Changes of four common plant populations growth and their anti-oxidative enzymatic system in desertification process

Abstract

Abstract: This paper studied the changes of the growth and anti-oxidative enzymatic system of four common plant populations during the desertification process of sandy grassland.The results showed that in the process of desertification,the individual height and density and the density percentage of the populations all had a decreasing trend.The growth of Melilotoides ruthenica was more vigorous before moderate desertification (MD) stage,but restricted after that.In MD stage,the growth of Leymus chinensis was heavily restricted,and its individual height,density and density percentage accounted for 57.19%,2.50% and 6.22% of those in original vegetation (OV) stage,respectively.The individual height and density of Cleistogenes squarrosa and Artemisia frigida increased in the stages of potential desertification (PD),light desertification (LD) or MD because of their phase status of dominant species and their stronger stress resistance.The SOD and POD activities of the common plant populations increased in PD and MD stages,but decreased in LD and heavy desertification (HD) stages.The CAT activity of Leymus chinensis was higher,whose response to desertification was not significant (P>0.05),and that of Melilotoides ruthenica increased significantly in PD and HD stages (P≤0.01).The activities of the three anti-oxidative enzymes in the common plant populations,except the CAT activity of Melilotoides ruthenica,decreased in HD stage.The MDA content in the common populations increased firstly,then decreased,and finally increased from OV to MD stage,and had a significant difference in different desertification gradients (P≤0.05).Based on the integrated analysis of the ecological and physiological changes,it could be concluded that Leymus chinensis was more sensitive to desertification,while Melilotoides ruthenica had a stronger bioenergy.

Key words: Desertification, Sandy grassland, Common plant population, Anti-oxidative enzymes

CLC Number:

Q948.11

ZHU Zhimei, YANG Chi . Changes of four common plant populations growth and their anti-oxidative enzymatic system in desertification process[J]. Chinese Journal of Applied Ecology, 2004, (12): 2261-2266.

References

[1] Bowler C, van Montagu M, Inze D. 1992. Superoxide dimutase and stress tolerance. Ann Rev Plant Physiol Plant Mol Biol, 43: 83～118
[2] Chen X(陈雄), Wang Z-L(王宗灵), Ren H-X(任红旭), et al.1999. Effects of altitude on antioxidative system in leaves and roots of Plantago major. Acta Bot Sin (植物学报), 41 (8): 846～850(in Chinese)
[3] Cheng X(程序). 1999. Frintier issue of modem ecology in the study of ecotone between agriculture and animal husbandry. Resour Sci(资源科学), 21(5) :2～8(in Chinese)
[4] Chowdhury SH, Choudhur MA. 1985. Hydrogen peroxide metabolism as an index of water stress tolerance in jute. Plant Physiol, 65: 503～507
[5] Dhindsa RS, Matowe W. 1981. Drought tolerance in two mosses:Correlated with enzymatic defense against lipid peroxidation. J Exp Bot, 32: 79～91
[6] Foyer CH, Harbinson J. 1994. Oxygen metabolism and the regulation of photosynthetic electron transport. In: Foyer CH, Mullineaux PM, eds. Causes of Photooxidative Stress and Amelioration of Defense Systems in Plants. Boca Raton:CRC Press. 1～42
[7] Irigoyen J J, Emerich DW, Sanchez-Diaz M. 1992. Alfalfa leaf senescence induced by drought stress:Photosynthesis, hydrogen peroxide metabolism, lipid peroxidation and ethylene evolution. Plant Physiol, 84: 67～72
[8] Jiang M-Y(蒋明义),Jing J-H(荆家海),Wang S-T(王韶唐).1991.Effect of water stress on photosynthesis cobring mater and peroxidation of membrane lipidin rice.J Northwest Agric Univ(西北农业大学学报),19(2):79～84(in Chinese)
[9] Jones MM.1978.Osmotic adjustment in leaves of sorghum in response to water deficits.Plant Physiol,61:122～126
[10] Li H-S(李合生)ed.2000.Principle and Technique of Plant Physiological Biochemical Experiment.Beeijing:Highter Educational Press.(in Chinese)
[11] Liu Y-R(刘颖茹),Yang C(杨持),Zhu Z-M(朱志梅),et al.2004.Soil C and N dynamics during desertification of grassland in Northern China.Chin J Appl Ecol(应用生态学报),15(9):1604～1606(in Chinese)
[12] Lu P(鲁萍),Guo J-X(郭继勋),Zhu L(朱丽).2002.Soil catalase activity of main plant communities in Leymus chinensis grasslandin northeast China.Chin J Appl Ecol(应用生态学报),13(6):675～679(in Chinese)
[13] Zeng Z-H(曾昭惠),Zhang Z-Y(张宗玉).1995.The oxidative damage of mitochondrial DNA by free radicals and aging.Progr Biochem Biophys(生物化学与生物物理进展).22(5):429～432(in Chinese)
[14] Zhao H-L(赵哈林),Zhang T-H(张铜会),Zhao X-Y(赵学勇).2002.Sand desertification processes of over-grazing pasture in Inner Mongolia.Arid Zone Res(干旱区研究),19(4):1～6(in Chinese)
[15] Zhao H-L(赵哈林),Zhao X-Y(赵学勇),Zhang T-H(张铜会),et al.2003.Study on damaged process of the vetation under grazing stressin sandy grassland.ActaEcol Sin(生态学报),23(8):1505～1511(in Chinese)
[16] Zhou R-L(周瑞莲),Wang H-O(王海鸥),Zhao H-L(赵哈林).1999.Physiological changes and high-temperature resistence of Artemisia halodendron and A.frigida.J Desert Res(中国沙漠),19(supp.):59～64(in Chinese)
[17] Zhu J-F(朱俊凤),Zhu Z-D(朱震达).2002.Prevention and Treatment of Desertification in China.Beijing:China Forest Industry Press.72～79(in Chinese)
[18] Zou C-J(邹春静),Han S-J(韩士杰),Xu W-D(徐文铎).et al.2003.Eco-physiological responses of Picea mongolica ecotypes to drought stress.Chin J Appl Ecol(应用生态学报),14(9):1446～1450(in Chinese)