Ozone exposure- and flux-yield response relationships for maize.
Ozone exposure- and flux-yield response relationships for maize.
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DOI：
10.1016/j.envpol.2019.05.088
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发表时间：
2019-05
影响因子：
8.9
通讯作者：
Jinlong Peng;Bo Shang;Yansen Xu;Zhaozhong Feng;H. Pleijel;V. Calatayud
中科院分区：
文献类型：
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作者：
Jinlong Peng;Bo Shang;Yansen Xu;Zhaozhong Feng;H. Pleijel;V. Calatayud
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.该模型与测量的气孔导度吻合较好（R2=0.63）。 Based on the comparison of R2values of the response functions, POD6(Phytotoxic Ozone Dose over an hourly threshold 6 nmol m−2s−1) and AOT40 (accumulated hourly O3concentrations over a threshold of 40 ppb) performed similarly.基于 POD6 和 AOT40 的玉米产量降低 5% 的临界水平分别为 1.17mmolm−2PLA 和 8.70ppmh。与其他重要作物相比，玉米的敏感性排名根据所使用的 O3、AOT40 或 POD6 的不同而有很大差异。新提出的响应函数与亚洲该作物的 O3 风险评估相关。
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 R2values of the response functions, POD6(Phytotoxic Ozone Dose over an hourly threshold 6 nmol m−2s−1) and AOT40 (accumulated hourly O3concentrations over a threshold of 40 ppb) performed similarly. The critical levels based on POD6and AOT40 for 5% reduction in maize yield were 1.17 mmol m−2PLA and 8.70 ppm h, respectively. In comparison with other important crops, the ranking of sensitivity of maize strongly differed depending on the O3metric used, AOT40 or POD6. The newly proposed response functions are relevant for O3risk assessment for this crop in Asia.