Artificially imposed 0%(CK) ,50%,70%,80% or 90% shading condition was applied on seedlings of rubber tree (Hevea brasiliensis) to evaluate the effect on growth of the plants in Hainan Province .The results showed that ,with 90% shading ,the height ,stem girth ,leaf whorl distance ,and leaf count of the seedlings were significantly higher than those of the plants grown under other treatments .As compared to CK ,the total area and chlorophyll content of leaves increased as well with the largely shaded condition ,but decreased at 50% or 70%level .In addition ,90% shading also rendered the significantly higher transplanting rate ,at 91.72% .It appeared that 90% shading blocked much of the natural sunlight and lowered the surrounding temperature to significantly promote the grow th and increase the leaf size and chlorophyll content of the tissue-cultured H .brasiliensis seedlings in Hainan Province .%通过人工遮荫方式研究5种遮荫强度(0%、 50%、 70%、 80% 和90%)对海南省橡胶树组培苗生长的影响.结果表明:90% 遮荫条件下橡胶树组培苗的株高、茎粗、叶蓬距和叶片数均显著高于其他4个处理,且明显提高橡胶树组培苗的叶面积和叶绿素相对含量; 90% 遮荫的橡胶树组培苗出圃率最高(91.72%) ,显著高于其他处理.研究表明90% 遮荫条件下能克服海南省夏天辐射过强、气温过高对橡胶树组培苗幼苗不良影响,有效提高植株生长、叶面积和叶绿素含量.
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