UV-B has larger negative impacts on invasive populations of Triadica sebifera but ozone impacts do not vary  

作　　者：Hong Wang Xiaochi Ma Ling Zhang Evan Siemann Jianwen Zou 

机构地区：[1]College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China [2]Department of Biosciences,Rice University,Houston,TX 77005,USA [3]College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China

出　　处：《Journal of Plant Ecology》2016年第1期61-68,共8页植物生态学报（英文版）

基　　金：National Natural Science Foundation of China(NSFC 41225003);the Ministry of Education 111 project(B12009);Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD);China Scholarship Council;US-NSF(DEB 0820560).

摘　　要：Aims Abiotic stresses may interact with each other to determine impacts on plants so that their combined impact is less than or more than additive.Increasing UV-B radiation and surface ozone(O3)are two major components of global change that may have such interactive impacts.Moreover,invasive and native populations of plants may respond differently to stresses as they can vary in primary and secondary metabolism.Methods Here,we conducted a factorial field experiment with open-top chambers assigned to an ozone treatment(ambient,100 ppb,or 150 ppb)and UV-B treatment(ambient or increased 20%).We grew seedlings of native and invasive populations of Triadica sebifera in these chambers for one growing season.Important Findings Invasive plants grew faster than native plants in ambient UV-B but they did not differ significantly in elevated UV-B.Litter production of invasive plants was especially sensitive to UV-B in a way that increased with UV-B for native plants but decreased for invasive plants which may be important for nutrient cycling.In ambient UV-B,total mass decreased as ozone increased.Total mass was lower with elevated UV-B but there was no additional impact of increasing ozone.Leaf area did not decrease with UV-B so SLA and LAR were lowest at ambient ozone levels.These results suggest that the effects of ozone will depend on UV-B conditions perhaps due to changes in foliar traits.The traits that allow invasive populations of plants to be successful invaders may make them especially sensitive to UV-B which may reduce their success in future climatic conditions.

关 键 词：INVASIVE UV-B O3 CROSS-TOLERANCE LITTER 

分 类 号：Q94[生物学—植物学]