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Climatic impact of land use in LCA—carbon transfers between vegetation/soil and air

Content Provider	Springer Nature Link
Author	Müller Wenk, Ruedi Brandão, Miguel
Copyright Year	2010
Abstract	Human use of land areas leads to impacts on nature in several ways. Within the framework of the UNEP/SETAC Life Cycle Initiative, it was stated that life cycle assessment (LCA) of land use should assess at least the impact on biodiversity, the impact on biotic production, and the impact on the regulating functions of the natural environment. This study focuses on the climatic impact of land use as determined by the CO$_{2}$ transfers between vegetation/soil and the atmosphere in the course of terrestrial release and re-storage of carbon.Compared with the potential natural vegetation as a baseline, areas getting transformed by man (land transformations) as well as areas forced to maintain their current non-natural state (land occupations) may store reduced amounts of carbon in soil and vegetation, whereby the mobilized carbon is essentially transferred to the atmosphere in form of CO$_{2}$, contributing to global warming. The size of this climatic impact is determined by the amount of carbon transferred per hectare, as well as by the duration of the carbon’s stay in air. Generally, we consider this duration as limited by spontaneous reversal of vegetation and soil toward a quasi-natural form as soon as human land use ends. Taking the mean stay in air of 1 ton carbon from fossil fuel combustion as a basis of comparison, 1 ton carbon released by, e.g., a forest-to-cropland transformation can be adequately weighted by considering the timing of carbon backflow from air to the spontaneously regrowing forest.Carbon transfers to the air per hectare, as well as imputable durations of carbon stay in air, are determined for the most important types of land transformation and land occupation, for locations in any of the terrestrial biomes of tropical forest, temperate forest, boreal forest, tropical grassland, and temperate grassland. The carbon quantities are expressed as “fossil-combustion-equivalent” tons of carbon so that they can be summed up with carbon amounts from fossil fuel combustion into the usual LCA indicator for global warming potential.The results confirm that on a per hectare basis, transforming forests into cropland has a more serious climatic effect than continuing to occupy such land as cropland for one additional year. But on a global basis, maintaining current cropland areas for one additional year is a serious driver of global warming due to the huge area of croplands in zones where forest would be the natural vegetation. Furthermore, forest-to-cropland transformations cause carbon transfers to air per hectare of roughly similar size in tropical, temperate, or boreal zones, but due to slow forest restoration, transformation of boreal forests has a stronger influence on global warming.The results of this study facilitate a worldwide impact assessment of land use with respect to global warming. Together with the two separate studies covering the impacts of land use on biodiversity and on biotic production, a tool will be available for a reasonably complete LCA of land use at global level. However, the data quality needs further improvement.
Starting Page	172
Ending Page	182
Page Count	11
File Format	PDF
ISSN	09483349
Journal	The International Journal of Life Cycle Assessment
Volume Number	15
Issue Number	2
e-ISSN	16147502
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-01-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon flows Carbon stocks GWP Impact indicator Land occupation Land transformation Land use Land use change Potential natural vegetation Environmental Economics Environment
Content Type	Text
Resource Type	Article
Subject	Environmental Science

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