速生杨引种苗期对比试验及生长模型的建立

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。

Contrastive Tests on Seedling Stage and the Establishment of Growth Models of Introduced Fast-growing Poplar Breeds

By using four poplar breeds as experimental material,different densities of 2 a root with 1 a stock seedlings were carried out in three experimental areas,which situated on the Daxing' Anling woodlands of Inner Mongolia.The results show that the differences between the survival ratios and growth increments are obvious in the three experimental areas.The Logistic equation is applied to model growth increments of four poplar breeds'nursery stage.The results show that the correlations of modeling are significant and all the correlation coefficients are higher than 0.988.Based on the equation,annual growth of the seedlings can be divided into four periods,namely survival period,pre-growth period,fast-growth period and post-growth period.In the three experimental areas,average height and ground diameter in fast-growth period are 64.2%, 68.7%,67.6% and 59.0%,62.2%,58.9% of the total annual growth respectively.Growth performance of each period is also described and discussed.This paper has provided theoretical basis for the production of high quality poplar seedlings and enhancement of land productivity.The conclusion is drawn as the following: the most suitable breed for Chao'Er experimental area is Populus sua veolens Fisch,for A'Lihe area and Da'Yangshu area is Populus psedosimonii×nigra CV'Baicheng'.