无患子不同苗龄苗木造林初期效果分析

摘要

Taking the soapberry seedling whose age is 1 to 4A to conduct the afforestation comparison experi‐ment ,the article studies the preserving rate ,diameter ,crown width and frost victimization of the soapberry seedling w hen the age of stand reaches 7 years .T he results indicate that the average preserving rate and di‐ameter reach the highest when adopting the seedling age of 4A (investigation after 3A of afforestation) , w hich is respectively 97 .3% and 5 .9 cm ;in terms of the average crow n ,soapberry w hose seedling age is 3A (investigation after 4A of afforestation) is the largest ,which reaches 3 .8m .The lowest frost victimization rate happens in soapberry w hose seedling age is 4A ,w hich is 2 .9% .%采用苗龄1～4年生无患子苗木进行了造林对比试验，并且在林龄7年时分别对无患子的保存率、地径、冠幅、霜冻受害情况进行了调查，结果表明：采用苗龄4年生无患子（造林后3年后调查）的平均保存率、平均地径最高，分别为97．3％，5．9cm ；平均冠幅以苗龄3年生（造林后4年后调查）的无患子最大，为3.8m。霜冻受害率以苗龄4年生无患子最低，为2.9％。