Seasonal variation in carbon isotope composition and WUEi correspond with weather factors for five cultivars of Chinese jujube in Xinjiang
Abstract：Using stable carbon isotope technique, the foliar δ^13C was studied, and Pn, Tr, air temperature and humidity and other meteorological factors of five leading Chinese jujube cuhivars in Xinjiang were de- termined. The results showed that： （ 1 ） the range of foliar δ^13C was between -25,559‰ to -27.861‰, the average was -26.463‰; （2）foliar δ^13C had significant seasonal changes ,that was in spring （26.088‰）〉 in summer （26.395‰） 〉 in autumn （26.904‰）, and the largest value of foliar δ^13C （-25.559） was found in cultivar Junzao in spring and the smallest value was -27.861‰ found in Dongzao in autumn, the difference was 2.302‰; （3） the air relative humidity was a major factor causing the seasonal changes of foliar δ^13C value; （4） the order of WUEsl of the five cultivars was Dongzao 〈 Lizao 〈 Zanhuangdazao 〈 Huizao 〈 Junzao, but the order of WUEi of the five cultivars was Dongzao 〈 Junzao 〈 Zanhuangdazao 〈 Lizao 〈 Huizao, which indicating that Dongzao had the worst ability to adapt to drought in Southern region of Xinjiang.
Keywords：Chinese jujubeFoliarStable carbon isotope valueWater use efficiencyXinjiang
Publication Date：2012-01-01