[目的]毛棉杜鹃生长与光照和土壤排水条件密切相关,筛选出适宜的光照和排水条件,对于毛棉杜鹃的引种栽培具有重要意义.[方法]设置不同遮荫水平( 0%,30%,50%,80%)和土壤排水条件(髙垄、平地),测定毛棉杜鹃枝条生长量和叶片部分生理指标,并对枝条生长量和叶片各生理指标进行相关分析.[结果]在遮荫水平50%高垄处理下,毛棉杜鹃枝条生长量最大,叶片相对含水量、叶绿素含量较高,相对电导率、MDA含量、SOD活性、可溶性糖含量、可溶性蛋白含量最低或较低; 全光照平地栽植时,毛棉杜鹃枝条生长量最小,叶片相对含水量、叶绿素含量最低,相对电导率、MDA含量、SOD 活性、可溶性糖含量、可溶性蛋白含量最高.总体上,随着遮荫水平的提高和土壤排水条件的增加,枝条生长量和叶片相对含水量、叶绿素含量呈逐渐增加的趋势,其他各项生理指标呈逐渐减少的趋势.相关性分析结果表明,毛棉杜鹃枝条生长总体积量与叶片丙二醛含量、相对电导率、SOD活性呈极显著负相关,说明在胁迫条件下叶片这3 项指标的变化与毛棉杜鹃枝条生长紧密相关,可通过这些指标判定毛棉杜鹃对其生境的适应程度.[结论]毛棉杜鹃适宜在遮荫 50%、土壤排水条件好的生境中生长.%[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.
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