信阳市杨树优良品种的再筛选

Re-screening of Fine Varieties of Poplar in Xinyang City

以信阳市淮滨县苗圃对比试验林和金光公司丰产林基地的不同杨树品种为研究对象,对其1年生、5年生和10年生林分树高、胸径和抗病虫害能力等进行对比分析,结果表明:I-69、I-72杨苗期和早期(1~5年生)表现平稳,中后期长势和生长量表现越来越好,I-72杨比I-69杨表现更佳;5~10年生时I-72杨的生长量是I-69杨的110%左右,但二者抗逆性较差,易染病虫害。I-69、I-72杨适应信阳地区土壤、气候条件,可在河、湖、渠、港等堤岸边作为防护林大面积栽植;中林46杨、2000系列杨、107杨在信阳地区仅前1~5年生时表现较好,适合3~5 a短期轮伐利用。

Taking the comparative test forest of Huaibin County Nursery Farm in Xinyang City and the different poplar varieties of Jinguang Company's high-yield forest base as the research objects,the tree height,DBH and resistance to diseases and insect pests of 1-year-old,5-year-old and 10-year-old stand were analyzed.The comparative study shows that the performance of poplar Populus‘1-69’and Populus‘1-72’at the seedling stage and early stage(1-5 years old)was stable,and the growth potential and growth volume in the middle and late stages were getting better and better.Populus‘1-72’performed better than Populus‘1-69’;the growth of Populus‘1-72’in 5-10 years is about 110%of that of poplar 1-69,but the two have poor resistance to stress and are susceptible to pests and diseases.Populus‘1-69’and Populus‘1-72’are suitable for the soil and climate conditions in Xinyang Area,and can be planted as shelter forests on banks of rivers,lakes,canals,and ports;the performance of 1-5-year-old Populus‘Zhonglin 46’,2000 series poplar,and P.xeuramericana cv.‘74/76’are optimal in Xinyang Area,and are suitable for short-term rotation of about 3-5 years.