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Scientia Silvae Sinicae ›› 2016, Vol. 52 ›› Issue (1): 48-54.doi: 10.11707/j.1001-7488.20160106

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Influences of Different Light Intensities and Soil Water Drainage on Branch Increment and Some Physiological Indexes in Leaves of Rhododendron moulmainense

Bai Yuqing1, Xie Lijuan2, Wang Dingyue3, Sun Yanjun3   

  1. 1. Lawn Research Institute of Beijing Forestry University Beijing 100083;
    2. School of Applied Chemistry and Biotechnology, Shenzhen Polytechnic Shenzhen 518055;
    3. Shenzhen City Park Management Center Shenzhen 518035
  • Received:2015-09-13 Revised:2015-10-19 Online:2016-01-25 Published:2016-02-26

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Abstract: [Objective] The growth of Rhododendron moulmainense is closely related with light intensity and soil drainage, therefore, selection of appropriate light intensity and soil drainage conditions is of great significance for introduction and cultivation of R. moulmainense. [Method] Different shadings (0%,30%,50%,80%) and different soil drainage measures (High ridge and Flat ridge) were applied in the article. The branch increments and some physiological indexes in leaves of R. moulmainense were measured, and the correlations between branch increment and the physiological indexes were analyzed. [Result] The results showed that under 50% shading and high ridge treatments, the branch increment, and chlorophyll content and RWC in leaves of R. moulmainense were highest. The relative conductivity, contents of MDA, soluble sugar and soluble protein, and SOD activities in the leaves were lower or the lowest. Under 0% shading and flat ridge treatments, the branch increment, and chlorophyll content and RWC in leaves of R. moulmainense were lowest, whereas the relative conductivity, contents of MDA, soluble sugar and soluble protein, and SOD activities were highest. In general, with increasing shading and soil drainage, the branch increment, and chlorophyll content and RWC in leaves had a trend of gradual increase, while the other measured indexes all appeared a trend of gradual decrease. Correlation analysis showed that there was an extremely significant negative correlation between the branch increment with SOD activity, relative conductivity and MDA content, indicating that the branch increment of R. moulmainense was closely related to the changes of these three indexes in stress environment. Thus, the adaptation degree of R. moulmainense to habitat can be determined by means of above three indexes. [Conclution] According to these experiment results, it is speculated that R. moulmainense would be suitable for growing in the habitat with 50% shading and good drainage soil.

Key words: Rhododendron moulmainense, shading, soil water drainage, branch increment, physiological index, correlation analysis

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