茅山丘陵地区茶园秋季杂草种群生态位

2013年10月对茅山丘陵茶园秋季杂草的发生种类、数量、高度等进行调查,将其转换成相对多度和重要值数据,在此基础上计测了茅山丘陵茶园22种主要杂草的生态位宽度和生态位重叠值。结果表明:茅山丘陵茶园秋季杂草共发现80种,隶属36个科、74个属。其中,发生频率20%的杂草有22种。22种杂草中,马唐(Digitaria sanguinalis)、小飞蓬(Conyza canadensis)、小旱稗(Echinochloa crusgalli var.austro-japonensis)、牛筋草(Eleusine indica)等4种杂草实际生态位较宽,为茅山丘陵地区茶园秋季优势杂草;马唐、小旱稗小飞蓬、牛筋草、酢浆草(Oxalis corniculata)、泥胡菜(Hemistepta lyrata)、繁缕(Stellaria media)、铁苋菜(Acalypha australis)、族生卷耳(Cerastium caespitosum)、苦苣(Sonchus oleraceus)等杂草生态位重叠值较大,说明它们对资源的竞争较为激烈。

Ecological Niche Relationships of Autumn Weeds in Tea Gardens in Maoshan Hilly Regions of Jiangsu Province

A survey was conducted in tea gardens in Maoshan hilly regions of Jiangsu Province to investigate the weed spe-cies present and their density and height in October,2013.Data were transformed into weed relative abundance and im-portance values.The niche breadth and niche overlap values of selected 22 main weeds with 20%frequency were calcu-lated.There were 80 weed species,belonging to 74 genera of 36 families..Among the selected 22 species,four weeds, Digitaria sanguinalis,Conyza canadensis,Echinochloa crus galli var.austro -japonensis,and Eleusine indica had wider niche breadth than other species,ans represent the most important weeds in autumn Maoshan hilly tea gardens.The high-est niche overlap values were found in D.sanguinalis,E.crusgalli var.austro-japonensis,C.canadensis,E.indica, Oxalis corniculata,Hemistepta lyrata,Stellaria media,Aca-lypha australis,Cerastium caespitosum and Sonchus olera-ceus,all of them being highly competitive for resources.