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      A meta-analysis of experimental warming effects on terrestrial nitrogen pools and dynamics.

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          Abstract

          Global warming may have profound effects on terrestrial ecosystems. However, a comprehensive evaluation of the effects of warming on ecosystem nitrogen (N) pools and dynamics is not available. Here, we compiled data of 528 observations from 51 papers and carried out a meta-analysis of experimental warming effects on 13 variables related to terrestrial N pools and dynamics. We found that, on average, net N mineralization and net nitrification rate were increased by 52.2 and 32.2%, respectively, under experimental warming treatment. N pools were also increased by warming, although the magnitude of this increase was less than that of N fluxes. Soil microbial N and N immobilization were not changed by warming, probably because microbes are limited by carbon sources. Grassland and shrubland/heathland were less responsive to warming than forest, probably because the reduction of soil moisture by warming offset the temperature effect in these areas. Soil heating cable and all-day treatment appeared to be the most effective method on N cycling among all treatment methods. Results of this meta-analysis are useful for better understanding the response of N cycling to global warming and the underlying mechanism of warming effects on plants and ecosystem functions.

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          Author and article information

          Journal
          New Phytol.
          The New phytologist
          1469-8137
          0028-646X
          Jul 2013
          : 199
          : 2
          Affiliations
          [1 ] State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110164, China. baie@iae.ac.cn
          Article
          10.1111/nph.12252
          23550663
          164321b0-2c27-4e39-be28-8d8491dad926
          © 2013 Chinese Academy of Science. New Phytologist © 2013 New Phytologist Trust.
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