酸雨和大气污染对杨树木材物理性质的影响——对年轮宽度和基本密度的影响

通过对受害材与健康材的年轮宽度和基本密度的对比研究 ,可以看出酸雨对杨树生长产生了显著的影响 .酸雨会造成杨树生长减缓 ,年轮宽度变窄 ,生物量和材积生长量下降 ,且酸雨的酸度越高 ,造成的危害越严重 .受害材的平均年轮宽度为 1 0 .42 mm,健康材的平均年轮宽度为 1 1 .83mm,受害材较健康材相对下降 1 2 .77%,方差分析表明受害材与健康材的年轮宽度有显著差异 .杨树的年轮宽度与树龄有极好的指数相关性 ,采用比值法求得年轮宽度指数 ,健康材的年轮宽度指数均接近 1 ,受害材的年轮宽度指数偏低 .与健康材相比 ,受害材的基本密度、气干密度和全干密度分别降低 4.0 1 %、3.97%和 3.60 %,表现轻度下降

Effects of Acid Rain and Air Pollution on Physical Property of Poplar Wood--Effects of them on Ring Widty and Basic Density

Tree ring width and basic density of trees (populus euramericana) selected from healthy and acid rain damaged forests were analysed to evaluate the possible impacts on tree growth and wood properties. Acid rain affected tree growth slower, tree ring width narrowerr and basic density lower. Tree ring width of diseased trees decreased 12.77% than that of healthy trees. Tree ring width of diseased trees and healthy trees showed significant difference. Compared with healthy trees, the basic density and air drying density and oven dry density of diseased trees decreased respectively 4.01%, 3.97% and 3.60%.