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| Titel |
Extreme rainfall events can alter inter-annual biomass responses to water and N enrichment |
| VerfasserIn |
D. L. Kong, X. T. Lü, L. L. Jiang, H. F. Wu, Y. Miao, P. Kardol |
| 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 ; 10, no. 12 ; Nr. 10, no. 12 (2013-12-11), S.8129-8138 |
| Datensatznummer |
250085470
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| Publikation (Nr.) |
 copernicus.org/bg-10-8129-2013.pdf |
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| Zusammenfassung |
| Water availability has profound effects on plant growth
and productivity in temperate and semiarid grasslands. However, it remains
unclear how variation of inter-annual precipitation by extreme rainfall
events will alter the aboveground and belowground responses of plants, and
how these responses may be contingent on N availability. In this
study, we examined the interactive effects of inter-annual precipitation
variation and N addition on aboveground and live fine root biomass of a
semiarid grassland in northern China for two consecutive years (2007 and
2008). Inter-annual variation in precipitation resulting mainly
from the occurrence of extreme rainfall events in 2008 significantly
affected above- and belowground plant biomass responses to water addition.
In addition, variation of inter-annual precipitation by this extreme
rainfall event suppressed plant responses to nitrogen addition and reduced
the interaction effects between water and nitrogen addition. These effects
of inter-annual precipitation fluctuation could be attributed to the
negative influence of the extreme rainfall event on soil N and water
availability, ultimately reducing plant rainfall use efficiency and nitrogen
use efficiency. In conclusion, our results suggest ecosystem
responses to water and N enrichment could be altered by inter-annual
variation of precipitation regime caused by the naturally occurring extreme
rainfall events. |
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