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我国西北地区,自然条件严酷,生态环境恶化,林业建设任务重、问题多。特别是发展速生丰产林难度较大。杨树是西北地区的主要速生树种。因此,研究解决干旱半干旱条件下的杨树速生丰产栽培技术,具有十分重要的意义。甘肃位于我国黄土、蒙新、青藏三大高原的交汇处,其自然地理环境在西北地区具有一定的代表性。现根据我们近年来的调查研究和试验观察,就甘肃干旱半干旱地区(以及相邻
In the northwestern region of our country, the natural conditions are harsh, the ecological environment is deteriorating, and the task of forestry construction is heavy with many problems. In particular, it is more difficult to develop fast-growing and high-yielding forests. Poplar is the dominant species in northwestern China. Therefore, it is very important to study and solve the fast-growing and high-yield cultivation techniques of poplar under the conditions of arid and semi-arid conditions. Gansu is located at the confluence of the three major loess plates in China, including Loess Plateau, Mongolia Plateau and Qinghai Plateau. Its natural geographical environment is representative in the northwestern region. According to our recent research and experimental observations, arid and semi-arid areas in Gansu (and adjacent