A stomatal ozone flux-response relationship to assess ozone-induced yield loss of winter wheat in subtropical China

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• 作者：Zhaozhong Feng^a ; ^b ; ¹ ; ^{fzz@rcees.ac.cn} ; ^{zhzhfeng201@hotmail.com} ; Haoye Tang^b ; ^c ; ¹ ; Johan Uddling^a ; Hå ; kan Pleijel^a ; Kazuhiko Kobayashi^b ; Jianguo Zhu^c ; Hiroki Oue^d ; Wenshan Guo^e
• 关键词：Ozone flux ; Flux&ndash ; response relationship ; Subtropical regions ; Winter wheat
• 刊名：Environmental Pollution
• 出版年：2012
• 期刊代码：28_02697491
• 类别：env
• 出版时间：May, 2012
• 卷：164
• 期：Complete
• 页码：16-23
• 文件大小：549 K

摘要

Stomatal ozone flux and flux-response relationships were derived for winter wheat (Triticum aestivum L.) grown under fully open-air ozone fumigation. A stomatal conductance (g_sto) model developed for wheat in Europe was re-parameterized. Compared to European model parameterizations, the main changes were that the VPD and radiation response functions were made less and more restrictive, respectively, and that the temperature function was omitted. The re-parameterized g_sto model performed well with an r² value of 0.76. The slope and intercept of the regression between observed and predicted g_sto were not significantly different from 1 to 0, respectively. An ozone uptake threshold of 12聽nmol聽m^鈭?聽s^鈭? was judged most reasonable for the wheat flux-response relationship in subtropical China. Judging from both flux- and concentration-based relationships, the cultivars investigated seem to be more sensitive to ozone than European cultivars. The new flux-response relationship can be applied to ozone risk assessment in subtropical regions.