遮荫对几种苗木生长的影响

以黄金榕、彩霞变叶木、香港鹅掌藤的苗木为材料, 探讨不同遮荫强度对3 种容器育苗木生长、水分利用及苗木生长微环境如土壤温度的影响, 结果表明: 一层遮荫网处理的苗木比无遮荫网和二层遮荫网处理的苗木在株高、冠幅、干径以及叶片数目等方面均增长较快; 苗木的地下部分、叶和茎含水量均较低. 无遮荫处理利用较多水分, 无遮荫处理的土壤温度在14 : 00 明显高于所有遮荫处理.

Effect of Different Shading Treatments on the Growth of Several Nursery Trees

The three confainer-grown trees of Ficus microcarpa 'Colden Leaves', Godiaeum Variegatum 'Indian Blanket'and Scheffera arboricola'Hong Kong'were used for studying the effects of different shading treatments on growth,water utilization and microenvironment such as soil temperature. Results showed all nursery trees of one layer of gauze had higher growth than that of nonshading and two layer of gauze in height , width, caliper and number of leaves, and the water content was lower in parts of under the soil, leaves and stems. Nonshading trees tended to use more water and made somewhat higher soil temperature on 14:00.