毛竹实生苗生物量及光合速率的研究

THE RESEARCH ON BIOMASS AND PHOTOSYNTHESIS OF BAMBOO SEEDLINGS AND INTERRELATED FACTORS

本文研究了毛竹实生苗在圃地条件下相关因子与其生物量及光合速率的变化,取得以下进展:①条件好的圃地上栽培的实生苗,其生物量比差圃地的高。经过施肥处理的实生苗,其生物量是对照的4倍以上。②据毛竹实生苗单叶光—光强曲线的测定,其饱和点和补偿点都比成年毛竹低。在正常的光量子流密度(Q)条件下,单叶光合速率(P_n)早、晚低,10时左右最高,13时左右曲线上出现小的凹陷;在低光量子流密度下,当其他因子变动较小时,其光合速率的变化主要受光量子流密度的影响(Q值升高,P_n值增加,反之,P_n值减少)。

This paper states the research about the changes of bamboo seedlings, the relation between environmental factors and the changes of both biomass and photosynthetic rate. And some progress has been made.1.The height, the length of roots and biomass of the cultivated seedlings in nurseries with better condition are better than those in nurseries with poorer condition. The biomass of the potted seedlings manured is 3 times more than that of not having been manured.2.(1) The light saturation point and compensation point of the seedlings arel ower than those adult bamboos while observing from the measurement of light and the curve of light intensity of single leaf. (2) Under the normal conditions of the density of light quantum current, the photosynthetic rate of single leaf is low in the early morning and evening, and is the highest at 10 in the morning. And small concaves will appear on the curve at about 1 p.m.. Under a low density of light quantum current when the changes of other factors are smaller, the changes of photosynthetic rate (Pn) are mainly affected by light quantum current (Q) (If Q rises up, Pn will increase. On the contrary, Pn will decrease).The results show that if the method of measuring the photosynthesis will be adopted, during the stage of cultivating through effective identification of some management techniques, seedlings cultivated in nurseries have the advantages of small amount of work, a short cycle and precise data over those cultivated in the fields.