完全水淹条件下空心莲子草的生长、存活及出水后的恢复动态研究  

Effects of Submergence on Growth,Survival and Recovery Growth of Alternanthera philoxeroides

作　　者：王海锋[1] 曾波[1] 李娅[1] 乔普[1] 叶小齐[1] 罗芳丽[1] 

机构地区：[1]西南大学三峡库区生态环境教育部重点实验室,西南大学重庆市三峡库区植物生态与资源重点实验室西南大学生命科学学院,重庆400715

出　　处：《武汉植物学研究》2008年第2期147-152,共6页Journal of Wuhan Botanical Research

基　　金：国家自然科学基金资助项目(30440035,30500041,30770406);教育部新世纪优秀人才支持计划项目(NCET-06-0773);国家科技支撑计划(2006BAC10B01);重庆市科技攻关项目(CSTC2007AB7049);中国科学院西部行动计划(KZCX2-XB2-07)

摘　　要：为了判断入侵植物空心莲子草(Alternanthera philoxeroides)能否在河岸带的水淹环境中生存,实验研究了空心莲子草在30、60、90 d和120 d的完全水淹条件下的形态变化、生物量变化、存活及出水后的恢复生长状况。结果发现,空心莲子草在完全水淹条件下分枝的伸长生长加剧,并能快速产生新的叶片,但总生物量及地下部分生物量显著降低。空心莲子草在完全水淹处理后有很高的存活率,淹没120 d后存活率仍高达90%。水淹处理结束后,植株能够迅速地开始恢复生长,但恢复生长能力随着水淹持续时间的延长而逐渐降低。结果表明,空心莲子草有很强的水淹耐受能力,能够在江河河岸带生存,但在水淹持续时间较长的距水面较近的地段可能生长较差。Alternanthera philoxeroides is an invasive plant species in China. To confirm whether it can survive the flooding condition on riverbanks, we measured the morphological adaptation, biomass reduction and survival of A. philoxeroides subjected to 30 d, 60 d, 90 d and 120 d submergence as well as recovery growth after de-submergence. Submergence greatly enhanced shoot elongation and new leaves generation, but it also resulted in notable decrease in total biomass and belowground biomass. Submergence had less effect on survival of A. philoxeroides ,the survival of the plants was still 90% after 120 d submergence. A. philoxeroides could regrow quickly after de-submergence, but the recovery ability decreased with the durations of submergence. The results indicated that A. philoxeroides is a submergence-tolerant species, it can distribute naturally on riverbanks, but it maybe perform badly on the low-elevation site on riverbanks which subjected to prolonged submergence.

关 键 词：空心莲子草 完全水淹 存活率 恢复生长 

分 类 号：Q948.1[生物学—植物学]