中文翻译与英英解释 | n.
【植物；植物学】周皮。
-al, -ic adj.
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例句与用法 | 1. | In damaged stems and roots , and in those undergoing secondary growth , it is replaced by a secondary layer , the periderm
已损伤的茎和根，以及进行次生生长的根茎中，表皮被次生层即周皮代替。
| | 2. | The results showed that the root transactions had significant differences in periderm , phloem , and xylem between cultivated and wild salvia miltiorrhiza
结果表明，在解剖横切面上，栽培与野生丹参根的周皮、韧皮部、木质部具有显著差异。
| | 3. | In cultivated salvia miltiorrhiza roots , light - colored periderm contained less layers of cells and low ratio of phloem to xylem , compared with those in wild salvia rniltiorrhiza roots
栽培丹参根的周皮细胞层数少、色淡，韧皮部与木质部比值小，而野生丹参根的周皮细胞层数多、颜色重，韧皮部与木质部比值大。
| | 4. | Thickness of upper and lower epidermis of leaves , width of xylem and phloem of annual and biennial branches , ratio of late wood to early wood , periderm thickness of biennial branches , and length of xylem ray present decreasing trends with latitude ascending ; while ratio of palisade tissue to spongy tissue , epidermis thickness of annual branches , and cortex thickness of biennial branches show unobvious variations with latitude increasing
叶的上下表皮厚度、 1和2年生枝木质部及韧皮部宽度、晚材早材比值、 2年生枝的周皮厚度、木射线长等均随纬度升高而呈下降趋势；而叶的栅栏组织和海绵组织比值、 1年生枝表皮厚度、 2年生皮层厚度等解剖结构随纬度变化没有明显规律。
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