sexual cycle

Oestrus cycle arises after sexual maturation in female mammal. It is regulated by the internal factors such as endocrine and nervous system and affected by outer enviroment such as season.

雌性哺乳动物性成熟后出现发情周期，发情周期受内分泌和神经系统等内部因素调节，同时受季节的外环境影响。

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The parameters of the vegetative growth, the clonal reproduction and the sexual reproduction of the natural, fertilizable, drought stress and pruning stress conditions were analyzed by the principal component analysis ( PCA), and the life cycle forms are determine by score proportion of PCA.

将正常生长与施肥、干旱和剪枝后的长春花营养生长、有性生殖、克隆生殖形态学参数进行主成分分析，根据主成分得分比例划分生活史型。

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