Global climate change and ongoing plant invasion are the two prominent ecological issues threatening biodiversity world wide.Among invasive species,Lantana camara and Hyptis suaveolens are the two most important invad...Global climate change and ongoing plant invasion are the two prominent ecological issues threatening biodiversity world wide.Among invasive species,Lantana camara and Hyptis suaveolens are the two most important invaders in the dry deciduous forest in India.We monitored the growth of these two invasive species and seedlings of four native dry deciduous species(Acacia catechu,Bauhinia variegata,Dalbergia latifolia and Tectona grandis)under ambient(375–395μmol mol^(-1))and elevated CO_(2)(700–750μmol mol^(-1))to study the differential growth response of invasive and native seedlings.Methods Seedlings of all the species were exposed to ambient and elevated CO_(2).After 60 days of exposure,seedlings were harvested and all the growth-related parameters like plant height;biomass of root,stem and leaves;total seedling biomass;R/S ratio;allocation parameters;net assimilation rate(NAR)and relative growth rate(RGR)were determined.Important Findings Biomass,RGR and NAR of all the species increased under elevated CO_(2)but the increase was higher in invasive species and they formed larger seedlings than natives.Therefore under the CO_(2)-enriched future atmosphere,competitive hierarchies could change and may interfere with the species composition of the invaded area.展开更多
文摘Global climate change and ongoing plant invasion are the two prominent ecological issues threatening biodiversity world wide.Among invasive species,Lantana camara and Hyptis suaveolens are the two most important invaders in the dry deciduous forest in India.We monitored the growth of these two invasive species and seedlings of four native dry deciduous species(Acacia catechu,Bauhinia variegata,Dalbergia latifolia and Tectona grandis)under ambient(375–395μmol mol^(-1))and elevated CO_(2)(700–750μmol mol^(-1))to study the differential growth response of invasive and native seedlings.Methods Seedlings of all the species were exposed to ambient and elevated CO_(2).After 60 days of exposure,seedlings were harvested and all the growth-related parameters like plant height;biomass of root,stem and leaves;total seedling biomass;R/S ratio;allocation parameters;net assimilation rate(NAR)and relative growth rate(RGR)were determined.Important Findings Biomass,RGR and NAR of all the species increased under elevated CO_(2)but the increase was higher in invasive species and they formed larger seedlings than natives.Therefore under the CO_(2)-enriched future atmosphere,competitive hierarchies could change and may interfere with the species composition of the invaded area.
