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Ozone exposure- and flux-yield response relationships for maize
Peng, Jinlong1; Shang, Bo1; Xu, Yansen1; Feng, Zhaozhong1,2; Pleijel, Hakan3; Calatayud, Vicent4
AbstractA stomatal ozone (O-3) flux-response relationship for relative yield of maize was established by parameterizing a Jarvis stomatal conductance model. For the function (f(VPD)) 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 (R-2 = 0.63). Based on the comparison of R-2 values of the response functions, POD6 (Phytotoxic Ozone Dose over an hourly threshold 6 nmol m(-2) s(-1)) and AOT40 (accumulated hourly O-3 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 O-3 metric used, AOT40 or POD6. The newly proposed response functions are relevant for O-3 risk assessment for this crop in Asia. (C) 2019 Elsevier Ltd. All rights reserved.
KeywordOzone uptake Yield Flux-response relationship Critical level Maize
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Shuangqing Rd 18, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
3.Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Technol, Collaborat Innovat Ctr Atmospher Environm & Equip, Inst Ecol, Nanjing 210044, Jiangsu, Peoples R China
4.Univ Gothenburg, Biol & Environm Sci, POB 461, S-40530 Gothenburg, Sweden
5.Fdn CEAM, C Charles R Darwin 14,Parque Tecnol, Valencia 46980, Spain
Recommended Citation
GB/T 7714
Peng, Jinlong,Shang, Bo,Xu, Yansen,et al. Ozone exposure- and flux-yield response relationships for maize[J]. ENVIRONMENTAL POLLUTION,2019,252:1-7.
APA Peng, Jinlong,Shang, Bo,Xu, Yansen,Feng, Zhaozhong,Pleijel, Hakan,&Calatayud, Vicent.(2019).Ozone exposure- and flux-yield response relationships for maize.ENVIRONMENTAL POLLUTION,252,1-7.
MLA Peng, Jinlong,et al."Ozone exposure- and flux-yield response relationships for maize".ENVIRONMENTAL POLLUTION 252(2019):1-7.
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