Curvilinear effects of invasive plants on plant diversity: Plant community invaded by Sphagneticola trilobata

Shan Shan Qi, Zhi Cong Dai, De Li Zhai, Si Chong Chen, Chun Can Si, Ping Huang, Rui Ping Wang, Qiong Xin Zhong, Dao Lin Du

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The effects of invasive plants on the species diversity of plant communities are controversial, showing either a positive or negative linear relationship. Based on community data collected from forty 5 m65 m plots invaded by Sphagneticola trilobata in eight cities across Hainan Island, China, we found S. trilobata decreased plant community diversity once its cover was beyond 10%. We demonstrated that the effects of invasive/native plants on the plant diversity of communities invaded by S. trilobata were curvilinear. These effects, which showed peaks under different degrees of vegetation cover, appeared not only for S. trilobata and all invasive plants, but also for all native plants. Invasive plants primarily had negative effects on plant diversity when they became abundant at a much lower cover level (less than 35%), compared with the native plants (over 60%). Thus, it is necessary to distinguish a range for assessing the effects of plants, especially invasive plants. Our results also confirmed that the invasion intensity of invasive alien plants increased with the intensity of local economic development. We highlight and further discuss the critical importance of curvilinear effects of biological invasion to provide ideas regarding the conservation of local biodiversity and the management of invasive plants.

Original languageEnglish
Article numbere113964
JournalPLoS ONE
Volume9
Issue number11
DOIs
StatePublished - 26 Nov 2014
Externally publishedYes

ASJC Scopus subject areas

  • General

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