Species composition and distribution pattern of weed communities in Chongqing metropolis

WU Xue; HUANG Li; JIN Cheng; QIAN Shenhua; YANG Yongchuan

doi:10.3969/j.issn.1000-5641.201931002

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WU Xue, HUANG Li, JIN Cheng, QIAN Shenhua, YANG Yongchuan. Species composition and distribution pattern of weed communities in Chongqing metropolis[J]. Journal of East China Normal University (Natural Sciences), 2020, (2): 98-109. doi: 10.3969/j.issn.1000-5641.201931002

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WU Xue, HUANG Li, JIN Cheng, QIAN Shenhua, YANG Yongchuan. Species composition and distribution pattern of weed communities in Chongqing metropolis[J]. Journal of East China Normal University (Natural Sciences), 2020, (2): 98-109. doi: 10.3969/j.issn.1000-5641.201931002

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Species composition and distribution pattern of weed communities in Chongqing metropolis

doi: 10.3969/j.issn.1000-5641.201931002

Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing　400045, China

Received Date: 2019-01-28
Publish Date: 2020-03-01

Abstract

Abstract

We arranged 86 1 km × 1 km vegetation surveying plots in Chongqing metropolis using the grid method. The plots were used to investigate the species composition and distribution pattern of weed communities in the context of rapid urbanization. The findings of the study were as follows: ① 301 weed species belonging to 223 genera and 69 families were recorded. Among the recorded species, species of the Compositae and Gramineae were the most abundant; ② Annual weeds and dwarf weeds were the dominant types of weed species; ③ The weed communities in Chongqing metropolis were primarily comprised of native species. There were 31 exotic weed species and 11 invasive weed species recorded in the study; ④ The similarities in weed species composition across high-, medium- and low-urbanization areas were low. Additionally, the composition of dominant species within the weed community varied by area; ⑤ Urbanization had impacted weed biodiversity, evidenced by the lower number of weed species and the Shannon-Wiener diversity index in the high urbanization areas compared to that of the medium and low urbanization areas; ⑥ The number of weed species in the 86 sample plots showed a polycentric pattern with increasing distance between the survey plot and city center. Overall, urbanization had a significant impact on the composition and diversity of weed communities in mountainous multi-center cities, but the urbanization gradient of weed species is different from that of plain single-center cities.
- urban weeds,
- species composition,
- diversity pattern,
- urbanization,
- mountainous cities

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References(43)

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