河北毛白杨苗期生长规律研究

本文研究了毛白杨不同部位插穗在太谷地区的物候差异、日生长规律和年生长规律，其结果是基、中、梢部插穗先芽后根分别相差１０、１７、４０天；１９至１时的生长量占全天生长量的５１．１％，且２１和１时为两个生长高峰，９时生长量最小；一年生扦插苗在速生期（６．１５～８．１４）有一个生长暂缓期（７．２４～３１），故出现一个生长小高峰（７．２４）和一个生长大高峰（８．１４），且速生期地径生长与苗高生长交错进行；一年生平茬苗速生期高，住生长趋势与扦插苗相似，但两个生长高峰分别提前１２和３４天。

A STUDY OF GROWTH RHYTHM OF SEEDLING STAGE FOR P.TOMENTOSA CARR

The phenological difference and the growth rhythm of all day and all year of cutting for P.tomentosa Cars in Taigu were studied.The results showed that the difference of germination first and rooting afterwards of base-mindest-super Cuttings were 10.17 and 40days respectivelyl;Growth in length from 19 to 1 o'cloch make s up 51.1 % of all the day,amd there were two growing peaks at 21:00 and 1:00 and the increment in lehgth is the least at 9: 00;There was a slow growing period from 24 to 31,July,in the fast growth phase(from 15,June to 14,August)of yearling cut so that one small speak(on 24,July)and one big peak(on 14,August)arose ing the growth curve,and the growth between diameter and lehgth in fast growing period staggered;The trend of the growth in diameter and length of stem cut yearlings to cut yearing were similar,but the couple of peaks were moved up for 12 and 34 days separtely.