Growth and physiological measurements of Leontodon hispidus and Succisa pratensis after ozone exposure and elevated nitrogen input from an ozone field release system, North Wales, 2016-2018

The data presented are growth and physiological measurements from an ozone exposure experiment, during which grassland forbs, Leontodon hispidus and Succisa pratensis were exposed to low, medium and high ozone treatments over three growing seasons, using an outdoor Free Air Ozone Enrichment system, and with and without the addition of nitrogen during the first year. The plants were planted in April 2016 and were exposed to Low, Medium and High ozone treatments over three growing seasons (May to September 2016-2018). Measurements were taken of light-saturated photosynthesis, stomatal conductance, chlorophyll index, number of flowering stems, leaf ground cover, and the dried weight of litter. All measurements were made by members of the project. The experiments were carried out in the UKCEH Bangor Air Pollution Facility. Work was funded by the UK Centre for Ecology & Hydrology under the Natural Environment Research Council (UK) grant/award NEC05574. For L. hispidus a lower leaf cover was observed with elevated ozone, and there was an increase in litter with added nitrogen. For S. pratensis, elevated ozone reduced flowering and increased foliar damage. Increased litter and accelerated winter die-back with both ozone and nitrogen were also recorded for S. pratensis. These effects have implications for inter- and intra-specific competition, seed establishment, nutrient cycling, as well as the provision of general pollinator resources and highlight the need for concerted action to reduce pre-cursor ozone emissions to go alongside habitat management efforts to protect biodiversity. Full details about this dataset can be found at https://doi.org/10.5285/382baaf2-7795-4aa8-a434-56c9e6bd1516本数据集包含一项臭氧暴露实验的生长与生理指标测定数据。实验采用室外开放式空气臭氧熏蒸系统（Free Air Ozone Enrichment system），选取草原杂类草毛茎猫儿菊（Leontodon hispidus）与草地蓝盆花（Succisa pratensis）为受试物种，设置低、中、高三个臭氧浓度梯度，开展为期三个生长季的暴露处理，并在第一年设置施加氮肥与不施加氮肥两组对照。受试植株于2016年4月定植，在2016-2018年的三个生长季（每年5月至9月）期间接受对应臭氧处理。本次实验测定的指标包括光饱和光合速率、气孔导度、叶绿素指数、花茎数量、叶片地表覆盖度以及枯落物干重，所有测定工作均由项目组成员完成。实验地点位于英国生态与水文研究中心（UK Centre for Ecology & Hydrology, UKCEH）班戈空气污染实验基地。本研究由英国生态与水文研究中心依托英国自然环境研究理事会（Natural Environment Research Council, NERC）项目编号NEC05574的资助开展。针对毛茎猫儿菊的观测结果显示，高臭氧处理下其叶片地表覆盖度显著降低，而施加氮肥则会导致枯落物量增加。对于草地蓝盆花，高臭氧处理会抑制其开花并加重叶片损伤；同时臭氧与氮肥施加均会导致其枯落物量增加、冬季枯萎进程加快。上述实验结果对种间与种内竞争、种子定植、养分循环以及传粉昆虫资源供给均具有潜在影响，同时也凸显出在开展栖息地管理以保护生物多样性的同时，亟需采取协同行动减少臭氧前体物排放。本数据集的完整详细信息可访问以下链接获取：https://doi.org/10.5285/382baaf2-7795-4aa8-a434-56c9e6bd1516