文献类型：期刊文献

中文题名：芦苇(Phragmites australis)抑制四种植物扩散的化感潜力研究

英文题名：Allelopathic potential of Phragmites australis to inhibit invasion of four expanding plant species

作者：叶小齐[1] 吴明[1] 邵学新[1] 李长明[1]

第一作者：叶小齐

机构：[1]中国林业科学研究院亚热带林业研究所浙江杭州湾湿地生态系统国家定位研究站

年份：2015

卷号：0

期号：6

起止页码：48-55

中文期刊名：生态科学

外文期刊名：Ecological Science

收录：CSTPCD;;CSCD:【CSCD_E2015_2016】；

基金：国家自然科学基金(31400378);中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2014QB034)

语种：中文

中文关键词：化感潜力;芦苇群落;生态修复

外文关键词：allelopathic potential; Phragrnites australis community; ecological restoration

分类号：Q948.12;S812.5

摘要：为评估湿地芦苇植物通过化感抑制非芦苇湿地植物扩散的能力,运用实验室生物活性测试的方法,比较了杭州湾湿地围垦区芦苇(Phragmites australis)与其他6种主要禾本科植物的化感潜力。以加拿大一枝黄花(Solidago canadensis)、田菁(Sesbania cannabina)、小飞蓬(Conyza canadensis)和苣荬菜(Sonchus brachyotus)等研究区域扩散植物种为受体,研究了芦苇水提取液对上述物种种子萌发影响。结果表明:(1)除白茅(Imperata cylindrical)外,7种本地禾本科植物水提液浓度(0—2.50 g·100m L^(–1))均和萝卜幼苗胚根长呈极显著的负相关(p<0.001);芦苇具有较强的化感潜力;(2)芦苇根、茎和叶水提液(0、2.5、5.0、10.0 g·100m L^(–1))作用下,不同物种和不同浓度处理下种子萌发指数差异显著(p<0.001),其中加拿大一枝黄花、苣荬菜和小飞蓬3种植物对芦苇水提液较为敏感,而田菁敏感程度较弱。种子萌发指数表现出低浓度(2.5 g·100m L^(–1))促进和高浓度(5.0 g·100m L^(–1)和10.0g·100m L^(–1))抑制的"低促高抑"效应特征。除田菁外,种子胚根长一般随浓度增加而降低。芦苇不同组织部位水提液对4种植物抑制程度按大小依次为叶>茎>根,叶片可能是芦苇化感物质主要来源。芦苇具有较强的化感潜力,其化感作用可能是抑制其他植物扩散的重要机制之一。
Inhibition of some expanding species into Phragmites australis communities is frequently observed. However, the mechanisms of native plants species inhibiting on expanding species are not clear. This study explored the allelopathic potential of P. australis to inhibit those species that may invade the wetland P. australis communities. The effects of water extracts from leaf, stem and root ofP. australis on seed germination index and seed radicle length （root length, shoot height and fresh weight） of Solidago canadensis, Sesbania cannabina, Conyza canadensis and Sonchus brachyotus were measured. The results are as follows. （1） The allelopathic potential of P. australis was relatively high in the selected seven grass specifies from the study area. The radicle length of germinated radish seeds was all negatively correlated with leaf water extracts from the six grass species. （2） The water extracts ofP. australis exposed remarkable effects on the seed germination of the four species. S. cannabina was the least sensitive species among these four plant species. （3） The water extracts of P. australis exhibited promotion effect on seed germination index at low concentration （2.5%） while showed inhibition effect at higher concentration （5% and 10%） in all the three species, except for S. cannabina. The radicle length decreased with the increased extract concentration, except for S. cannabina. （4） The leaf water extract of P australis showed much stronger inhibition effects than the stems and roots. It suggests that leaf might be the major source of allelopathic compounds from P australis. Our results indicate that P. australis from the Hangzhou Bay wetlands reclaimed area has high allelopathic potential and therefore allelopathy may contribute to its ability to resist invasion of some potentially expanding species, but these resisting effects differ with different plant species.