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

Journal article
Authors Zhaozhong Feng
Haoye Tang
Johan Uddling
Håkan Pleijel
Kazuhiko Kobayashi
Jianguo Zhu
Hiroki Oue
Wenshan Guo
Published in Environmental Pollution
Volume 164
Pages 16-23
ISSN 0269-7491
Publication year 2012
Published at Department of Biological and Environmental Sciences
Pages 16-23
Language en
Links dx.doi.org/10.1016/j.envpol.2012.01...
Keywords Ozone flux; Flux–response relationship; Subtropical regions; Winter wheat
Subject categories Environmental chemistry, Terrestrial ecology

Abstract

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 (gsto) 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 gsto model performed well with an r2 value of 0.76. The slope and intercept of the regression between observed and predicted gsto were not significantly different from 1 to 0, respectively. An ozone uptake threshold of 12 nmol m−2 s−1 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.

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