UPGMA is taken to calculate the genetic distance within and between populations. Systematictree is constructed.
应用UPGMA法计算了种群内和种群间的遗传距离，并构建了系统树。
2
Afforestation countermeasures for mountain waste in Saihanba Tree Farm is discussed using systematic engineering.
运用系统工程分析的观点对塞罕坝林场今后的荒山造林对策进行了探讨。
3
Tree of decision is a kind of analyzing tool used to solve the problems of risk's decision. In detail, it is a systematic method using tree derivation to analyze and select action scheme.