GSTDTAP  > 气候变化
DOI10.1111/gcb.14555
Lower photorespiration in elevated CO2 reduces leaf N concentrations in mature Eucalyptus trees in the field
Wujeska-Klause, Agnieszka1; Crous, Kristine Y.1; Ghannoum, Oula1,2; Ellsworth, David S.1
2019-04-01
发表期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
EISSN1365-2486
出版年2019
卷号25期号:4
文章类型Article
语种英语
国家Australia
英文摘要

Rising atmospheric CO2 concentrations is expected to stimulate photosynthesis and carbohydrate production, while inhibiting photorespiration. By contrast, nitrogen (N) concentrations in leaves generally tend to decline under elevated CO2 (eCO(2)), which may reduce the magnitude of photosynthetic enhancement. We tested two hypotheses as to why leaf N is reduced under eCO(2): (a) A "dilution effect" caused by increased concentration of leaf carbohydrates; and (b) inhibited nitrate assimilation caused by reduced supply of reductant from photorespiration under eCO(2). This second hypothesis is fully tested in the field for the first time here, using tall trees of a mature Eucalyptus forest exposed to Free-Air CO2 Enrichment (EucFACE) for five years. Fully expanded young and mature leaves were both measured for net photosynthesis, photorespiration, total leaf N, nitrate (NO3-) concentrations, carbohydrates and NO3- reductase activity to test these hypotheses. Foliar N concentrations declined by 8% under eCO(2) in new leaves, while the NO3- fraction and total carbohydrate concentrations remained unchanged by CO2 treatment for either new or mature leaves. Photorespiration decreased 31% under eCO(2) supplying less reductant, and in situ NO-3 reductase activity was concurrently reduced (-34%) in eCO(2), especially in new leaves during summer periods. Hence, NO3- assimilation was inhibited in leaves of E. tereticornis and the evidence did not support a significant dilution effect as a contributor to the observed reductions in leaf N concentration. This finding suggests that the reduction of NO3- reductase activity due to lower photorespiration in eCO(2) can contribute to understanding how eCO(2)-induced photosynthetic enhancement may be lower than previously expected. We suggest that large-scale vegetation models simulating effects of eCO(2) on N biogeochemistry include both mechanisms, especially where NO3- is major N source to the dominant vegetation and where leaf flushing and emergence occur in temperatures that promote high photorespiration rates.


英文关键词carbohydrates EucFACE leaf age nitrate nitrate reductase nitrogen assimilation photorespiration photosynthesis
领域气候变化 ; 资源环境
收录类别SCI-E
WOS记录号WOS:000462295200001
WOS关键词NITRATE REDUCTASE-ACTIVITY ; PROGRESSIVE NITROGEN LIMITATION ; CARBON-DIOXIDE ; FOREST PRODUCTIVITY ; ENRICHMENT FACE ; ATMOSPHERIC CO2 ; RISING CO2 ; PHOTOSYNTHESIS ; ASSIMILATION ; RESPONSES
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/182108
专题气候变化
资源环境科学
作者单位1.Western Sydney Univ, Hawkesbury Inst Environm, Penrith, NSW, Australia;
2.Western Sydney Univ, Translat Photosynth Ctr Excellence, Penrith, NSW, Australia
推荐引用方式
GB/T 7714
Wujeska-Klause, Agnieszka,Crous, Kristine Y.,Ghannoum, Oula,et al. Lower photorespiration in elevated CO2 reduces leaf N concentrations in mature Eucalyptus trees in the field[J]. GLOBAL CHANGE BIOLOGY,2019,25(4).
APA Wujeska-Klause, Agnieszka,Crous, Kristine Y.,Ghannoum, Oula,&Ellsworth, David S..(2019).Lower photorespiration in elevated CO2 reduces leaf N concentrations in mature Eucalyptus trees in the field.GLOBAL CHANGE BIOLOGY,25(4).
MLA Wujeska-Klause, Agnieszka,et al."Lower photorespiration in elevated CO2 reduces leaf N concentrations in mature Eucalyptus trees in the field".GLOBAL CHANGE BIOLOGY 25.4(2019).
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