 |
| Titel |
CO2 enrichment increases nutrient leaching from model forest ecosystems in subtropical China |
| VerfasserIn |
J. X. Liu, D. Q. Zhang, G. Y. Zhou, B. Faivre-Vuillin, Q. Deng, C. L. Wang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 6 ; Nr. 5, no. 6 (2008-12-23), S.1783-1795 |
| Datensatznummer |
250002941
|
| Publikation (Nr.) |
 copernicus.org/bg-5-1783-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| The effect of high atmospheric CO2 concentrations on
the dynamics of mineral nutrient is not well documented, especially for
subtropical China. We used model forest ecosystems in open-top chambers to
study the effects of CO2 enrichment alone and together with N addition
on the dynamics of soil cations and anions. Two years of exposure to a 700 ppm CO2
atmospheric concentration resulted in increased annual nutrient
losses by leaching below 70 cm soil profile. Compared to the control, net
Mg2+ losses increased by 385%, K+ by 223%, Ca2+ by
167% and NO3−-N by 108%, respectively. Increased losses
following exposure to elevated CO2 were related to both faster
weathering of minerals/organic matter decomposition and greater amounts of
leaching water. Net annual nutrient losses in the high CO2
concentration chambers reached 22.2 kg ha−1 year−1 for K+,
171.3 kg ha−1 year−1 for Ca2+, 8.2 kg ha−1 year−1
for Mg2+ and about 2 kg ha−1 year−1 for NO3−-N. The
N addition alone had no significant effect on the mineral nutrient leaching
losses. However, addition of N together with the high CO2 treatment
significantly reduced mineral nutrient losses.We hypothesize that forests in
subtropical China might suffer from nutrient limitation and reduction in
plant biomass under elevated CO2 concentration due to mineral leaching
losses in the future. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|