本文对十个杨树种类(其中有无性系、变种，和种)一年生插条苗的叶、茎和根的生长及相互关系进行了研究。

This paper deals with leaf, stem and root growth of ten kinds (including clones, varieties and species) of one year poplar seedlings grown from cuttings.

youdao

本文对十个杨树种类(其中有无性系、变种，和种)一年生插条苗的叶、茎和根的生长及相互关系进行了研究。

This paper deals with leaf, stem and root growth of ten kinds (including clones, varieties and species) of one year poplar seedlings grown from cuttings.

youdao