Šantrůček J, Kubásek J, Janová J, ŠantrůčKOvá H, Altman J, Tumajer J, Hrádková M, Cienciala E
Faculty of Science, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic.
Institute of Botany, AS CR, Zámek 1, 252 43 Průhonice, Czech Republic.
Photosynthetica. 2025 Mar 13;63(1):51-63. doi: 10.32615/ps.2025.006. eCollection 2025.
The strategies of Norway spruce [ (L.) Karst.] to increasing atmospheric CO concentration ( ) are not entirely clear. Here, we reconstructed centennial trajectories of leaf internal CO concentration ( ) and intrinsic water-use efficiency (WUE) from the amount of C in tree-ring cellulose. We collected 57 cores across elevations, soil, and atmospheric conditions in central Europe. Generally, WUE and increased over the last 100 years and the / ratio remained almost constant. However, two groups were distinguished. The first group showed a quasi-linear response to and the sensitivity of to ( = d /d ) ranged from 0 to 1. Trees in the second group showed nonmonotonic responses with extremes during the peak of industrial air pollution in the 1980s and increase from -1 to +1.6. Our study shows a marked attenuation of the rise in WUE during the 20 century leading to invariant WUE in recent decades.
挪威云杉[（L.）Karst.]应对大气二氧化碳浓度（）升高的策略尚不完全清楚。在此，我们根据树木年轮纤维素中的碳含量重建了叶片内部二氧化碳浓度（）和内在水分利用效率（WUE）的百年轨迹。我们在中欧不同海拔、土壤和大气条件下收集了57个岩芯。总体而言，过去100年中WUE和升高，且/比率几乎保持不变。然而，可区分出两组。第一组对呈现准线性响应，对的敏感性（= d/d）范围为0至1。第二组树木呈现非单调响应，在20世纪80年代工业空气污染高峰期出现极值，且从-1增加到+1.6。我们的研究表明，20世纪期间WUE升高明显减弱，导致近几十年来WUE不变。
