Effects of Different Slope Positions on Soil Moisture and Physiological Indicators of Artemisia ordosica Root Zone in the Mu Us Sandy Land

doi:10.13560/j.cnki.biotech.bull.1985.2019-0462

Abstract

Abstract: This work aims to explore the variations in physiological indexes and soil moisture of Artemisia ordosica shrubs on different slopes for providing a theoretical basis and references in revealing the physiological and biochemical mechanisms of drought resistance of sandy plants,in the protection and restoration of sandy plants and in the response of desert plant communities under future environmental changes. Soil water content（SWC_0-300）,cell membrane permeability,malondialdehyde（MDA）and antioxidant enzymes of Artemisia ordosica on different slopes（bottom,middle and top of slopes）of total 0-300 cm soil layer in the Mu Us Sandy Land in Yanchi,Ningxia in 2018 were measured. The results showed that soil water content decreased with the increase of slope position and soil moisture content in 0-300 cm soil layer presented as middle slope > bottom slope > upper slope. With the increase of slope position,the cell membrane permeability of A. ordosica first decreased and then increased,and the superoxide dismutase（SOD）first increased and then decreased. MDA first increased and then decreased in July and August,but decreased with the increase of slope position in September and October. Peroxidase（POD）decreased with the increase of slope position in July and August,but first decreased and then increased in September and October. It is concluded that the correlation between cell membrane permeability and drought resistance of slope is the closest. A. ordosica has the greatest moisture content in the slope soil and thus strong drought resistance.

Key words: Artemisia ordosica, slope position, antioxidant system enzymes, soil moisture

MENG Wen-ting, WANG Tian-tian, ZHAO Xue-lin, ZHU Lin. Effects of Different Slope Positions on Soil Moisture and Physiological Indicators of Artemisia ordosica Root Zone in the Mu Us Sandy Land[J]. Biotechnology Bulletin, 2019, 35(12): 57-63.

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