The stomatal density on the epidermis of leaf blades increased with leaf positions in Ji Za No. 6, but little differences in stomatal density were observed among leaf positions in y2203.
冀杂6号叶片表皮气孔密度随叶位升高而增加，而y2203的却差异不大。
参考来源 - 期刊学术社区Three principal components were obtained,in which the number and diameter of the large,medium and small papillae on the long cells,stomatal density contributed most variance.
主成分分析后得到3个在各个性状因子中贡献率最大的主成分,分别是中央长细胞大乳突、中乳突及小乳突的数目、大小,气孔密度。
参考来源 - 杂草稻和栽培稻叶片下表皮结构特征的观察及聚类分析·2,447,543篇论文数据，部分数据来源于NoteExpress
There was no significant difference in LL/LW, P/S, epidermal thickness and stomatal density along the elevation gradient.
叶长宽比、P/S的比值、表皮厚度与气孔器密度无明显差异。
Conversely, when atmospheric carbon dioxide is low, stomatal density tends to increase - it's like getting more mouths to breathe with.
相反，当大气二氧化碳浓度低时，气孔密度似乎增加了——就像长出更多的嘴来呼吸。
The number of chloroplast and chlorophyll content in the dodecaploid are more than hexaploid, stomatal density are lower than hexaploid.
同时，十二倍体较六倍体的叶绿体数目明显增多，叶绿素含量提高，但气孔密度减小。
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