【摘要】 <正> 一、试验地自然状况 1.地理位置 试验地在黑龙江省通河县凤山镇和平苗圃,座标是北纬46°16′,东经128°33′属于小兴安岭山系平顶山的南坡。试验面积1900m~2,处于南北向的开阔的山沟里,沟北侧中央有一个孤立的圆形“万宝山”南侧通向松花江到通河县江边40公里。试验地海拔更多还原

【Abstract】 The temperature amplitute of freezing injury to the seedlings of Pinus koraiensis, Larix gmelinii Picea koraiensis, Pinus sylvestis var, mongolica, Franinus mandshurica and Tilia amurensis have been measured. Based on the research for three years, the morphological character of the seedlings injured by frost has also been found. And in this paper, the methods of forecasting freezing and planting stage have been summed UP.更多还原