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Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (5): 163-173.DOI: 10.7522/j.issn.1000-694X.2019.00051

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Effects of Precipitation on Growth and Physiology of Three Psammophytes in the Horqin Sandy Land, China

Chen Juanli1,2, Zhao Xueyong1, Liu Xinping1, Zhang Yaqiu3, Luo Yongqing1, Zhang Rui1,2, Zhang Runxia1,2, Yu Hailun1,2   

  1. 1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Hanzhong Agricultural Technology Extension Center, Hanzhong 723000, Shaanxi, China
  • Received:2019-01-27 Revised:2019-07-08 Online:2019-09-29 Published:2019-09-29

Abstract: The response of plant to the change of precipitation pattern is one of the important contents of the study on the mechanism of plant adapting to environmental changes, while the comparative study on the response of plant to the change of precipitation gradient in arid and semi-arid regions is rarely reported. Effects of precipitation on growth and physiology of three psammophytes were conducted with a precipitation-addition-reduction device in Horqin Sandy Land. The results showed that (1) The average density reached the maximum in June, but the average coverage reached the maximum value in July, and the coverage reached the highest of 58.0% under +60% treatment. (2) The main vegetation in precipitation addition region were Bassia dasyphylla and Salsola collina, while the main vegetation in precipitation reduction region was Tribulus terrestris. Under -60% treatment, the density of T. terrestris in the period from June to August was 70%, 80% and 79%, which was significantly higher than other plants. (3) The relative water content (RWC) of the studied species decreased and the membrane permeability increased as precipitation decreased. RWC of T. terrestris was higher than those of B. dasyphylla and S. collina, but the malondialdehyde (MDA) was opposite, which indicated that the ability of T. terrestris to withstand dehydration and damage was stronger than those of B. dasyphylla and S. collina. (4) Fv/Fm and ΦPSⅡof three psammophytes gradually increased with the increase of precipitation, but decreased with the increase of drought days.>

Key words: psammophytes, precipitation addition or reduction, growth properties, chlorophyll fluorescence, antioxidant enzymes

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