夏伐桑残留叶片光合作用、叶绿素含量及发芽情况的研究

为改进桑树夏伐技术,降低夏伐对桑树树势的影响,促进桑树生长,笔者对湖桑32、新一之濑和云桑2号3个桑品种夏伐后残留叶片的生理作用进行了研究,结果表明,残留叶片的叶绿素含量和光合作用在夏伐后迅速提高,伐后4～5天达到最大值,以后缓慢下降;残留叶还可以减少伤流量,缩短伤流时间;与不留叶对照,保留基部叶片可使每枝桑条平均多发一个新芽且新芽生长速度明显提高;如对残留叶片喷施尿素,则效果更显著。

On Photosynthesis, Chlorophyll Percentage and Budding of Mulberry's Remaining Leaves after Trimming in Summer

In order to improve summer trimming techniques of mulberry trees and minimize its influence on the growth of mulberry trees, the author made a study into the physiological function of remaining leaves of mulberry trees after summer trimming of Husang32, Xinzhiyita and Yunsang2. Results indicate that chlorophyll percentage and photosynthesis increased rapidly and reaches the highest value 4 or 5 days after trimming, and then decrease gradually.