常见例句Keywords Pupulus deltoides;Vascular cambium;initiation;development; 美洲黑杨;维管形成层;发生;发育;Excessive Depletive Dynamic of Soil Water of Pupulus simonii in Loess Hilly Region 黄土丘陵区小叶杨林地土壤水分过耗动态Pupulus bollean 新疆杨 返回 Pupulus