The ground base was evaluated and analysed by using biological index and variation of population of benthon which are effected by bottom water and mud environment.
以底栖动物作为底层水环境和底泥环境长期影响的指标，利用生物指数和种群结构的变化对底质进行评价和分析。
The paper also reviews polyphenolic types , property, distribution, physiological function, biological synthesis and genetic variation in tobacco.
本文还综述了烟草多酚的种类、特性、分布、生理功能、生物合成和遗传变异等内容。
The paper reports the study on the variation way of the relationship between mechano-physical properties as well as biological characteristics and planting periods of ramie.
本文以动态观点研究各季苧麻纤维的机械物理性能及生物学特性与生长期关系的变化规律。
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