Abstract:

In order to understand the occurrence types and community structure of weeds in wheat fields in the mountainous hills of northern Zhejiang, and to achieve sustainable management of weeds in wheat fields, a weed survey was carried out in Xianju County, a typical wheat area in the mountainous areas of northern Zhejiang, and community diversity and cluster analysis were carried out. The results showed that there were 34 species of weeds in the wheat field in Xianju County, belonging to 16 families, and the weeds with relative dominance greater than 10% were Alopecurus aequalis Sobol., Stellaria aquatica (L.) Scop., Cardamine hirsuta L. The diversity of 53 fields was studied, and the average Simpson index was 0.70, the Shannon-Wiener index was 1.53, the Pielou index was 0.74, and the Margalef index was 1.08. The results of cluster analysis showed that the weed community could be divided into four groups. The dominant species in group 1 were Alopecurus aequalis Sobol., Lepidium didymum L., Galium spurium L. The two dominant species in the group 2 were Geranium carolinianum L., Lepidium didymum L., Veronica polita Fries. The dominant species in groups 3 and 4 were Alopecurus aequalis Sobol., Stellaria aquatica (L.) Scop. and Cardamine hirsuta L., but there were differences in the relative dominance of the three weeds in these two groups. To sum up, the malignant weeds in Xianju are Alopecurus aequalis Sobol.and Stellaria aquatica (L.) Scop., and the regional malignant weeds are Cardamine hirsuta L., so it is advisable to choose three herbicides of fluthiachlor, methyl disulfuron, and thiophenesulfuron-methyl with weeding.

Key words: wheat, relative dominance, diversity, community structure