Abstract
Purpose
As most of the impact categories modelled in Life Cycle (Impact) Assessment, land use is influenced by an immense number of different impacts forming a complex interaction network. At present, there is no common consensus on the best practice for quantification of land use in LCA. However, land use and its consequences for biodiversity and ecosystem services are currently subject to intense public debate. Here, we review relevant methodology proposed to date with special reference to the hemeroby concept to identify a consistent method that captures the complexity of land use without oversimplification and loss of crucial information.
Methods
The definition of the safeguard subject is of vital importance and predetermines the framework of all methods and requirements for a reliable impact indicator. We selected naturalness as the safeguard subject and identified the hemeroby concept as the most appropriate approach for quantification. The hemeroby concept is particularly well suited for a nuanced assessment of different types of land use management.
Results
With the application of a system of seven ordinal classes, the diversity of naturalness in forestry and agricultural production systems can be adequately characterised. The applicability of the classification system of the hemeroby concept was reviewed and aspects in need of further development and method refinement were identified. Furthermore, the hemeroby concept was compared to other common concepts for the integration of land use into LCIA.
Discussion
The hemeroby concept was identified as an appropriate approach to quantify the safeguard subject naturalness as an LCIA indicator. In addition, it addresses subjects like biodiversity and intact ecosystems. Characterising the quality of utilised land by classes encompassing ranges on an ordinal scale offers considerable merits in comparison with single value systems on a cardinal scale. Such systems tend to oversimplify the highly complex variable land use by assuming a single quantifiable ecological indicator (e.g. soil carbon content or relative α-biodiversity) as representative proxy. In contrast to this, the hemeroby concept offers an approach that is able to retain sufficient complexity of the information available for a particular area, yet condense this information so that it may be modelled for LCA purposes without loss of crucial data.
Conclusions
Among all the methods currently available for the quantification of land use, the hemeroby concept is the most promising in terms of practicality of the actual method and quality of the output data. The classification into hemeroby classes is superior at capturing the complexity of land use. The method has been applied successfully in the area of European forests and agriculture. However, global availability of spatial hemeroby data and their compatibility with the criteria stipulated here needs to be evaluated and further developed as necessary. Other approaches focus on a different safeguard subject, thus narrowing the scope of land use as an impact indicator.
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Notes
Endpoint indicators aim to illustrate the entire causal chain from the emission to the actual final harmful effect. Midpoint indicators are located between emission and final harmful effect. Thus, they are more closely correlated with LCI results. Ideally, midpoint indicators model the primary impact.
Cardinal scale (or metric scale): a scale to distinguish discrete and continuous data, the magnitude of the distance between two values may be justified with logical arguments. Ordinal scale: distinction into qualitative criteria to establish rankings such as greater, smaller, more, less, etc. The distance between the individual classes is not numerically defined.
Definition of composite indicator please see OECD: http://stats.oecd.org/glossary/detail.asp?ID=6278
According to UNEP (2014), 2 % of global land area were developed in 2012. Assuming another percent of devastated area, the total class VII amounts to 3 % For comparison: Within the EU, 8.8 % of the land area is developed (land used for residential, commercial and industrial purposes) http://epp.eurostat.ec.europa.eu/statistics_explained/index.php/Land_cover_and_land_use_statistics_at_regional_level#More_than_8.8.C2.A0.2.5_of_EU_land_used_for_residential.2C_commercial_and_industrial_purposes
Without human intervention, nature would obviously not establish fields for agricultural purposes, but return to the final successional stage depending on the biome, e.g. via ruderal communities and forest succession to mature forest.
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Fehrenbach, H., Grahl, B., Giegrich, J. et al. Hemeroby as an impact category indicator for the integration of land use into life cycle (impact) assessment. Int J Life Cycle Assess 20, 1511–1527 (2015). https://doi.org/10.1007/s11367-015-0955-y
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DOI: https://doi.org/10.1007/s11367-015-0955-y