Responses of ecosystem CO 2 fluxes to short-term experimental warming and nitrogen enrichment in an Alpine meadow, northern Tibet Plateau.
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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DOI：
10.1155/2013/415318
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发表时间：
2013
影响因子：
--
通讯作者：
Shen Z
中科院分区：
文献类型：
--
作者：
Zong N;Shi P;Jiang J;Song M;Xiong D;Ma W;Fu G;Zhang X;Shen Z
在过去的几十年里，青藏高原经历了明显的变暖，但变暖对高山生态系统的影响程度取决于变暖与其他有影响力的全球变化因素（如氮沉降）的相互作用。通过长期增温和氮素调控试验，研究了增温和氮素沉降对高寒草甸植被的影响。使用开顶室来模拟升温。设置了N添加、加温、N添加×加温和对照。在OTCs中，白天的空气和土壤温度分别比环境温度高出2.0°C和1.6°C，但土壤湿度下降了4.95 m3 m−3。氮增加生态系统呼吸（Reco），然而，变暖显着降低Reco。在生长季后期增施氮肥可抵消气候变暖引起的Reco下降。我们的研究结果表明，氮的增加，通过增加土壤氮的有效性和植物生产增强Reco，而变暖减少Reco通过降低土壤水分，土壤氮供应潜力，抑制植物的活动。此外，季节特异性的响应表明，未来全球变化引起的变暖和氮沉降可能会对高寒生态系统的碳循环产生复杂的影响。
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 m3 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.
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