ZhangRossiHuangEtAl2018
Référence
Zhang, S., Rossi, S., Huang, J.-G., Jiang, S., Yu, B., Zhang, W., Ye, Q. (2018) Intra-annual Dynamics of Xylem Formation in Liquidambar formosana Subjected to Canopy and Understory N Addition. Frontiers in Plant Science, 9(PMC5808591):79. (URL 
)
Résumé
Increasing N deposition caused by intensive anthropogenic activities is expected to affect forest growth. However, the effects of N deposition on trees are still controversial due to the wide variability in results and experimental methods used. We conducted an experiment involving both canopy and understory N addition to investigate the effects of N-addition on intra-annual xylem formation of Chinese sweetgum (Liquidambar formosana) in a warm-temperate forest of Central China. Since 2013, 50 kg N ha(-1) year(-1) (2.5 times the current natural N deposition) was applied monthly from April to December. In 2014 and 2015, the timing and dynamics of xylem formation were monitored weekly during March-December by microcoring the stems of control and treated trees. Similar dynamics of wood formation were observed between canopy and understory N addition. Xylem formation of all the experimental trees started in March and lasted for 119-292 days. Compared to the control, no change was observed in the timing and dynamics of wood formation in N-treated trees. Tree ring-width ranged between 1701 and 4774 μm, with a rate of xylem production of 10.52-26.64 μm day(-1). The radial growth of trees was not modified by the treatments. Our findings suggest that short-term N addition is unable to affect the dynamics of xylem formation in Chinese sweetgum in Central China. The effects of N on tree growth observed in previous studies might be related to the duration of the experiment or the imbalance between the amount of natural deposition and N added during treatments.
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@ARTICLE { ZhangRossiHuangEtAl2018,
AUTHOR = { Zhang, S. and Rossi, S. and Huang, J.-G. and Jiang, S. and Yu, B. and Zhang, W. and Ye, Q. },
TITLE = { Intra-annual Dynamics of Xylem Formation in Liquidambar formosana Subjected to Canopy and Understory N Addition },
JOURNAL = { Frontiers in Plant Science },
YEAR = { 2018 },
VOLUME = { 9 },
NUMBER = { PMC5808591 },
PAGES = { 79 },
MONTH = { jan },
ISSN = { 1664-462X },
ABSTRACT = { Increasing N deposition caused by intensive anthropogenic activities is expected to affect forest growth. However, the effects of N deposition on trees are still controversial due to the wide variability in results and experimental methods used. We conducted an experiment involving both canopy and understory N addition to investigate the effects of N-addition on intra-annual xylem formation of Chinese sweetgum (Liquidambar formosana) in a warm-temperate forest of Central China. Since 2013, 50 kg N ha(-1) year(-1) (2.5 times the current natural N deposition) was applied monthly from April to December. In 2014 and 2015, the timing and dynamics of xylem formation were monitored weekly during March-December by microcoring the stems of control and treated trees. Similar dynamics of wood formation were observed between canopy and understory N addition. Xylem formation of all the experimental trees started in March and lasted for 119-292 days. Compared to the control, no change was observed in the timing and dynamics of wood formation in N-treated trees. Tree ring-width ranged between 1701 and 4774 μm, with a rate of xylem production of 10.52-26.64 μm day(-1). The radial growth of trees was not modified by the treatments. Our findings suggest that short-term N addition is unable to affect the dynamics of xylem formation in Chinese sweetgum in Central China. The effects of N on tree growth observed in previous studies might be related to the duration of the experiment or the imbalance between the amount of natural deposition and N added during treatments. },
COMMENT = { 29467775[pmid] },
DATABASE = { PMC },
DOI = { http://dx.doi.org/10.3389/fpls.2018.00079 },
OWNER = { Daniel Lesieur },
PUBLISHER = { Frontiers Media S.A. },
TIMESTAMP = { 2018-08-30 },
URL = { http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5808591/ },
}
