不同生境下喜旱莲子草光合特征及其生长策略  

Photosynthetic Characteristics and Growth Strategies of Alternanthera philoxeroides in Different Habitats

作　　者：贺畅 张运春 He Chang;Zhang Yunchun(College of Environmental Science and Engineering,China West Normal University,Nanchong 637001,Sichuan,China)

机构地区：[1]西华师范大学环境科学与工程学院,四川南充637001

出　　处：《绿色科技》2024年第18期1-6,共6页Journal of Green Science and Technology

摘　　要：入侵植物喜旱莲子草会对本地生态系统造成严重破坏。为评估喜旱莲子草在不同生境下的生长状况,选择西华师范大学4个典型样点进行喜旱莲子草的生理与生长状况的测定。结果显示:①A点(公寓楼下)喜旱莲子草生长的主要环境胁迫为光照强度不足,光合速率降低,对生物量的积累缓慢,植物通过分配更多的生物量于茎的发展以获取更多的光照,植物的生长策略为S策略;②C点(空地空地四周无遮光)喜旱莲子草受到的主要环境胁迫为光照过强,水分不足,植物的光合速率增加,但对生物量的积累缓慢,通过减小叶面积以适应环境胁迫,生长策略为S策略;③C点(农田水淹无遮处)喜旱莲子草受到的环境逆境为水淹胁迫,植物光合作用受到严重抑制,生物量积累缓慢,植物的生长策略为S策略。The invasive plant Alternanthera philoxeroides can wreak havoc on local ecosystems.In order to evaluate the growth status of Alternanthera philoxeroides in different habitats,the physiology and growth status of Alternanthera philoxeroides were measured in 4 typical sample sites of China West Normal University.The results showed that:①the main environmental stress of the growth of the Alternanthera philoxeroides in the downstairs A of the apartment was insufficient light intensity,decreased photosynthetic rate,and slow accumulation of biomass.The plant obtained more light by allocating more biomass to stem development,and the growth strategy of the plant was S strategy.②In open space C,the main environmental stresses were excessive light,insufficient water and increased photosynthetic rate of plants.But the accumulation of biomass was slow.The growth strategy was S strategy by reducing the leaf area to adapt to the environmental stress.③The environmental stress of Alternanthera philoxeroides was flooding stress in the area C of farmland flooding.The photosynthesis of plants was seriously inhibited.The biomass accumulation was slow,and the growth strategy of plants was S strategy.

关 键 词：喜旱莲子草 不同生境 光合荧光特征 生长策略 

分 类 号：Q948.8[生物学—植物学]