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Ozone exposure- and flux-yield response relationships for maize

Artikel i vetenskaplig tidskrift
Författare Jinlong Peng
Bo Shang
Yansen Xu
Zhaozhong Feng
Håkan Pleijel
Vicent Calatayud
Publicerad i Environmental Pollution
Volym 252
Sidor 1-7
ISSN 0269-7491
Publiceringsår 2019
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 1-7
Språk en
Länkar https://doi.org/10.1016/j.envpol.20...
Ämnesord Critical level, Flux-response relationship, Maize, Ozone uptake, Yield
Ämneskategorier Växtproduktion, Miljövetenskap

Sammanfattning

A stomatal ozone (O3) flux-response relationship for relative yield of maize was established by parameterizing a Jarvis stomatal conductance model. For the function (fVPD) describing the limitation of stomatal conductance by vapor pressure deficit (VPD, kPa), cumulative VPD during daylight hours was superior to hourly VPD. The latter function is proposed as a methodological improvement of this multiplicative model when stomatal conductance peaks during the morning and it is reduced later as it is the case of maize in this experiment. The model agreed relatively well with the measured stomatal conductance (R2 = 0.63). Based on the comparison of R2 values of the response functions, POD6 (Phytotoxic Ozone Dose over an hourly threshold 6 nmol m−2 s−1) and AOT40 (accumulated hourly O3 concentrations over a threshold of 40 ppb) performed similarly. The critical levels based on POD6 and AOT40 for 5% reduction in maize yield were 1.17 mmol m−2 PLA and 8.70 ppm h, respectively. In comparison with other important crops, the ranking of sensitivity of maize strongly differed depending on the O3 metric used, AOT40 or POD6. The newly proposed response functions are relevant for O3 risk assessment for this crop in Asia.

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