论文部分内容阅读
过去杨树在乌克兰防护林营造中所占的地位不大,只常见于果园防护林和护路林。一般杨树护田林带共栽植五行,除杨树外还栽植其它乔灌木,株行距为1.5×0.7米,但各种造林技术没有考虑到杨树的生物学特性。近几年来不仅在国营造林中,而且在防护林带中广泛推广杨树造林,因此有必要总结营造杨树林带的经验,并提出有效的造林方法。在哈尔科夫、波尔塔瓦和苏姆斯克州的集体农庄和国营农场里所进行的调查,进一步明确了林带组成、行数与株行距,最适宜的杨树种及各种苗木的应用等问题。在波尔塔瓦州的鲁别斯克区,我们调查了两条五
In the past poplar shelter in Ukraine to build the status of small, only common in the orchard shelterbelts and forest road. In general, poplar and natural forest belts planted a total of five elements. Apart from the poplar trees, other trees and shrubs were also planted. The row spacing was 1.5 × 0.7 meters, but various afforestation techniques did not take into account the biological characteristics of poplar trees. In recent years, not only state-owned afforestation but also popularization of poplar afforestation in shelterbelts has made it necessary to sum up the experience of building poplar belts and put forward effective afforestation methods. Surveys carried out in collective farms and state farms in Kharkov, Poltava and Somsk districts further clarified the composition of the belt, the number of rows and lines, the most suitable poplar species and the various seedlings Application and other issues. In the Lubusz district of Poltava, we investigated two of five