Ozone and increased nitrogen supply effects on the yield and nutritive quality of Trifolium subterraneum

Sanz, J.; Muntifering, Russell B.; Bermejo, V.; Gimeno, B.S.; Elvira, Susana

doi:10.1016/j.atmosenv.2005.06.022

Cited by 53 publications

(58 citation statements)

References 32 publications

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“…This is in agreement with previous studies where the ADF, NDF and lignin content increased with elevated ozone in T. subterraneum (Sanz et al, 2005) and Briza maxima (Sanz et al, 2011), and increased lignin content was found in T. repens and T. pratense exposed to ozone in a free-air fumigation system . Some other studies have shown that the content of 'desirable' parameters such as protein can also increase with increasing ozone exposure (e.g.…”

Section: Discussionsupporting

confidence: 93%

“…Nutritive quality of Trifolium subterraneum was decreased by 20% with ozone concentrations of approximately 56 ppb compared to charcoal-filtered air (Sanz et al, 2005), in addition to a decrease in biomass. The change in nutritive quality in the Sanz et al (2005) study was shown to be due to increased concentrations of "acid detergent fibre" (ADF), "neutral detergent fibre" (NDF) and lignin. In addition, the RFV of clover monocultures has been shown to be 2.4 times greater than that of equivalent grass (L. perenne) mesocosms (González-Fernández et al, 2008), implying that a decrease in clover content of pasture would cause a decrease in RFV.…”

Section: Introductionmentioning

confidence: 90%

“…The dotted horizontal line indicates the calculated minimum level of metabolisable energy for lamb growth (6.84 MJ/kg). Also shown are datapoints available from published literature for clover using the combined data from González-Fernández et al (2008) and Sanz et al (2005) using Trifolium repens and Trifolium subterraneum respectively (these points were not included in the analysis or the overall response function, but are shown for information as these are more representative of high-quality pasture and this is referred to in the discussion). These areas are where predicted ozone increases are moderate, but these correspond with areas of large lamb numbers ( Figure 6).…”

Section: Derived Quality Parametersmentioning

confidence: 99%

“…It has been demonstrated that early season ozone exposure (non-filtered air + 50 ppb) of Poa pratensis in mesocosms decreased RFV by 8%, despite no reduction in biomass production (Bender et al, 2006). Nutritive quality of Trifolium subterraneum was decreased by 20% with ozone concentrations of approximately 56 ppb compared to charcoal-filtered air (Sanz et al, 2005), in addition to a decrease in biomass. The change in nutritive quality in the Sanz et al (2005) study was shown to be due to increased concentrations of "acid detergent fibre" (ADF), "neutral detergent fibre" (NDF) and lignin.…”

Section: Introductionmentioning

confidence: 99%

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

Hayes

Mills

Jones

et al. 2016

Science of The Total Environment

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 90%

Section: Derived Quality Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Hayes

Mills

Jones

et al. 2016

Science of The Total Environment

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show abstract

“…These ecosystems are protected by the 92/43/ EEC Habitat Directive and included in the Nature 2000 network. Previous experiments with individual species grown in pots showed that O3 induces visible injury, accelerates senescence and reduces biomass production and consumable food value of some representative species (Bermejo et al, 2003;Gimeno et al, 2004a,b;Sanz et al, 2005Sanz et al, , 2007Sanz et al, , 2011. Interestingly, nitrogen fixing legumes, with high nutritive quality for herbivorous feeding, were more O3 sensitive than grasses (Bermejo et al, 2003;Gimeno et al, 2004a).…”

Section: Introductionmentioning

confidence: 98%

Current ozone levels threaten gross primary production and yield of Mediterranean annual pastures and nitrogen modulates the response

Calvete-Sogo

Elvira

Sanz

et al. 2014

Atmospheric Environment

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Pastures are among the most important ecosystems in Europe considering their biodiversity and distribution area. However, their response to increasing tropospheric ozone (O3) and nitrogen (N) deposition, two of the main drivers of global change, is still uncertain. A new Open-Top Chamber (OTC) experiment was performed in central Spain, aiming to study annual pasture response to O3 and N in close to natural growing conditions. A mixture of six species of three representative families was sowed in the field. Plants were exposed for 40 days to four O3 treatments: filtered air, non-filtered air (NFA) reproducing ambient levels and NFA supplemented with 20 and 40 nl I -1 O3. Three N treatments were considered to reach the N integrated doses of "background", +20 or +40 kg N ha -1 . Ozone significantly reduced green and total aboveground biomass (maximum reduction 25%) and increased the senescent biomass (maximum increase 40%). Accordingly, O3 decreased community Gross Primary Production due to both a global reduction of ecosystem CO2 exchange and an increase of ecosystem respiration. Nitrogen could partially counterbalance O3 effects on aboveground biomass when the levels of O3 were moderate, but at the same time O3 exposure reduced the fertilization effect of higher N availability. Therefore, O3 must be considered as a stress factor for annual pastures in the Mediterranean areas.

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Heterogeneous responses to ozone and nitrogen alter the species composition of Mediterranean annual pastures

Calvete-Sogo¹,

González-Fernández²,

Sanz³

et al. 2016

Oecologia

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Air pollution represents a threat to biodiversity throughout the world and particularly in the Mediterranean area, where high tropospheric ozone (O3) concentrations and atmospheric nitrogen (N) deposition are frequently recorded. Mediterranean annual pastures are among the most important ecosystems in southern Europe due to their high biodiversity and extension. Aiming to study the responses of these communities to the main atmospheric pollutants in the Mediterranean region, an experimental study was performed in an open-top chamber (OTC) facility. A mixture of six species representative of annual pastures was grown under field conditions inside the OTC. Plants were exposed for 39 days to four O3 treatments and three doses of N. The species responded heterogeneously to both factors. 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. The grasses and the herb were more tolerant of O3 and grasses were the most responsive to N. Significant interactions between factors indicated a loss of effectiveness of N in O3-polluted atmospheres and an ability of O3 to counterbalance the damage induced by N input, but both effects were dependent on O3 and N levels. The inclusion of plant competition in the experimental design was necessary to reveal results that would otherwise be missed, such as the positive growth responses under elevated O3 levels. Surprisingly, competition within the legume family played the most important role in the overall response of the annual community to O3. Both tropospheric O3 and N deposition should be considered important drivers of the structure and biodiversity of Mediterranean annual pastures.

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Ozone and increased nitrogen supply effects on the yield and nutritive quality of Trifolium subterraneum

Cited by 53 publications

References 32 publications

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

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

Current ozone levels threaten gross primary production and yield of Mediterranean annual pastures and nitrogen modulates the response

Heterogeneous responses to ozone and nitrogen alter the species composition of Mediterranean annual pastures

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