【摘要】 以贵州省铜仁地区63块杨树固定标准地为研究对象,调查了I 69杨(Populus deltoidsBartr.cv.‘Lux’)在不同立地条件下的生长状况。结果表明:随着坡度的增大,I 69杨的胸径、树高和蓄积均减小,从阳坡、半阳坡、半阴坡到阴坡,其胸径、树高和蓄积依次减小,且在阳坡、阴坡间差异显著;I 69杨上坡和下坡地生长状况差异也显著,下坡的生长状况好于上坡。与生长最差的荒地相比,退耕地上的杨树生长最好。随着土层厚度的增加,I 69杨胸径、树高、蓄积均增大,随着土壤密度的增大,杨树胸径、树高和蓄积均减小。更多还原

【Abstract】 Based on the data investigation from sixty-three sample plots in Tongren district of Guizhou province,the effects of site conditions on the growth of poplar plantation clone(I69) were analyzed.The main results are as follows:The poplar growth varies in different gradients,directions of slope and slope locations.With increase of gradients,DBH,tree height and stand volume decrease gradually.From sunny slope to shady one,it also does,there is a significant difference between sunny slope and shady one,but on the bottom of slope,DBH,tree height and stand volume are higher than those on top of slope.Compared to waste land,the increasement of DBH,tree height and stand volume in the cropland for green was the highest.With increase of soil depth,DBH,tree height and stand volume were all improved.But with increase of soil bulk density,DBH,tree height and stand volume were reduced.更多还原