In simulation studies of Arabic coffee plants under the future CO 2 conditions, no data about flowering, yield fractions or beverage sensorial have been reported. It was hypothesized that elevated CO 2 (e[CO 2 ]) would improve the leaf-gas exchange responses, assisting in improvement of coffee reproduction. The aim was to estimate leaf-gas exchange dynamics, flowering, fruiting intensity and quality in Coffea arabica grown in long-term FACE experiment under rainfed conditions. Leaf-gas exchanges were followed for five years during vegetative and reproductive stages; flowering was observed at second order axis scale for 4 years; berry production, its fractions and beverage sensorial were estimated at plot scale in the 4th production year under FACE. Young coffee plants did not modify leaf-gas exchange responses under e[CO 2 ] in observed periods, while the adult ones increased leaf-photosynthesis in all observed stages. Stomatal conductance and water use efficiency were higher under e[CO 2 ] than actual [CO 2 ] in some stages of flowering, berry expansion and ripping, benefited from higher water content over the soil profile in advanced years of FACE. Elevated CO 2 mitigated the effects of anomalous drought and high temperatures in rainy season, reducing the abnormal reproductive structures rate. Under e[CO 2 ], the intense leaf-photosynthesis did not improve the yield or sensorial beverage quality in 4th production year, but a fraction of green berries, indicating flowering delay or prolongated ripening. The e[CO 2 ] supported species survival during short intensive drought through high carbon investments in reproduction, while long/anomalous droughts reduced the fraction of flower abnormalities, indicating carbon investments in individual plant survival.

中文翻译：

---

在长期 FACE 实验中，营养生长有助于阿拉伯咖啡树的繁殖反应

在未来 CO 2 条件下对阿拉伯咖啡植物的模拟研究中，没有报告有关开花、产量分数或饮料感官的数据。据推测，升高的 CO 2 (e[CO 2 ]) 会改善叶气交换反应，有助于改善咖啡繁殖。目的是评估在雨养条件下长期 FACE 实验中种植的小粒咖啡的叶气交换动态、开花、结果强度和质量。在营养和繁殖阶段进行了五年的叶气交换；在二阶轴尺度上观察到开花4年；在 FACE 下的第 4 个生产年中，在地块规模上估计了浆果产量、其馏分和饮料感官。在观察期间，年轻的咖啡植物在 e[CO 2 ] 下没有改变叶气交换反应，而成虫在所有观察到的阶段都增加了叶片光合作用。在开花、浆果扩张和撕裂的某些阶段，e[CO 2 ] 下的气孔导度和水分利用效率高于实际 [CO 2 ]，这得益于 FACE 晚期土壤剖面上更高的含水量。CO 2 升高减轻了雨季异常干旱和高温的影响，降低了异常生殖结构率。在 e[CO 2 ] 下，强烈的叶片光合作用并没有提高第 4 个生产年的产量或感官饮料质量，而是少量的绿色浆果，表明开花延迟或成熟时间延长。e[CO 2 ] 通过对繁殖的高碳投资支持物种在短期密集干旱期间的生存，