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. The nitrogen-15 (15N) natural abundance composition(δ15N) in soils or plants is a useful tool to indicate theopenness of ecosystem N cycling. This study aimed to evaluate theinfluence of the experimental warming on soil and plant δ15N.We applied a global meta-analysis method to synthesize 79 and 76 pairedobservations of soil and plant δ15N from 20 published studies,respectively. Results showed that the mean effect sizes of the soil andplant δ15N under experimental warming were −0.524 (95 % CI (confidence interval):−0.987 to −0.162) and 0.189 (95 % CI: −0.210 to 0.569), respectively. Thisindicated that soil δ15N had negative response to warming atthe global scale, where warming had no significant effect on plant δ15N. Experimental warming significantly (p&lt;0.05) decreasedsoil δ15N in Alkali and medium-textured soils, ingrassland/meadow, under air warming, for a 4–10-year warming period and for anincrease of &gt;3 ∘C in temperature, whereas it significantly(p&lt;0.05) increased soil δ15N in neutral andfine-textured soils and for an increase of 1.5–3 ∘C in temperature.Plant δ15N significantly (p&lt;0.05) increased withincreasing temperature in neutral and fine-textured soils and significantly(p&lt;0.05) decreased in alkali soil. Latitude did not affect thewarming effects on both soil and plant δ15N. However, thewarming effect on soil δ15N was positively controlled by themean annual temperature, which is related to the fact that the highertemperature can strengthen the activity of soil microbes. The effect ofwarming on plant δ15N had weaker relationships withenvironmental variables compared with that on soil δ15N. Thisimplied that soil δ15N was more effective than plant δ15N in indicating the openness of global ecosystem N cycling.

soil

Soil &amp;lt;i&amp;gt;δ&amp;lt;/i&amp;gt;&amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N is a better indicator of ecosystem nitrogen cycling than plant &amp;lt;i&amp;gt;δ&amp;lt;/i&amp;gt;&amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N: A global meta-analysis