| Cite this article: | 郑顺生,崔宁博,赵璐,等.滴灌水分亏缺对猕猴桃生育前期光合特性的影响[J].灌溉排水学报,0,():-. |
| ZHENG Shunsheng,CUI Ningbo,ZHAO Lu,et al.滴灌水分亏缺对猕猴桃生育前期光合特性的影响[J].灌溉排水学报,0,():-. |
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| Effect of Water Deficit on Photosynthetic Characteristics of Kiwifruit under Drip Irrigation |
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ZHENG Shunsheng1, CUI Ningbo1, ZHAO Lu1, ZHANG Yixuan1, GONG Daozhi2, HU Xiaotao3, FENG Yu1
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1.State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu;2.State Engineering Laboratory for Efficient Water Use and Disaster Loss Reduction of Crops,Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agriculture Science;3.Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas,Ministry of Education,Northwest A F University,Yangling
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| Abstract: |
| 【Objective】We aimed to investigate the regulating effect of photosynthetic characteristics to deficit drip irrigation during the early growth period of kiwifruit, and provide a theoretical basis for water-saving and high-yield planting of kiwifruit in seasonal arid areas in southern Southern China.【Method】One control treatment (CK) and four water deficit levels (LD, MD2, MD1 and SD, 85%, 75%, 65% and 55% of full irrigation, respectively) with eight treatments were established at bud burst to leafing stage (I) and flowering to fruit set stage (II) in ‘Jinyan’ kiwifruit to analyze the effect of water deficit on the kiwifruit’s photosynthetic characteristics.【Result】Deficit irrigation reduced net photosynthesis rate (Pn), transpiration rate (Tr), stomatal conductance (gs) of kiwifruit significantly and the reduction increased with the increasing water deficit, while Pn had lower reduction than Tr and gs. Compared to CK, Pn of I- MD1 and II-MD2 reduced 16.3%、, 6.5%, respectively, instantaneous water use efficiency (WUEi) and intrinsic water use efficiency (WUEn) on leaf level increased 7.7%、, 15.6% and 8.1%、, 18.2% (P<0.05), respectively. Rehydration significantly increased Pn in kiwifruit leaves, and Pn of I-LD treatment increased 4.2% to 5.94 μmol/(m2·s) after rehydration compared to CK (P<0.05), appearing overcompensation effect. There was a quadratic relationship between Tr and gs versus vapor pressure difference (Δe). Tr increased significantly with Δe when the vapor pressure difference (Δe) was less than 25 × 102 Pa, and Δe significantly reduced gs when Δe was higher than 17×102 Pa.【Conclusion】I-LD treatment can increase the Pn of kiwifruit by 4.2% under the condition of saving 15% irrigation water in bud burst to leafing stage, II-MD2 can save 25% irrigation water in flowering to fruit set stage and increase the WUEi、, WUEn of kiwifruit by 8.1%、, 18.2%, respectively, which is recommended as the appropriate deficit drip irrigation model during the early growth period of kiwifruit in seasonal arid areas in southern Southern China. |
| Key words: drip irrigation; water deficit; kiwifruit; photosynthetic characteristic; water use efficiency |
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