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- Title
Similar responses in morphology, growth, biomass allocation, and photosynthesis in invasive Wedelia trilobata and native congeners to CO enrichment.
- Authors
He, Liping; Kong, Jijun; Li, Guixiang; Meng, Guangtao; Chen, Ke
- Abstract
Both global change and biological invasions threaten biodiversity worldwide. However, their interactions and related mechanisms are still not well elucidated. To elucidate potential traits contributing to invasiveness and whether ongoing increase in CO aggravates invasions, noxious invasive Wedelia trilobata and native Wedelia urticifolia and Wedelia chinensis were compared under ambient and doubled atmospheric CO concentrations in terms of growth, biomass allocation, morphology, and physiology. The invader had consistently higher leaf mass fraction (LMF) and specific leaf area than the natives, contributing to a higher leaf area ratio, and therefore to faster growth and invasiveness. The higher LMF of the invader was due to lower root mass fraction and higher fine root percent. On the other hand, the invader allocated a higher fraction of leaf nitrogen (N) to photosynthetic apparatus, which was associated with its higher photosynthetic rate, and resource use efficiency. All these traits collectively contributed to its invasiveness. CO enrichment increased growth of all studied species by increasing actual photosynthesis, although it decreased photosynthetic capacities due to decreased leaf and photosynthetic N contents. Responses of the invasive and native plants to elevated CO were not significantly different, indicating that the ongoing increase in CO may not aggravate biological invasions, inconsistent with the prevailing results in references. Therefore, more comparative studies of related invasive and native plants are needed to elucidate whether CO enrichment facilitates invasions.
- Subjects
PHOTOSYNTHESIS; PHOTOADDITION; PLANT photorespiration; BIODIVERSITY; NUMBERS of species; ECOLOGICAL heterogeneity
- Publication
Plant Ecology, 2018, Vol 219, Issue 2, p145
- ISSN
1385-0237
- Publication type
Article
- DOI
10.1007/s11258-017-0784-0