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| Titel |
Multi-factor controls on terrestrial carbon dynamics in urbanized areas |
| VerfasserIn |
C. Zhang, H. Tian, S. Pan, G. Lockaby, A. Chappelka |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 24 ; Nr. 11, no. 24 (2014-12-16), S.7107-7124 |
| Datensatznummer |
250117738
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| Publikation (Nr.) |
 copernicus.org/bg-11-7107-2014.pdf |
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| Zusammenfassung |
| As urban land expands rapidly across the globe, much concern has been raised
that urbanization may alter the terrestrial carbon cycle. Urbanization
involves complex changes in land structure and multiple environmental
factors. Little is known about the relative contribution of these individual
factors and their interactions to the terrestrial carbon dynamics, however,
which is essential for assessing the effectiveness of carbon sequestration
policies focusing on urban development. This study developed a comprehensive
analysis framework for quantifying relative contribution of individual
factors (and their interactions) to terrestrial carbon dynamics in urbanized
areas. We identified 15 factors belonging to five categories, and we
applied a newly developed factorial analysis scheme to the southern United
States (SUS), a rapidly urbanizing region. In all, 24 numeric experiments were
designed to systematically isolate and quantify the relative contribution of
individual factors. We found that the impact of land conversion was far larger
than other factors. Urban managements and the overall interactive effects
among major factors, however, created a carbon sink that compensated for
42% of the carbon loss in land conversion. Our findings provide valuable
information for regional carbon management in the SUS: (1) it is preferable
to preserve pre-urban carbon pools than to rely on the carbon sinks in urban
ecosystems to compensate for the carbon loss in land conversion. (2) In
forested areas, it is recommendable to improve landscape design (e.g., by
arranging green spaces close to the city center) to maximize the
urbanization-induced environmental change effect on carbon sequestration.
Urbanization-induced environmental change will be less effective in
shrubland regions. (3) Urban carbon sequestration can be significantly
improved through changes in management practices, such as increased
irrigation and fertilizer and targeted use of vehicles and machinery with
least-associated carbon emissions. |
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