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杨树是我区的主要造林树种。我区属大陆性气候,雨量少、蒸发量大,大气干燥。杨树生长常因水分而受阻,研究自然条件下树木的水分状况难度较大,随着林业生产的发展,弄清本地区主要杨树的水分关系在理论和生产实践上都具有重要意义。我们于1983年～1984年对银川地区几种杨树的组织含水量,自由水与束缚水含量,蒸腾强度,水分亏缺和相对含水量进行了测定,为生产提供依据,现将结果总结如下:
Poplar is my main afforestation species. My area is a continental climate, less rainfall, evaporation, the atmosphere dry. Poplar growth is often hindered by the development of water. It is very difficult to study the water status of trees under natural conditions. With the development of forestry production, it is of great significance in the theory and practice to make clear the relationship between the water content of the main poplars in the region. We measured the tissue water content, free water and irreducible water content, transpiration intensity, water deficit and relative water content of several poplar species in Yinchuan from 1983 to 1984 to provide basis for production. The results are summarized as follows :