Abstract: Two-year-old seedlings of Camellia semiserrata and C. crapnelliana were used as experimental materials and treated with full light (CK), 30% shading, 50% shading and 70% shading, in order to observe the effects of shading on the growth, biomass allocation and some physiological and biochemical indexes of the seedlings. The results showed that 30% shading could significantly increase the height net growth and total biomass of C. semiserrata seedlings, the contents of chlorophyll a and chlorophyll b were significantly increased, but SOD, CAT activities and Pro content were not significantly different from those of CK group, but MDA content was significantly decreased. Under 30% shading, the plant height and ground diameter of C. crapnelliana seedlings were significantly increased, while the contents of chlorophyll a, chlorophyll b, Pro and SOD enzyme activity were not different from those of the full light group, but the content of MDA was significantly decreased. The results showed that the optimal growth condition of the two Camellia seedlings under the experimental treatment was 30% shading. In addition, under 50% shading condition, although the ground diameter growth of C. crapnelliana seedlings was inhibited, its high growth was not significantly different from that of CK group, and the contents of chlorophyll a and chlorophyll b, and activity of CAT were significantly increased, while the contents of Pro and MDA were significantly decreased. The results indicated that the C. crapnelliana seedlings could adapt to the low light environment with 50% shading by adjusting chlorophyll content, CAT activity and Pro content. Therefore, C. semiserrata seedlings have a more stringent demand for light, which is controlled at 30% shading, while C. crapnelliana seedlings can adapt to a more shaded environment (50% shading) in production and greening applications.

Key words: Camellia semiserrata, Camellia crapnelliana, shading, growth, biomass, physiological characteristics

摘要： 以2年生南山茶Camellia semiserrata、红皮糙果茶C. crapnelliana实生苗为试材，研究全光照(CK)、30%遮阴、50%遮阴和70%遮阴等处理对其生长、生物量分配及部分生理生化指标的影响。结果表明，30%遮阴可显著增加南山茶幼苗株高净生长量、总生物量，其叶绿素a、叶绿素b显著增加，SOD、CAT酶活性及Pro含量均与CK组无显著差异，MDA含量则显著降低；红皮糙果茶幼苗则在30%遮阴下显著增加株高和地径，叶绿素a、叶绿素b含量及SOD酶活性、Pro含量与CK组无差异，MDA含量显著下降。说明两种山茶属植物幼苗较适宜的光照条件为遮阴30%。此外，红皮糙果茶幼苗在50%遮阴条件下与CK组比较，虽然地径生长受抑制，但株高生长无显著差异，且叶绿素a、叶绿素b含量与CAT活性显著增加，Pro、MDA含量显著下降，表明红皮糙果茶幼苗能通过调节叶绿素含量、CAT酶活性和Pro含量积极应对50%遮阴的弱光环境，进行适应性生长。因此生产上及绿化应用中，南山茶幼苗对光照的需求更为严格，遮阴控制在30%；红皮糙果茶幼苗则可适应更加荫蔽的环境(50%遮阴)。

关键词: 南山茶, 红皮糙果茶, 遮阴, 生长, 生物量, 生理特性