Consistent ozone-induced decreases in pasture forage quality across several grassland types and consequences for UK lamb production

Hayes, Felicity; Mills, Gina; Jones, Laurence; Abbott, John; Ashmore, Mike; Barnes, Jeremy; Cape, J. N.; Coyle, Mhairi; Peacock, Simon M.; Rintoul, Naomi; Toet, Sylvia; Wedlich, Kerstin V.; Wyness, Kirsten

doi:10.1016/j.scitotenv.2015.10.128

Cited by 23 publications

(15 citation statements)

References 40 publications

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“…However, lignin was increased by O3 exposure in T. repens and T. pratense in a free-air O3 fumigation facility in Wisconsin , and in T. repens and Paspalum notatum in two OTC experiments in Alabama USA (Muntifering et al, 2000, Gilliland et al, 2016. A combined analysis of several pasture communities from the UK showed a moderate increase in lignin content with increasing O3 exposure (Hayes et al, 2016). These results are in agreement with the ones presented in this study.…”

Section: T Cherleri B Maxima and Bromus Hordeaceussupporting

confidence: 91%

“…Higher lignin contents have also been reported for perennial communities growing in the UK (Hayes et al, 2016). …”

Section: T Cherleri B Maxima and Bromus Hordeaceusmentioning

confidence: 78%

“…Some studies with grasslands showed that the loss of nutritional quality is an important response after O3 exposure (Hayes et al, 2016).…”

Section: Effect On Nutritive Qualitymentioning

confidence: 99%

“…Ozone exposure has been shown to increase the lignification of many annual herbaceous species such as B. maxima, T. subterraneum, T. cherleri, Bromus hordeaceus (Sanz et al, 2005. Among perennial species, the results varied between experiments and species (González-Fernández et al, 2008;Muntifering et al, 2006;Gilliland et al, 2016;Hayes et al, 2016).…”

Section: Different Effects Of N and O3 On Nutritive Qualitymentioning

confidence: 99%

“…In spite of their importance, these quality effects are much less studied and have been reported for a few forage plants and plant communities (Muntifering et al, 2000;Powell et al, 2003;Hayes et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Productivity and quality of dehesa pastures in relation to global change : increasing tropospheric ozone and nitrogen deposition

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Resumen X que a los niveles ambientales del contaminante. Por ello, se recomienda que los análisis de riesgo de O3 para pastos anuales se basen siempre en niveles críticos basados en flujos (POD). El uso de modelos de crecimiento del pasto, ligados a la aproximación multi-específica del DO3SE para el cálculo de la absorción de O3 a escala de dosel, son mas precisos para refinar los análisis de riesgo que los basados en índices de concentración como el AOT40. biomass species composition and gas exchange response parameters were measured, as well as forage quality parameters that are usually less studied. Based on the quantification of the effects, and the modelling exercises for calculating O3 uptake inside the plants through a new multi-species approach of the Deposition of Ozone and Stomatal Exchange (DO3SE) model, new O3 exposure-and doseresponse relationships were derived and threshold limits (critical levels) for this pollutant were proposed for the protection of annual communities. The canopy approach is a novel consideration which brings forward the current individual species approach. Moreover, three years of field data on growth, phenology and species composition from a natural Dehesa pasture were collected and analyzed. ABSTRACTFinally, based on all the information available, a 3-years O3-risk assessment study was performed for a natural Dehesa pasture. The pasture yield at canopy level showed similar response patterns to the treatments for the two growing seasons analysed: O3 caused a yield loss that was partially mitigated by N-fertilization; simultaneously, O3 reduced the fertilization effect of N. Accordingly, O3 decreased the community Gross Primary Production Abstract XV due to both a global reduction of ecosystem CO2 exchange and an increase of ecosystem respiration. The results at the species level showed heterogeneous responses to both factors, O3 and N. Legumes did not react to N but were very sensitive to O3:Trifolium species responded negatively, while Ornithopus responded positively, taking advantage of the greater sensitivity of clovers to O3. Thus, the legumelegume competition plays an important role in the system under polluted environments. The grasses and the herb were more O3-tolerant than the Trifolium but more responsive to N, especially the grasses. The significant interactions between factors followed the general pattern described at canopy scale, a loss of effectiveness of N in O3-polluted atmospheres and an ability of the fertilizer to counterbalance the damage induced by O3; but both effects were dependent on the species, and on the O3 and N levels. The direction of the interaction can reverse if N is too high at the highest O3 levels, as it was found for T. striatum roots. In this situation, the fertilizer increased the O3-induced root reduction. Both factors might affect the competitive relationships among species through their heterogeneous responses to O3 and N, affecting the structure and composition of Mediterranean annual pastures.Ozone and N-inputs also affected the car...

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Section: T Cherleri B Maxima and Bromus Hordeaceussupporting

confidence: 91%

“…Higher lignin contents have also been reported for perennial communities growing in the UK (Hayes et al, 2016). …”

Section: T Cherleri B Maxima and Bromus Hordeaceusmentioning

confidence: 78%

“…Some studies with grasslands showed that the loss of nutritional quality is an important response after O3 exposure (Hayes et al, 2016).…”

Section: Effect On Nutritive Qualitymentioning

confidence: 99%