杨树是温带速生树种。在自然界中,杨树首先是在大河谷地洪水冲积土壤上生长起来的。是原生演替序列中湿地生境的先锋树种之一。经长期的自然选择和对环境的适应,杨树派间、种间及种内无性系间对水份的适应性必然存在很大的差别。研究和利用这种差异无疑对低湿地杨树造林良种的选育和扩大杨树的栽培区域都具有重要的意义。我国长江中下游滨湖水网地区,属亚热带季风湿润气候,雨量充沛,土壤肥沃,热量丰 Poplar is a temperate fast growing tree species. In nature, poplar was first grown on flood alluvial soil in the Great Valley. It is one of the pioneer tree species of wetland habitat in the succession of primary succession. After long-term natural selection and adaptation to the environment, poplar trees, interspecific and intraspecific clones have inevitably great differences in adaptability to water. The research and utilization of this difference will undoubtedly have important significance for the breeding of lowland wetland poplar seedlings and the poplar cultivation area. The middle and lower reaches of the Yangtze River in China’s rivers and lakes water network area, is a subtropical monsoon humid climate, abundant rainfall, fertile soil, heat abundance