美国南方阿巴拉契亚山脉90％以上的成龄香脂冷杉由于受到球蚜的侵袭,使得这种冷杉大批死亡。目前,仍有许多香脂冷杉处于危机之中。为了保护和恢复阿巴拉契亚山的香脂冷杉,美国的林业科学家们制定了一项研究计划。根据计划,来自北卡罗来纳州立大学、州林务局、农业部林务局和田纳西大学的林业科学工作者们,去年入冬前在阿巴拉契亚山脉的6个区域采集了 More than 90% of adult balsam fir in the Appalachian Mountains of the southern United States caused a large number of deaths of this kind of fir due to its invasion by aphids. At present, there are still many balsam fir in crisis. To protect and restore balsam fir in the Appalachians, forestry scientists in the United States developed a research project. According to the plan, forestry scientists from North Carolina State University, the State Forestry Administration, the Department of Agriculture’s Forest Service, and the University of Tennessee collected six regions of the Appalachian Mountains before winter,