浙北稻麦连作区水直播稻田杂草群落组成及多样性差异

doi:10.19741/j.issn.1673-4831.2020.0134

Abstract

Abstract: The aim of this study was to identify the characterization of weed communities and difference of species diversity among counties in wet direct-seeding paddy rice-wheat rotation areas in northern Zhejiang Province. The weed species was investigated in eleven counties during September to October in 2018 and 2019 by using the sampling method of inverted "W" pattern with nine sampling points. The weed abundance, species diversity, breadth of ecological niche and overlap values of ecological niche were analyzed. The results show that there were 49 weed species belonging to 34 genera of 17 families, and most of them belong to Gramineae and Cyperaceae. There were two dominant weed species (Leptochloa chinensis and Echinochloa crus-galli var. mitis), eight regional dominant weed species (such as Ammannia multiflora, Ludwigia prostrate, Oryza sativa f. spontanea, Leersia hexandra), and thirty-nine normal weed species. Species richness index, Simpson's index and Shannon index in Tonglu County was higher than other counties, while Pielou index of Xiaoshan County was the highest. Hierarchical cluster analysis revealed that weed species in northern Zhejiang Province could be divided into four groups, including Hangzhou group, Huzhou group, Pinghu-Haining-Haiyan group and Xiuzhou-Jiashan group. Niche breadth analysis show that the main weed species such as A. multiflora and E. crus-galli var. mitis had higher niche breadth value. The niche overlap value analysis indicate that 91% of the 300 pairs having the niche overlap value that exceeded 0.7, which indicate that high ecological characteristics similarity exists in resource utilization between the two weed species.

Key words: weed community, diversity, rice-wheat rotation area, wet direct-seeding paddy, region of northern Zhejiang Province

CLC Number:

S314

XU Wei-dong, LI Ju, LU Qiang, WANG Ye-qing. Weed Community Composition and Difference of Diversity in Wet Direct-seeding Paddy Fields in Rice-wheat Rotation Areas in Northern Zhejiang Province[J]. Journal of Ecology and Rural Environment, 2021, 37(1): 57-64.

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Weed Community Composition and Difference of Diversity in Wet Direct-seeding Paddy Fields in Rice-wheat Rotation Areas in Northern Zhejiang Province

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