%0 Journal Article
%A Chuankuan WANG
%A Jingjing WANG
%A Nan WANG
%A Xiankui QUAN
%T Responses of Water Use Efficiency in <i>Larix gmelinii</i> to Simulated Climate Warming
%D 2025
%R 10.7525/j.issn.1673-5102.2025.05.004
%J Bulletin of Botanical Research
%P 686-694
%V 45
%N 5
%X <p>Exploring the impact of climate warming on water use efficiency（WUE） of trees<italic/>is significant for understanding the responses of tree carbon-water coupling to climate warming. In 2004， <i>Larix gmelinii</i> seedlings grown in four sites along temperate gradient（e.g.， Tahe， Songling， Sunwu and Dailing） simulating climate warming were transplanted to a common garden（Mao’ershan） near the natural edge of this species’ range. In August 2022， in the common garden and four different transplanting sites， the instantaneous water use efficiency（WUE<sub>i</sub>） and intrinsic water use efficiency（WUE<sub>g</sub>） were measured using the gas exchange method， and long-term water use efficiency（WUE<sub>L</sub>） was calculated via carbon-13 isotope abundance to explore the effects of different simulating climate warming magnitudes on WUE of <i>L. gmelinii</i>. The results showed that both WUE<sub>i </sub>and WUE<sub>g</sub> significantly increased， with an increase of 33.37%， 38.84%， 42.06% and 58.76% for WUE<sub>i</sub>， and an increase of 15.94%， 18.47%， 20.84% and 39.10% for WUE<sub>g </sub>of <i>L. gmelinii</i> under the simulated climate warming by transplantation from the sites Tahe， Songling， Sunwu and Dailing， respectively. The WUE<sub>L</sub> significantly increased by 16.92% and 30.56% for Songling and Tahe， respectively. The increasing rate of WUE<sub>i</sub>， WUE<sub>g</sub> and WUE<sub>L</sub> showed positive linear correlations with the warming magnitude. Both WUE<sub>i</sub> and WUE<sub>g </sub>showed significant and similar site differences in the common garden and among the transplanting sites， while WUE<sub>L</sub> showed significant differences only among the transplanting sites. WUE<sub>i</sub> was sensitive to all the warming magnitudes， but WUE<sub>L</sub> was sensitive only to the high warming magnitude. Therefore， the warming magnitude and the determining methods should be taken into consideration in tree WUE responses to climate warming.</p>
%U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2025.05.004