Chin J Plant Ecol ›› 2014, Vol. 38 ›› Issue (4): 343-354.DOI: 10.3724/SP.J.1258.2014.00031
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XIAO Qun-Ying1,2, YIN Chun-Ying1,*(), PU Xiao-Zhen1,2, QIAO Ming-Feng1,2, LIU Qing1
Received:
2013-11-04
Accepted:
2014-02-07
Online:
2014-11-04
Published:
2014-04-08
Contact:
YIN Chun-Ying
XIAO Qun-Ying, YIN Chun-Ying, PU Xiao-Zhen, QIAO Ming-Feng, LIU Qing. Ecophysiological characteristics of leaves and fine roots in dominant tree species in a subalpine coniferous forest of western Sichuan during seasonal frozen soil period[J]. Chin J Plant Ecol, 2014, 38(4): 343-354.
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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2014.00031
Fig. 1 Daily fluctuation of air temperature, ground surface temperature, soil temperature at 5 cm soil depth and air relative humidity in the sample plot.
Fig. 2 Changes in malondialdehyde (MDA) content in leaves and fine roots of Abies fargesii var. faxoniana (A) and Picea asperata (B) during seasonal frozen soil period (mean ± SD, n = 5). Different lowercase letters above the error bars indicate significant differences in leaves between the freezing and freezing-thawing periods (p < 0.05); different capital letters above the error bars indicate significant differences in fine roots between the freezing and freezing-thawing periods (p < 0.05). Asterisks indicate significant differences between leaves and fine roots over the same period (***, p < 0.005; **, p < 0.01; *, p < 0.05).
Fig. 3 Changes in peroxidase (POD) activity in leaves and fine roots of Abies fargesii var. faxoniana (A) and Picea asperata (B) during seasonal frozen soil period (mean ± SD, n = 5). Different lowercase letters above the error bars indicate significant differences in leaves between the freezing and freezing-thawing periods (p < 0.05); the same capital letters above the error bars indicate no significant differences in fine roots between the freezing and freezing-thawing periods (p > 0.05). Asterisks indicate significant differences between leaves and fine roots over the same period (***, p < 0.005; **, p < 0.01; *, p < 0.05).
Fig. 4 Changes in the contents of osmoregulation substance in leaves and fine roots during seasonal frozen soil period (mean ± SD, n = 5). A, Proline content in Abies fargesii var. faxoniana. B, Proline content in Picea asperata. C, Soluble protein content in Abies fargesii var. faxoniana. D, Soluble protein content in Picea asperata. E, Soluble sugar content in Abies fargesii var. faxoniana. F, Soluble sugar content in Picea asperata. Different lowercase letters above the error bars indicate significant differences in leaves between the freezing and freezing-thawing periods (p < 0.05); different capital letters above the error bars indicate significant differences in fine roots between the freezing and freezing-thawing periods (p < 0.05). Asterisks indicate significant differences between leaves and fine roots over the same period (***, p < 0.005; **, p < 0.01; *, p < 0.05).
Fig. 5 Physiological changes in leaves and fine roots during seasonal frozen soil period (mean ± SD, n = 5). A, Nitrate reductase activity in Abies fargesii var. faxoniana. B, Nitrate reductase activity in Picea asperata. C, Water content of Abies fargesii var. faxoniana. D, Water content in Picea asperata. Different lowercase letters above the error bars indicate significant differences in leaves between the freezing and freezing-thawing periods (p < 0.05); different capital letters above the error bars indicate significant differences in fine roots between the freezing and soil freezing-thawing periods (p < 0.05). Asterisks indicate significant differences between leaves and fine roots over the same period (***, p < 0.005; **, p < 0.01; *, p < 0.05).
Fig. 6 Morphological changes in fine roots of Abies fargesii var. faxoniana and Picea asperata during seasonal frozen soil period (mean ± SD, n = 5). A, Specific root length. B, Specific surface area. C, Diameter. D, Tissue density. The same lowercase letters above the error bars indicate no significant differences in the morphology of fine roots in Abies fargesii var. faxoniana between the freezing and freezing-thawing periods (p > 0.05); the same capital letters above the error bars indicate no significant differences in the of fine roots morphology in Picea asperata between the freezing and freezing-thawing periods (p > 0.05).
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