论文部分内容阅读
对于按树的抗寒性,历时13年的比较观测,经过四次低温考验,选择出抗寒性较强的两个校树种和三个单株。
For the tree according to the cold resistance, which lasted 13 years of comparative observation, after four low temperature test, choose a cold hardy two school tree species and three single plant.