用同位素示踪技术研究光照强度对人参吸肥性能及光合作用的影响  

STUDY ON THE EFFECT OF LIGHT INTENSITY ON ROOT ABSORPTIVITY AND PHOTOSYNTHESIS OF GINSENG BY USING ISOTOPIC LABELLING TECHNIQUES

作　　者：金龙南[1] 冯春生[1] 兰进[1] 高金方[1] 

机构地区：[1]吉林省农科院原子能利用研究所

出　　处：《吉林农业科学》1989年第1期80-83,共4页Journal of　Jilin Agricultural Sciences

摘　　要：为了明确人参高产的适宜遮荫方式,用^(14)C和^(32)F同位素示踪法测定了不同透光棚下人参的光合速率和根系吸收性能。试验证明人参的光饱和点约为20Klx,相当于透光率25％。超过20Klx光照的人参,光合速率下降,叶包变黄;透光30％处理的人参,根系吸收^(32)P量也较透光10％处理有所下降。因此,适宜棚式的设计,应是延长接近饱和光强的日照时间,而最大透光率以不超过25％为宜。In order to define suitable shading way of ginseng, the photosynthetic rate and root absorptivity of ginseng were measured bY using ^(14)C and ^(32)P isotops as tracers under various light intensity. The result showed that saturation light intensity of ginseng was 20Klx or 25％ LTR (light transparent rate). When ginseng grown under light intensity more than 20 Klx, photorsynthetie rate lowered, color of leaves changed yellowish, as'ginseng grown under 30％ LTR, that root of ginseng absorbed the a mount of ^(32)p was lower than under 10％ LTR. Therefore suitable shading way of ginseng should extend duration of sunshine, the greatest light intensity should not be more than 25％.

关 键 词：人参 光照强度 吸肥性能 光合作用 

分 类 号：S567.510.1[农业科学—中草药栽培]