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| Titel |
Primary production in forests and grasslands of China: contrasting environmental responses of light- and water-use efficiency models |
| VerfasserIn |
H. Wang, I. C. Prentice, J. Ni |
| 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 ; 9, no. 11 ; Nr. 9, no. 11 (2012-11-22), S.4689-4705 |
| Datensatznummer |
250007405
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| Publikation (Nr.) |
 copernicus.org/bg-9-4689-2012.pdf |
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| Zusammenfassung |
| An extensive data set on net primary production (NPP) in China's forests is
analysed with the help of two simple theoretically derived models based on
the light use efficiency (LUE) and water use efficiency (WUE) concepts,
respectively. The two models describe the data equally well, but their
implied responses to [CO2] and temperature differ substantially. These
responses are illustrated by sensitivity tests in which [CO2] is kept
constant or doubled, temperatures are kept constant or increased by 3.5 K,
and precipitation is changed by ±10%. Precipitation changes elicit
similar responses in both models. But NPP in South China, especially, is
reduced by warming in the LUE model, whereas it is increased in the WUE
model. The [CO2] response of the WUE model is much larger than that of
the LUE model. It is argued that the two models provide upper and lower
bounds for this response, with the LUE model more realistic for forests. The
differences between the two models illustrate some potential causes of the
large differences (even in sign) in the global NPP response of different
global vegetation models to temperature and [CO2]. |
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