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本文对十个杨树种类(其中有无性系、变种,和种)一年生插条苗的叶、茎和根的生长及相互关系进行了研究。发现各种类生物量的高低与全株总叶面积的大小排列顺序大体相同。各种类叶面积的增长速率与高生长速率之间存在着正相关关系,绝大多数种类的相关系数在0.8—0.9左右。这表明未成熟叶片的光合产物是向上运输到顶端的。观察表明,速生种类叶片数目较少,而放叶间隔期较长,约1.7—2.2天;而生长较慢的种类为1.4—1.6天。对茎生长的研究中发现,生长期的长短不是造成高生长差异的主要原因,而速生期(即高生长速率达2.5cm/天以上)的长短及高生长速率最大值的高低对茎生长的影响很大。最速生的品种72—170的速生期长达99天,最大高生长速率达4.7cm/天;而生长差的种类小叶杨、小美12~#等,速生期仅17天,最大高生长速率分别为4.0cm/天和2.6cm/天。
In this paper, the growth and correlation of leaf, stem and root of annual poplar seedlings of ten poplar species (including clones, varieties and species) were studied. Found that the level of various types of biomass and total leaf area of the size of the order of the same. There is a positive correlation between the growth rate of all kinds of leaf area and the high growth rate. The correlation coefficient of most species is about 0.8-0.9. This indicates that the photosynthate of immature leaves is transported up to the top. Observations showed that the number of fast-growing species was less, while the leaf-opening interval was longer, about 1.7-2.2 days, while the slower-growing species was 1.4-1.6 days. In the study of stem growth, the growth period was not the main reason for the high growth difference, but the fast growth (ie, the high growth rate of 2.5cm / day) and the maximum growth rate of high growth rate on stem growth great influence. The fastest growing varieties of 72-170 fast-growing up to 99 days, the maximum high growth rate of 4.7cm / day; and poor growing species Populus, small America 12 ~ #, fast-growing period of only 17 days, the maximum high growth rate 4.0 cm / day and 2.6 cm / day respectively.