Anthropogenic NOx emissions alter the intrinsic water-use efficiency (WUEi) for Quercus cerris stands under Mediterranean climate conditions.
Anthropogenic NOx emissions alter the intrinsic water-use efficiency (WUEi) for Quercus cerris stands under Mediterranean climate conditions.
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DOI：
10.1016/j.envpol.2010.06.017
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发表时间：
2010-09
影响因子：
8.9
通讯作者：
R. Guerrieri;R. Siegwolf;M. Saurer;F. Ripullone;Maurizio Mencuccini;M. Borghetti
中科院分区：
文献类型：
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作者：
R. Guerrieri;R. Siegwolf;M. Saurer;F. Ripullone;Maurizio Mencuccini;M. Borghetti
我们调查了氮沉降（Ndep）对内在水分利用效率（WUEI）的影响，光合作用（A）气孔导度（GS）的比率，为两个在不同距离的意大利南部的炼油厂栎cerris站。我们利用树木年轮中的δ 13 C来评估WUEI的变化，而气候和NOx排放的影响分别通过δ 18 O和δ 15 N来探讨。两个站点之间的差异WUEi是显着的，与树木暴露于不同程度的氮氧化物排放量显示出突然增加的污染。假设两个样点的gsat相似，根据δ 18 O推断，污染点较高的N有效性导致A/gs比向有利于A的方向移动。总的来说，我们的研究结果表明，Ndep的增加可能会提高树木WUE的情况下，减少降水预测地中海地区。
We investigated the effect of N deposition (Ndep) on intrinsic water-use efficiency (WUEi), the ratio of photosynthesis (A) to stomatal conductance (gs), for two Quercus cerris stands at different distances to an oil refinery in Southern Italy. We used δ13C in tree rings for assessing changes in WUEi; while the influence of climate and NOxemission was explored through δ18O and δ15N, respectively. Differences in WUEibetween the two sites were significant, with trees exposed to different degrees of NOxemissions showing an abrupt increase with the onset of pollution. Assuming similar gsat the two sites, as inferred through δ18O, the higher N availability at the polluted site caused the shift of the A/gsratio in favour of A. Overall, our result suggests that an increase of Ndep may enhance tree WUE under a scenario of reduction of precipitation predicted for Mediterranean area.