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

Artikel i vetenskaplig tidskrift
Författare Zhaozhong Feng
Haoye Tang
Johan Uddling
Håkan Pleijel
Kazuhiko Kobayashi
Jianguo Zhu
Hiroki Oue
Wenshan Guo
Publicerad i Environmental Pollution
Volym 164
Sidor 16-23
ISSN 0269-7491
Publiceringsår 2012
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 16-23
Språk en
Länkar dx.doi.org/10.1016/j.envpol.2012.01...
Ämnesord Ozone flux; Flux–response relationship; Subtropical regions; Winter wheat
Ämneskategorier Miljökemi, Terrestrisk ekologi

Sammanfattning

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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