论文部分内容阅读
树木种子的发芽率与大于某一界限温度的积温及持续时间的长短有关。一般以日平均温度>5℃作为树木开始生长的温度指标,其持续时间为树木的生育期。树木种子萌芽出土的温度有人定为12℃,本文试从种子发芽率与日平均气温>10℃的有效积温及持续日数进行相关与回归分析,资料取自八一农学院林学系温室发芽试验。一、研究方法对黑松、樟子松、油松、雪岭云杉、兴安落叶松、鱼鳞松、红皮云杉的品质指标进
The germination rate of tree seeds is related to the accumulated temperature and duration which is greater than a certain limit temperature. General average daily temperature> 5 ℃ as the temperature of trees began to grow, the duration of the tree growth period. The temperature of germination of tree seeds was determined to be 12 ℃. The correlation and regression analysis of seed germination rate and effective accumulated temperature> 10 ℃ and the number of continuous days were carried out. The data were taken from the greenhouse germination test of the Forestry Department of Bayi Agricultural College. First, the research methods of black pine, Pinus sylvestris, Pinus tabulaeformis, snowy spruce, Larix gmelinii, scales, red spruce quality indicators into