential for nutrient enrichment . The two nutrient enrichment potentials must then be combined, which requires an assumption of a fixed relative strength of the contributions from N and P, which must be independent of the type and sensitivity of the ecosystem which is exposed. • As for several of the other potential environmental impacts, the potentials for nutrient enrichment are expressed as an equivalent quantity of a reference substance. 3...
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- Winter '11