不同坡位桉树人工林生长和土壤理化性质比较

摘要

[Objective] In order to understand the difference of growth and soil fertility of Eucalyptus spp plantations in different site conditions.[Method] Using 2 years old Eucalyptus spp plantations,the growth and soil physical and chemical properties in different slope position were compared.[Result] Eucalyptus spp plantations soil were generally acidic,surface concentrations were higher than deep,with the decrease of slope,trees growth and soil physical and chemical properties had been improved gradually,showing a positive trend,the surface soil fertility was better than deep soil in the same slope position.On the whole,the planting site soil fertility was at a low level,N and P were shortage seriously.[Conclusion] At the time of building Eucalyptus spp plantations in the future,we should choose the middle and lower place of the slope,for the upper part of the slope soil nutrient is lacking,should be increased fertilization after planting,and appropriate micronutrient properly to ensure normal growth of trees.%[目的]了解不同立地条件下按树人工林木生长和林地土壤肥力的差异.[方法]以2年生桉树人工林为研究对象,对不同坡位桉树林木生长和土壤物理性质、化学性质进行了分析比较.[结果]桉树人工林林下土壤普遍呈酸性,表层土壤酸性强于深层土壤;随着坡位的降低,林木生长状况和土壤理化性质逐渐好转,呈正相关趋势,同一坡位表层土壤肥力状况优于深层土壤.整体来看,造林地土壤肥力处于偏低水平,氮、磷缺乏严重.[结论]今后在营建按树人工林时,优先选择山坡中、下部立地条件较好的造林地造林,对于山坡上部土壤养分较缺乏的地块,造林后应加大施肥量,适当补充微量元素,以保证林木的正常生长发育.