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대기-엽 수증기압차(VPD)에 의한 어수리와 눈개승마의 광합성 반응 비교
이경철,권영휴,이경민,한상균,Lee, K.C.,Kwon, Y.H.,Lee, K.M.,Han, S.K. 국립한국농수산대학교 교육개발센터 2016 현장농업연구지 = Journal of practical agricultural resear Vol.18 No.1
This study was conducted to investigate the effect of atmosphere-leaf vapor pressure deficit (VPD) in Heracleum moellendorffii and Aruncus dioicus var. kamtschaticus. The VPD was rapidly increased with increasing temperature and decreasing relative humidity. Taken as a whole, the stomatal transpiration reaction was slightly late with increasing of VPD. Maximum photosynthetic rate at high-VPD condition was 6.49 µmol CO<sub>2</sub>·m<sup>-2</sup>·s<sup>-1</sup> in Heracleum moellendorffii Hance, which was a little lower than 5.57 µmol CO<sub>2</sub>·m<sup>-2</sup>·s<sup>-1</sup> in Aruncus dioicus var. kamtschaticus, respectively. After 2 p.m, stomatal transpiration of Heracleum moellendorffii at the high VPD condition was rapidly decreased. The results indicated that physiological activities in Heracleum moellendorffii are more limited from high VPD conditions.