中文摘要：

本文旨在探讨适于栒子试管苗移栽的时期和环境条件.在日光温室中于3月底至5月底分3次带坨移栽栒子试管苗,观察苗木移植成活率,并在一天中7：00、12：00和17：00分3次观测栒子试管苗茎长.结果表明,4月29日和5月29日移栽的栒子试管苗成活率分别为93.8%和96.1%,高于3月30日移栽的试管苗（85.9%）;观测期间栒子试管苗一天中,12：00-17：00的茎生长明显快于7：00-12：00;栒子试管苗在15℃以上有明显的茎生长,25-30℃时的茎生长较快.温度是决定栒子试管苗移栽时期的主要因素,温室中日最低温15℃以上、日最高温30℃以下时是移栽适期,在天津地区,大约为4月下旬至5月底为移栽适期.

英文摘要：

This study aimed at researching suitable transplanting period and environmental conditions for Cotoneaster hjelmqvistii plantlet in vitro. In green-house the C. hjelmqvistii plantlets in vitro were transplanted with lump three times in term from March end to May end and the survival rate of the plantlets was observed. The stem length of the C. hjelmqvistii plantlet was respectively measured at 7 o＇clock, 12 o＇clock and 17 o＇clock in one day. The result show that the survival rate of the C. hjelmqvistii plantlet in vitro transplanted on April 29th and May 29th were 93.8% and 96.1%, which were higher than that of the plantlet transplanted on March 30th （85.9%）; During the observation period the stem growth of the C. hjelmqvistii plantlet from 12 o＇clock to 17 o＇clock was obvious higher than the growth from 7 o＇clock to 12 o＇clock; The stem of the C. hjelmqvistii plantlet grew obviously above 15 ℃ and grew more quickly in 25-30℃. Temperature is the determinative fact in transplanting plants. In green-house the suitable transplanting time is the period during which the minimum temperature in a day is above 15℃ and the maximum temperature in a day is under 30℃, which is the period about from the last ten-day period of April to the end of May in Tianjin.