Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ozone dose–response relationships for spring oilseed rape and broccoli
Abstract Tropospheric ozone is an important air pollutant with known detrimental effects for several crops. Ozone effects on seed yield, oil percentage, oil yield and 1000 seed weight were examined for spring oilseed rape (Brassica napus cv. Ability). For broccoli (Brassica oleracea L. cv. Italica cv. Monaco) the effects on fresh marketable weight and total dry weight were studied. Current ozone levels were compared with an increase of 20 and 40ppb during 8h per day, over the entire growing season. Oilseed rape seed yield was negatively correlated with ozone dose indices calculated from emergence until harvest. This resulted in an R 2 of 0.24 and 0.26 (p <0.001) for the accumulated hourly O3 exposure over a threshold of 40ppb (AOT40) and the phytotoxic ozone dose above a threshold of 6nmolm−2 s−1 (POD6) respectively. Estimated critical levels, above which 5% yield reduction is expected, were 3.7ppmh and 4.4mmolm−2 respectively. Our results also confirm that a threshold value of 6nmols−1 m−2 projected leaf area, as recommended for agricultural crops (UNECE, ), can indeed be applied for spring oilseed rape. The reduction of oilseed rape yield showed the highest correlation with the ozone uptake during the vegetative growth stage: when only the first 47 days after emergence were used to calculate POD6, R 2 values increased up to 0.476 or even 0.545 when the first 23 days were excluded. The highest ozone treatments, corresponding to the future ambient level by 2100 (IPCC, ), led to a reduction of approximately 30% in oilseed rape seed yield in comparison to the current ozone concentrations. Oil percentage was also significantly reduced in response to ozone (p <0.001). As a consequence oil yield was even more severely affected by elevated ozone exposure compared to seed yield: critical levels for oil yield dropped to 3.2ppmh and 3.9mmolm−2. For broccoli the applied ozone doses had no effect on yield.
Research highlights ► Up to 30% reduction in oilseed rape seed yield can be expected within 100 years. ► O3-induced seed yield reduction is most significantly correlated to pre-anthesis uptake. ► Broccoli yield is unaffected by moderately elevated ozone concentrations.
Ozone dose–response relationships for spring oilseed rape and broccoli
Abstract Tropospheric ozone is an important air pollutant with known detrimental effects for several crops. Ozone effects on seed yield, oil percentage, oil yield and 1000 seed weight were examined for spring oilseed rape (Brassica napus cv. Ability). For broccoli (Brassica oleracea L. cv. Italica cv. Monaco) the effects on fresh marketable weight and total dry weight were studied. Current ozone levels were compared with an increase of 20 and 40ppb during 8h per day, over the entire growing season. Oilseed rape seed yield was negatively correlated with ozone dose indices calculated from emergence until harvest. This resulted in an R 2 of 0.24 and 0.26 (p <0.001) for the accumulated hourly O3 exposure over a threshold of 40ppb (AOT40) and the phytotoxic ozone dose above a threshold of 6nmolm−2 s−1 (POD6) respectively. Estimated critical levels, above which 5% yield reduction is expected, were 3.7ppmh and 4.4mmolm−2 respectively. Our results also confirm that a threshold value of 6nmols−1 m−2 projected leaf area, as recommended for agricultural crops (UNECE, ), can indeed be applied for spring oilseed rape. The reduction of oilseed rape yield showed the highest correlation with the ozone uptake during the vegetative growth stage: when only the first 47 days after emergence were used to calculate POD6, R 2 values increased up to 0.476 or even 0.545 when the first 23 days were excluded. The highest ozone treatments, corresponding to the future ambient level by 2100 (IPCC, ), led to a reduction of approximately 30% in oilseed rape seed yield in comparison to the current ozone concentrations. Oil percentage was also significantly reduced in response to ozone (p <0.001). As a consequence oil yield was even more severely affected by elevated ozone exposure compared to seed yield: critical levels for oil yield dropped to 3.2ppmh and 3.9mmolm−2. For broccoli the applied ozone doses had no effect on yield.
Research highlights ► Up to 30% reduction in oilseed rape seed yield can be expected within 100 years. ► O3-induced seed yield reduction is most significantly correlated to pre-anthesis uptake. ► Broccoli yield is unaffected by moderately elevated ozone concentrations.
Ozone dose–response relationships for spring oilseed rape and broccoli
De Bock, Maarten (Autor:in) / Op de Beeck, Maarten (Autor:in) / De Temmerman, Ludwig (Autor:in) / Guisez, Yves (Autor:in) / Ceulemans, Reinhart (Autor:in) / Vandermeiren, Karine (Autor:in)
Atmospheric Environment ; 45 ; 1759-1765
15.12.2010
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Ozone effects on yield quality of spring oilseed rape and broccoli
| Elsevier | 2011
British Library Online Contents | 2000
LANDSCAPE SPECIAL - Abercrombie and oilseed rape
Online Contents | 2000
Fracture mechanics of oilseed rape pods
| British Library Online Contents | 1997
Impacts of ozone on the growth and yield of field-grown winter oilseed rape
| Online Contents | 1999