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Responses of Ecosystem CO 2 Fluxes to Short‐Term Experimental Warming and Nitrogen Enrichment in an Alpine Meadow, Northern Tibet Plateau
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Responses of Ecosystem CO 2 Fluxes to Short‐Term Experimental Warming and Nitrogen Enrichment in an Alpine Meadow, Northern Tibet Plateau
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Responses of Ecosystem CO 2 Fluxes to Short‐Term Experimental Warming and Nitrogen Enrichment in an Alpine Meadow, Northern Tibet Plateau
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Journal Article
Responses of Ecosystem CO 2 Fluxes to Short‐Term Experimental Warming and Nitrogen Enrichment in an Alpine Meadow, Northern Tibet Plateau
2013
Overview
Over the past decades, the Tibetan Plateau has experienced pronounced warming, yet the extent to which warming will affect alpine ecosystems depends on how warming interacts with other influential global change factors, such as nitrogen (N) deposition. A long‐term warming and N manipulation experiment was established to investigate the interactive effects of warming and N deposition on alpine meadow. Open‐top chambers were used to simulate warming. N addition, warming, N addition × warming, and a control were set up. In OTCs, daytime air and soil temperature were warmed by 2.0°C and 1.6°C above ambient conditions, but soil moisture was decreased by 4.95 m 3 m −3 . N addition enhanced ecosystem respiration (Reco); nevertheless, warming significantly decreased Reco. The decline of Reco resulting from warming was cancelled out by N addition in late growing season. Our results suggested that N addition enhanced Reco by increasing soil N availability and plant production, whereas warming decreased Reco through lowering soil moisture, soil N supply potential, and suppression of plant activity. Furthermore, season‐specific responses of Reco indicated that warming and N deposition caused by future global change may have complicated influence on carbon cycles in alpine ecosystems.
