断根时间和断根半径对菊芋根系生物量及其水平分布的影响  

Effect of root pruning radius and time on root biomass and horizontal distribution in Helianthus tuberosus

作　　者：朱铁霞[1] 高凯[1] 王琳[1] 高阳[1] Zhu Tie-xia;Gao Kai;Wang Lin;Gao Yang(Inner Mongolia University for Nationalities,Tongliao 028043,Inner Mongolia,Chin)

机构地区：[1]内蒙古民族大学农学院,内蒙古通辽028043

出　　处：《草业科学》2018年第6期1510-1516,共7页Pratacultural Science

基　　金：国家自然科学基金(31560672);内蒙古科技英才项目(NJYT15B17);内蒙古自治区青年创新拔尖人才项目(2015QNCXRCO2);内蒙古自治区草原英才项目(CYYC7025)

摘　　要：通过对不同断根时间和断根半径条件下菊芋(Helianthus tuberosus)的主根、一级侧根、须根、根茎生物量及水平分布情况进行观测和分析,探讨断根对菊芋根系生物量及水平分布的影响,阐明断根对菊芋块茎生物产量的影响机制。结果表明,断根处理显著提高菊芋根系、主根、一级侧根、须根、根茎生物量(P<0.05),且随着断根半径的增加均呈逐渐降低趋势;随断根时间延迟,根系、主根、一级侧根、须根、根茎生物量均呈先增加后降低趋势;根系、一级侧根、须根、根茎生物量均随距离主根中心距离的增加呈逐渐减少趋势;断根时间和半径对根系、一级侧根、须根、根茎生物量的影响随着距离主根中心距离的增加逐渐减弱。Studying the effects of the root pruning radius and time on root biomass and horizontal distribution in Helianthus tuberosus clarified the influence mechanism of cutting the roots regarding tuber yield from the change in root biomass and horizontal distribution under different cutting root treatments.The results showed that the biomasses of the main root,root,primary root,rhizome,and fibrous root were significantly higher than that of the root that was not cut（P〈0.05）,and the biomasses of the main root,root,primary root,rhizome,and fibrous root showed a decreasing trend with an increase in the root cutting radius.The root,main root,primary root,rhizome,and fibrous root biomass showed first an increase and then a decrease that was aligned with the cutting root time delay.The root,main root,primary root,rhizome,and fibrous root biomasses decreased gradually with an increase in the distance from the main root center under the root cutting treatments.The effect of root pruning time and radius on the root,main root,primary root,rhizome,and fibrous root biomasses decreased as the distance from the main root center.

关 键 词：菊芋 断根 根系 一级侧根 须根 根茎 生物量 

分 类 号：S632.9[农业科学—蔬菜学] Q945.79[农业科学—园艺学]