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| DOI：10.13522/j.cnki.ggps.2021250 |
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| Change in Intra-annual Sap Flow in Ziziphus Jujube in Arid Oasis under Micro-sprinkler Irrigation |
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ZHANG Yang, MA Yingjie
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Xinjiang Agricultural University College of Water Conservancy and Civil Engineering, Urumqi 830052, China
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| Abstract: |
| 【Objective】Sap flow in stems is an approximation of transpiration. It changes with the environment and can be used to help irrigation management. The purpose of this paper is to investigate the intra-annual change in sap flow in the stems of jujube grown in an arid oasis in Xinjiang province, China.【Method】The jujube was irrigated by micro sprinkler irrigation; the sap flow was measured continuously using a needle-type stem flow meter for one year, from which we analyzed the change in water consumption of the jujube during its active growth and dormant periods.【Result】①Solar radiation affected the sap flow most and their correlation in the four active growth periods was RD1=0.924, RD2=0.939, RD3=0.943 and RD4=0.915, respectively. In winter when the crop stopped growing, air humidity affected the sap flow more and their correlation coefficient in the five growth periods was RC1=0.699, RC2=0.923, RC3=0.841, RC4=0.918 and RC5=0.618, respectively. ②During the active growing and dormant periods, the durations in which the sap flow was detectable using the meter was 14 h and 9 h, respectively. ③During the active growth seasons, the sap flow peaked from 12:00 to 15:30 pm, while during dormancy it maximized from 03:00 am to 06:00 am in the first two seasons and from 07:00 am to 10:00am in the last two seasons. ④The water consumption during the active growth seasons was ranked in the order of D3>D4>D2>D1, while in dormancy the rank was C1> C5>C3>C2>C4. 【Conclusion】The annual water consumption of the jujube was approximately 3 994.03 L, in which the consumption during the dormancy, which lasted for 183 days, was 777.30 L, accounting for 19.46% of the total water consumption of the tree. |
| Key words: sap flow; active growth period; dormancy period; water consumption; jujube |
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