加拿大蓬种子生态适应性及其化感作用  

Study on Ecological Adaptability and Allelopathy of Conyza canadensis Cronq Seeds

作　　者：肖春萍[1] 刘博[1] 杨莉[1] 韩梅[1] 杨利民[1] 

机构地区：[1]吉林农业大学中药材学院,吉林省生态恢复与生态系统管理重点实验室,长春130118

出　　处：《吉林农业大学学报》2011年第5期527-531,535,共6页Journal of Jilin Agricultural University

基　　金：国家自然科学基金项目(30870252);吉林省科技发展计划项目(20050547)

摘　　要：加拿大蓬是我国外来入侵物种中危害最为严重的植物之一。为探讨加拿大蓬生物入侵与其种子萌发之间的关系,本试验对加拿大蓬种子萌发所需温度、光照时间、光照强度、水分、适宜基质、种子生活力及加拿大蓬种子浸提液的潜在化感作用进行了研究。结果表明:加拿大蓬种子最佳萌发条件为20℃、全光照、光照12 h、基质(沙质)含水量为10%。加拿大蓬种子水提液对供试植物种子的萌发及幼苗生长均表现出化感浓度效应,说明加拿大蓬种子广泛的生态适应性及本身的化感作用使其在生物入侵过程中具有优势。Conyza canadensis is one of the most dangerous invasive plants in China.The relationship between biological invasion of Conyza canadensis and its seeds germination was discussed,seven items of Conyza canadensis were researched including temperature,illumination time,strength of illumination,suitable water,suitable matrix,seed viability and allelopathy of Conyza canadensis seeds water extract.The results showed that： the best germination conditions of Conyza canadensis seeds are 20 ℃,entire illumination,illumination for 12 h,10% water content,and sandy matrix.Allelopathy of Conyza canadensis was shown on germination of tested plants seeds and growth of seedlings,indicating the wide ecological adaptability of Conyza canadensis seeds and its allelopathy promoting biological invasion of Conyza canadensis.

关 键 词：加拿大蓬 种子 化感作用 生物入侵 

分 类 号：Q945[生物学—植物学]