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| DOI：10.13522/j.cnki.ggps.20190223 |
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| Effects of Water Regulation on Photosynthetic Characteristics and Yield of Kiwifruit Leaves under Different Micro-irrigation Methods |
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GAN Yukang1, SHI Haoran1, CUI Ningbo2, 3*, KANG Jiahui1
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1. School of Energy and Power Engineering, Xihua University, Chengdu 630039, China;2. State Key Laboratory of Hydraulics and Mountain River Development and Protection, Sichuan University, Chengdu 610065, China;3. Key Laboratory of Water-saving Agriculture in Southern Hilly Region, Chengdu 610066, China
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| Abstract: |
| 【Objective】The purpose of this study is to investigate the different ways of micro-irrigation under the influence of moisture regulation of kiwi fruit leaf photosynthetic characteristics and yield.【Method】 With “jade” kiwi fruit as the research material, using small pipe flow (X), micro sprinkler irrigation (P)and drip irrigation (D) three irrigation methods in kiwi 85% implementation of irrigation water in the whole stages of mild water deficit (LD), 70% of moderate water deficit irrigation water (MD1), 55% of irrigation water on the degree of water deficit (MD2) and 40% of severe water deficit irrigation water (SD), and set up the 100% of irrigation water control (CK), the changes of intercellular CO2 concentration (Ci), net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), carboxylation rate (CE), instantaneous water use efficiency (WUEi), yield and water use efficiency (WUEET) of kiwifruit leaves under different water deficit were studied. 【Result】Compared with CK, the average daily WUEi and CE of d-md1 improved by 8.5% and 2.7%, respectively. The average daily Pn and CE of P-DM1 increased by 10.7% and 10.4%, respectively, compared with CK. The average daily Ci, Pn and CE of X-MD1 increased by 10.9%, 12.2% and 11.4%, respectively, compared with CK. WUEET of D, P and X3 treatments all improved to different degrees compared with CK, but the yield of D, P and X decreased with the increase of water deficit, while there was no significant difference among drip irrigation treatments. Compared with CK, the yield of D-MD1, P-MD1 and X-MD1 increased by 1.4%, 1.6% and 2.3%, respectively. The yield of severely deficient water treatment was significantly lower than that of other water treatments, and there was no significant difference among other treatments.【Conclusion】MD1 can save irrigation water and increase WUEET without reducing the yield. There is no significant difference between severe and moderate water deficit in WUEET, and the yield of X-MD1 is higher than that of other treatments. Therefore, X-MD1 is a more suitable irrigation water deficit model for kiwifruit of “jade”. |
| Key words: irrigation mode; water deficit treatment; kiwi fruit. photosynthetic characteristics; physiological indexes |
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