The rooting rates of P, davidiana in phytotron reached 85%.
在人工气候室条件下，山杨扦插生根率达85％。
2
There were no detailed studies on litter and forest floor of Populus davidiana and Fraxinus mandshurica in this region.
针对帽儿山林区的水曲柳、山杨两种主要林分类型凋落物以及林下凋落物层进行细致的研究较少。
3
In this paper, the biomass of 20-year-old Keteleeria davidiana var. Chien-peii colony in Qingyan Town of Guizhou province has been investigated and analyzed.