光合作用
氮气
蒸腾作用
营养物
农学
气孔导度
用水效率
木质部
光合能力
生物量(生态学)
环境科学
化学
含水量
生长季节
作者
Jobin Joseph,Jörg Luster,Alessandra Bottero,Nathalie Buser,Lukas Baechli,Krunoslav Sever,Arthur Gessler
出处
期刊:Tree Physiology
[Oxford University Press]
日期:2021-06-07
卷期号:41 (6): 927-943
被引量:1
标识
DOI:10.1093/treephys/tpaa146
摘要
Research on drought impact on tree functioning is focussed primarily on water and carbon (C) dynamics. Changes in nutrient uptake might also affect tree performance under drought and there is a need to explore underlying mechanisms. We investigated effects of drought on (a) in situ nitrogen (N) uptake, accounting for both, N availability to fine roots in soil and actual N uptake, (b) physiological N uptake capacity of roots and (c) the availability of new assimilates to fine roots influencing the N uptake capacity using 15N and 13C labelling. We assessed saplings of six different tree species (Acer pseudoplatanus L., Fagus sylvatica L., Quercus petraea (Mattuschka) Liebl., Abies alba Mill., Picea abies (L.) H.Karst. and Pinus sylvestris L.). Drought resulted in significant reduction of in situ soil N uptake in deciduous trees accompanied by reduced C allocation to roots and by a reduction in root biomass available for N uptake. Although physiological root N uptake capacity was not affected by drought in deciduous saplings, reduced maximum ammonium but not nitrate uptake was observed for A. alba and P. abies. Our results indicate that drought has species-specific effects on N uptake. Even water limitations of only 5 weeks as assessed here can decrease whole-plant inorganic N uptake, independent of whether the physiological N uptake capacity is affected or not.
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