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. Variations in precipitation and atmospheric N deposition affect water and Navailability in desert and thus may have significant effects on desertecosystems. Haloxylon ammodendron is a dominant plant in Asian desert, and addressing itsphysiological acclimatization to the changes in precipitation and Ndeposition can provide insight into how desert plants adapt to extremeenvironments by physiological adjustment. Carbon isotope ratio (δ13C) in plants has been suggested as a sensitive long-term indicatorof physiological acclimatization. Therefore, this study evaluated the effectof precipitation change and increasing atmospheric N deposition on δ13C of H. ammodendron. Furthermore, H. ammodendron is a C4 plant; whether its δ13C can indicate water use efficiency (WUE) has not been addressed. Inthe present study, we designed a field experiment with a completelyrandomized factorial combination of N and water and measured δ13C and gas exchange of H. ammodendron. Then we calculated the degree ofbundle-sheath leakiness (φ) and WUE of the assimilating branches ofH. ammodendron. δ13C and φ remained stable under N and water supply,while N addition, water addition and their interaction affected gas exchangeand WUE in H. ammodendron. In addition, δ13C had no correlation with WUE.These results were associated with the irrelevance between δ13Cand the ratio of intercellular to ambient CO2 concentration(ci / ca), which might be caused by a special value (0.37) of thedegree of bundle-sheath leakiness (φ) or a lower activity ofcarbonic anhydrase (CA) of H. ammodendron. In conclusion, δ13C of H. ammodendron is notsensitive to global change in precipitation and atmospheric N depositionand cannot be used for indicating its WUE.

biogeosciences

Evaluating the response of &amp;lt;i&amp;gt;δ&amp;lt;/i&amp;gt;&amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C in &amp;lt;i&amp;gt;Haloxylon ammodendron&amp;lt;/i&amp;gt;, a dominant C&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; species in Asian desert ecosystems, to water and nitrogen addition as well as the availability of its &amp;lt;i&amp;gt;δ&amp;lt;/i&amp;gt;&amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C as an indicator of water use efficiency