Impacts of the removal of vascular plants on physiological and biochemical characteristics of Syntrichia caninervis during winter season in a temperate desert

doi:10.17521/cjpe.2015.0441

Abstract

Abstract:

Aims Patchily distributed biological soil crusts and shrubs is one of the main vegetation cover types in Gurbantünggüt desert. The existence of shrubs in desert areas serves not only as a shelter for small animals, but also a good living condition for cryptogams and some herbs. Syntrichia caninervis, a dominant moss species in Gurbantünggüt desert, is patchily distributed under shrub canopy and open spaces between vascular plants. To our knowledge, the impacts of the removal of shrub canopy on physiological and biochemical characteristics of S. caninervis during the winter is still unknown.
Methods We simulated grazing of animals on Ephedra distachya at various rates (shrubs left intact, 50% shrubs removed, and shrubs removed completely) by cutting different percent of above-ground shoots of E. distachya. The shoot water content, chlorophyll fluorescence, proline content, soluble sugar content, soluble protein content, malonyldialdehyde (MDA) content, peroxidase (POD) and superoxide dismutase (SOD) activity were compared.
Important findings The results show that, as for proline and soluble sugar contents of tested S. caninervis, there were no significant differences among three treatments of shrub canopy. However, the MDA content, and the activities of POD, SOD, CAT were significantly higher than nature shrubs in snow cover periods. During snow-melting periods, soil moisture and temperature did not served as limiting factors on the growth of S. caninervis. The soluble sugar content, and the activities of POD, CAT with shrub removal were significantly higher than shrubs left intact. This may indicate that the decline of the function of maintaining constant soil temperature due to shrub canopy increased the damage of temperature on moss plants. In addition, as for physiological and biochemical characteristics, there were no significant differences between two treatments of 50% shrub canopy and shrub canopy left intact. In snow covered periods and snow melting periods, the MDA content, the activities of POD, SOD and CAT of S. caninervis under shrub canopy removed completely were significantly higher than that of 50% shrub canopy and shrub canopy left intact, except for soluble protein content. The duration of chlorophyll fluorescence activity of S. caninervis growing in habitats with shrubs removed completely was significantly shorter than that of S. caninervis growing in habitats of 50% shrub canopy and shrub canopy left intact. This result indicated that the removal of shrubs may increase the UV-B radiation and weaken the “moisture island effects” developed by the existence of shrub canopy.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201607008

Key words: Gurbantünggüt desert, Syntrichia caninervis, biological soil crusts, snow cover

Ben-Feng YIN, Yuan-Ming ZHANG, An-Ru LOU. Impacts of the removal of vascular plants on physiological and biochemical characteristics of Syntrichia caninervis during winter season in a temperate desert[J]. Chin J Plant Ecol, 2016, 40(7): 723-734.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2015.0441

https://www.plant-ecology.com/EN/Y2016/V40/I7/723

Figures/Tables 6

Fig. 1 Variations of surface temperature and light intensity in different microhabitats during the experiment.

Fig. 2 Changes of water content in Syntrichia caninervis shoots in different treatments (mean ± SE). Different small letters indicate significant difference between different treatments (p < 0.05).

Fig. 3 Changes of maximum potential quantum efficiency of PSII (Fv/Fm) and actual photochemical efficiency (Y(II)) in Syntrichia caninervis shoots during the snow thawing periods in different treatments (mean ± SE).

Table 1 Repeated measures ANOVA on the effects of shrub and times on physiological and biochemical characteristics in Syntrichia caninervis

生理生化指标 Parameters	脯氨酸 Proline	可溶性糖 Soluble sugar	可溶性蛋白 Soluble proteins	MDA	SOD	POD	CAT
灌丛 Shrub	34.118^**	14.481^**	20.557^**	75.111^**	24.882^**	35.667^**	17.438^**
积雪期 Snow periods	8.333*	169.067^**	320.743^**	738.299^**	411.191^**	108.391^**	252.618^**
灌丛×积雪期 Shrub × snow periods	0.399	18.177^**	3.443^*	78.313^**	14.333^**	5.259^*	6.499^*

Fig. 4 Changes of the content of proline, soluble sugar and soluble protein in Syntrichia caninervis shoots in different treatments (mean ± SE). Different small letters indicate significant difference between different treatments (p < 0.05).

Fig. 5 Changes of the content of malonyldialdehyde (MDA), the activity of peroxidase (POD), superoxide dismutase (SOD) and Catalase (CAT) in Syntrichia caninervis shoots in different treatments (mean ± SE). Different small letters indicate significant difference between different treatments (p < 0.05).

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