论文部分内容阅读
2013年10月对江苏省宜兴市丘陵茶园秋季杂草发生种类、数量、高度等进行调查,将其转换成相对多度和重要值数据,在此基础上计测了宜兴丘陵茶园28种主要杂草的生态位宽度和生态位重叠值,用DCA排序法作出反映杂草生态学相似程度的DCA排序图,并对不同样地杂草类群进行聚类分析。结果表明:宜兴市丘陵茶园秋季杂草共发现80种,分属40科71属,其中,发生频率>20%的杂草有28种。28种主要杂草中,蓬蘽(Rubus hirsutus)、大巢菜(Vicia sativa)、酢浆草(Oxalis corniculata)、毛鸡矢藤(Paederia scandens var.tomentosa)、野老鹳草(Geranium carolinianum)等5种杂草实际生态位较宽,为宜兴茶园秋季最主要的杂草(恶性杂草);蓬蘽、毛鸡矢藤、苦苣(Sonchus oleraceus)、小飞蓬(Conyza canadensis)、马唐(Digitaria sanguinalis)、野茼蒿(Crassocephalum crepidioides)、一点红(Emilia sonchifolia)、乌敛莓(Cayratia japonica)、附地菜(Trigonotis peduncularis)、牛筋草(Eleusine indica)、爵床(Rostellularia procumbens)和狗尾草(Setaira viridis)之间生态位重叠值较大,对资源的竞争较为激烈,因此,其构成的杂草群落对茶树产生较大的危害;通过样地杂草相似性聚类分析,可将样地聚成5个明显类群:基质岩土不翻耕茶园,未翻耕除草、管理差茶园,翻耕除草、管理良好茶园,翻耕除草、管理精细茶园,不翻耕不化学除草、管理良好老茶园。茶园每个聚类群的秋季杂草优势种明显,群落结构不同。
In October 2013, we investigated the types, quantity and height of weeds in the hilly tea garden in Yixing City, Jiangsu Province, and converted them into relative abundance and important value data. On this basis, we measured 28 major mixed The niche breadth and niche overlap of grass were calculated. DCA ordination maps reflecting weed ecology similarity degree were made by DCA ranking method, and clustering analysis was conducted on different weed populations. The results showed that there were altogether 80 species of weeds in autumn hilly tea garden in Yixing City, belonging to 40 genera and 71 genera. Among them, 28 species occurred in> 20% of the weeds. Rubus hirsutus, Vicia sativa, Oxalis corniculata, Paederia scandens var.tomentosa, Geranium carolinianum and other 5 species of 28 main weeds, The species of weeds have a wide range of niche, which is the most important weed (vicious weed) in the autumn of Yixing Tea Plantation; pomfret, Sonchus oleraceus, Conyza canadensis, Digitaria sanguinalis , Crassocephalum crepidioides, Emilia sonchifolia, Cayratia japonica, Trigonotis peduncularis, Eleusine indica, Rostellularia procumbens and Setaira viridis) had greater niche overlap and competition for resources. Therefore, the weed community constituted a greater hazard to the tea plant. Through similarity clustering analysis of weeds in sample plots, There are 5 distinct groups: the matrix soil does not tumble the tea garden, the non-tillage weeding, the poor tea management, the tillage weeding, the well-managed tea garden, the tillage weeding, the management of the fine tea garden, the no plowing, the chemical weeding and the well-managed old tea gardenThe dominant species of autumn weeds in each cluster in the tea plantation were obvious, with different community structures.