论文部分内容阅读
我国在1972年从意大利引进的六个黑杨派无性系(I—63、I—69、I—72、I—45、I—214和加龙杨),在江苏、湖北,湖南、山东、河南等地栽植,经早期观测,68杨、69杨、72杨、45杨均显示出生长异常迅速的优良特性。如山东省单县5年生69杨树高16.5米,胸径21.5厘米,单株立木材积0.2337立方米;河南省农林科学院试验林场,4年生69杨树高14.4米,胸径19.3厘米,单株立木材积0.1614立方米。均超过当地推广的杨树品种。但这些无性系的原产地或国内其他引种地,不仅气温较高,而且降水量和相对湿度较大,和我省的气候条件相差比较悬殊。为了探讨这些新品系能否在我
Six clonal Poplar clones (I-63, I-69, I-72, I-45, I-214 and Garong Yang) introduced from Italy in 1972 in China were distributed in Jiangsu, Hubei, Hunan, Shandong, Henan and other places planted, the early observation, 68 Yang, 69 Yang, 72 Yang, 45 Yang all showed abnormal growth of the excellent characteristics. For example, the 69-year-old poplar with a height of 16.5 meters and a breast diameter of 21.5 cm in a single county of Shandong Province has a breast diameter of 0.2337 cubic meters. Henan Experimental Academy of Agriculture and Forestry has a height of 14.4 meters and a diameter of 19.3 centimeters. More than popularized poplar varieties. However, the origin of these clones or other domestic introduction, not only high temperatures, and precipitation and relative humidity larger, and the difference between the weather conditions in our province disparity. In order to explore these new lines whether in me