Soil Depth Affects the Growth of Lettuce and Chicory in Extensive Green Roofs
Soil Depth Affects the Growth of Lettuce and Chicory in Extensive Green Roofs
复制标题
土壤深度影响大面积绿色屋顶中生菜和菊苣的生长
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Y. Cho
中科院分区：
文献类型：
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作者：
Y. Cho
摘要本研究旨在探讨绿色屋顶环境下，不同土壤深度对莴苣与菊苣生长之影响。将5、10和20 μ m的三种土壤深度施加于植物。莴苣和菊苣的幼苗被移植到绿色屋顶系统。土壤含水量在20 cm处最高，5 cm处最低。生菜地上部鲜重和干重均以10 cm深最高，20 cm深最低。菊苣地上部鲜重和干重以埋深5 cm最高，埋深20 cm最低。生菜和菊苣的干物质（DM）在20 cm深时最高，在5 cm深时最低。生菜的相对生长速率（RGR）以10 cm深最高，20 cm深最低。菊苣的相对生长速率在种植深度为5 cm时最高，在种植深度为20 cm时最低。生菜的光合作用、气孔导度和蒸腾速率在3种土壤深度之间没有显著差异，但在5 cm深度种植时最高。在叶菜类蔬菜中，全氮、磷、钾含量在3个土层间差异不显著。生菜叶片中T-N、Ca和Mg含量以种植深度为5 cm时最高。菊苣叶片中T-N和Ca的含量在种植深度为10 cm时最高，Mg的含量在种植深度为5 cm时最高。根据研究结果，建议生菜和菊苣的种植深度必须超过5厘米，以达到安全负荷，但在广泛的绿色屋顶中，10厘米的深度是最好的，以减少用水量。
The objective of this study was to examine the effect of soil depth on the growth of lettuce and chicory in a green roof environment. Three soil depths of 5, 10, and 20 ㎝ were applied to the plants. Seedlings of lettuce and chicory were transplanted to the green roof systems. Soil water content was the highest at 20 ㎝ deep and the lowest at a depth of 5 ㎝. Shoot fresh and dry weight of lettuce was the highest when planted at a depth of 10 ㎝ and the lowest at a depth of 20 ㎝. Shoot fresh and dry weight of chicory was the highest when planted at a depth of 5 ㎝ and the lowest at a depth of 20 ㎝. Dry matter (DM) of lettuce and chicory were the highest when planted at a depth of 20 ㎝ and the lowest at a depth of 5 ㎝. Relative growth rate (RGR) of lettuce was the highest when planted at a depth of 10 ㎝ and the lowest at a depth of 20 ㎝. RGR of chicory was the highest when planted at a depth of 5 ㎝ and the lowest at a depth of 20 ㎝. Photosynthesis, stomatal conductance, and transpiration rate of lettuce were not significantly different among the three soil depths, but these were the highest when planted at a depth of 5 ㎝. In these leafy vegetables, the contents of T-N, P and K were not significantly different among the three soil depths. In lettuce leaves, the contents of T-N, Ca and Mg were the highest when planted at a depth of 5 ㎝. In chicory leaves, the contents of T-N and Ca were the highest when planted at a depth of 10 while the content of Mg was the highest at a depth of 5 ㎝. Based on the findings, it is recommended that the depth of planting lettuce and chicory must be over 5 ㎝ for safe load, but a depth of 10 ㎝ is best to reduce water consumption in extensive green roofs.