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以引进的4个杨树品种为材料,在内蒙古大兴安岭林区3个试验点进行2 a根1 a干苗不同密度的试验,并对4个杨树品种进行成活率调查和苗期试验测定,结果表明,苗期当年不同品种、试验点、密度的成活率差别很大,而3个试验点的不同品种和不同密度对胸径和苗高的生长影响不同,可以初步确定出适宜不同试验点的杨树品种。利用Logistic方程对各个品种扦插密度为40 cm×50 cm的2 a根1 a干生扦插苗木的苗高、地径的年生长节律进行拟合,方程拟合效果显著,相关系数0.988以上。并以此将无性系扦插苗的生长过程分为成活期、生长前期、速生期和生长后期4个时期,年生长速度表现出明显的“慢-快-慢”的节律,其中在绰尔、阿里河、大杨树试验地速生期内的苗高生长量占年生长量的比率平均为64.2%、68.7%、67.6%,地径生长量占年生长量的比率平均为59.0%、62.2%、58.9%。并对各个生长时期的生长特点进行了分析,探讨了苗木的年生长规律。通过对苗木年生长节律和影响苗木生长的主要环境因子进行分析,可以得出在绰尔地区可引种的速生杨树种为黑林2号,其次为白城小黑杨;在阿里河地区可引种的速生杨树种为白城小黑杨,其次为黑林2号;在大杨树地区可引种的速生杨树种为白城小黑杨、其次为银中杨和甜杨。
Four poplar cultivars were used as materials to test the density of 2-year-old 1-year-old dry seedlings at 3 experimental sites in the Greater Xing’an Mountains, Inner Mongolia. The survival rate of 4 poplar cultivars was investigated and the seedling stage was tested. The results showed that the survival rates of different varieties, test points and densities varied greatly in the seedling stage. Different breeds and densities of the three test sites had different effects on the growth of DBH and seedling height, and the suitable test points Poplar varieties. Logistic equation was used to fit the annual growth rhythm of seedlings’ height and diameter of 1-year-old dried seedlings of 2-year-old rootstocks with a density of 40 cm × 50 cm. The fitting effect was significant with a correlation coefficient of 0.988. The clonal growth of clonal plantlets was divided into four stages: survival stage, early growth stage, fast growth stage and late growth stage. The annual growth rate showed obvious “slow - fast - slow” rhythms. Among them, The average annual growth rate of seedlings height in Ali River and Populus euphratica forest was 64.2%, 68.7% and 67.6% respectively, and the average ratio of diameter growth to annual growth was 59.0% and 62.2% , 58.9%. The growth characteristics of each growth period were analyzed, and the annual growth pattern of seedlings was discussed. Through the annual growth rhythm of seedlings and the main environmental factors that affect the growth of seedlings, it can be concluded that the quick-growing poplar species introduced in Chuo area is Heilin 2, followed by Populus simonii; Of Poplar Populus as black poplar in Baicheng, followed by Black Forest 2; poplar poplar species introduced in Dayangshu area are Populus simonii, followed by Poplar and poplar.