尾叶桉人工林取代灌草植被对土壤物理性质的影响

Effects of Eucalyptus urophylla Plantation Replacing Shrub grass Vegetation on Soil Hydrology Physical Properties

对广西南宁市郊尾叶桉人工林及灌草坡 0～ 1 0 0cm深土壤物理性质对比测定的结果表明 :林地土壤容量为 1 37～ 1 47g/cm3,比灌草坡 1 5 0～ 1 6 2g/cm3分别低0 1 2～ 0 1 9g/cm3.平均总孔隙度、平均通气度、平均最大持水量和平均渗透速度依次为 45 0 % ,2 1 4% ,435 7mm和 1 3mm/min ,分别比灌草坡高 3 4% ,3 4% ,1 9 9mm和 0 2 8mm/min ,随土壤深度的增加 ,林地与灌草坡各参数的差值逐渐减小 .尾叶桉人工林取代灌草植被后 ,对改良土壤结构 。

In this paper,comparative studies were conducted on soil hydrology physical properties of Eucalyptus urophylla plantation and shrub grass vegetation(0～100cm)in Nanning suburbs of Guangxi.The result showed that the soil volume weight of Eucalyetus urophylla plantation was 1.37～1.47g/cm 3 ,0.12～0.19g/cm 3 lower than that of shrub grass vegetation(1.50～1.62g/cm 3 repecstively).Mean total porosity,mean aeration porosity,mean maximun moisture capacity and mean infiltration rate were 45.0%,21.4%,435.7mm and 1.3mm/min in proper order,thus 3.4%,3.4%,19.9 mm and 0.28mm/min higher than that of shrub grass vegetation respecstively.With the increase of soil depth,the significances of every parameters showed a decrease tendency of the Eucalyptus urophylla plantation and shurb grass vegetation.The result showed that the Eucalyptus urophylla plantation replacing shrub grass vegetation.had better effects in hydrological and eclogical functions,soil texture improvement,water storage and presser moisture of soil.