杨树生长对土壤水分条件的反应非常敏感,虽然不同品种或无性系之间存在着明显的差异,但从总体来看,木材年轮宽度的变化主要是由土壤水分供应条件所决定的。在有条件灌溉的地区,人们除了关心灌溉的花费与木材增长量之间的经济效益外,同时也关心灌溉量与树木材质之间的相互关系。换句话说,木材质量会不会因灌溉量过多而下降?下降多少?这显然是科技工作者应当回答的重要问题。遗憾的是,在国内外繁多的文献中,报道灌溉对树木生长影响的结论很多,但是,关于灌溉对材性影响的研究工作,国外也为数很少,国内更未见有报道。 Poplar growth is very sensitive to soil moisture conditions. Although there are obvious differences among different cultivars or clones, the change of annual ring width is mainly determined by soil moisture supply conditions. In areas where irrigation is conditional, people are not only concerned about the economic benefits of irrigation and timber growth, but also the relationship between irrigation and the quality of trees. In other words, will the quality of wood decline due to excessive irrigation? What is the decline? This is obviously an important issue that scientists and technologists should answer. Unfortunately, there are many reports on the effect of irrigation on the growth of trees in many literatures at home and abroad. However, few studies have been done on the effect of irrigation on the properties of wood, and few have been reported in China.