数字农科院2.0

Relationship Between Stable Carbon Isotope Discrimination And Water Use Efficiency Under Deficit Drip Irrigation Of Kiwifruit In The Humid Areas Of South China

文献类型： 外文期刊

作者： Zheng, SS; Cui, NB; Gong, DZ; Wang, YS; Hu, XT; Feng, Y; Zhang, YX

作者机构：

关键词： Stable Carbon Isotope Discrimination; Deficit Drip Irrigation; Water Use Efficiency; Kiwifruit; Growth Stage

期刊名称： AGRICULTURAL WATER MANAGEMENT

ISSN： 0378-3774

年卷期： 2020 年 240 卷

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： In order to explore the application value of the stable carbon isotope discrimination method in improving water use efficiency (WUE) and productivity of kiwifruit under deficit drip irrigation, five water deficit levels (55 %, 65 %, 75 %, 85 % and 100 % of full irrigation) with thirteen treatments were established at three growth stages in field-grown kiwifruit. The leaf stable carbon isotope discrimination (Delta(L)) at different growth stages and fruit stable carbon isotope discrimination (Delta(F)) at fruit maturation stage of kiwifruit were determined; the changes of WUE at leaf and yield levels were analyzed, and the indicating effect of carbon isotope discrimination (Delta C-13) on the WUE of kiwifruit was also verified. The results showed that moderate water deficit improved the WUEi (photosynthesis rate/transpiration rate, P-n/T-r) and WUEn (photosynthesis rate/stomatal conductance, P-n/P-s) of kiwifruit at each growth stage. Compared with full irrigation (CK), the yield (Y) and WUFy (yield/crop evapotranspiration, Y/ET) of low water deficit treatment (LD) at fruit maturation stage increased by 14.75 % and 23.74 %, respectively. There were significant relationships between Delta(L) and Delta(F) versus WUE, C-i/C-a (the specific value of intercellular CO2 concentration and ambient atmosphere CO2 concentration), CE (carboxylation rate), ET (crop evapotranspiration) and Y under deficit drip irrigation, respectively. Delta(L) was negatively correlated with WUEn (coefficient of determination, R-2 = 0.4844, P < 0.01) over the whole growth period, whereas Delta(F) was positively correlated with Y (R-2 = 0.2805, P < 0.05) and ET (R-2 = 0.9267, P < 0.01), respectively. Overall, this study verifies that Delta(L) can be used as a useful evaluation index of WUEn, and Delta(F) is an important indicator of quantifying Y and ET of kiwifruit under deficit drip irrigation.

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