| Characteristics and its influencing factors of sap flow of apple trees during growth period in the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2023.04.28 |
| Key Words: apple tree sap flow impact factors growth period Loess Plateau |
| Author Name | Affiliation | | CAO Quan | State Key Laboratory of Herbage Improvement and Grassland Agro\|Ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu 730020, China；Qinghai University of Animal Science and Veterinary Medicine, Qinghai Academy of Animal and Veterinary Sciences, Key Laboratory of Adaptive Management of Alpine Grassland of Qinghai Province, Xining,Qinghai 810016, China | | WANG Zikui | State Key Laboratory of Herbage Improvement and Grassland Agro\|Ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu 730020, China | | LAI Xingfa | State Key Laboratory of Herbage Improvement and Grassland Agro\|Ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu 730020, China | | SHEN Yuying | State Key Laboratory of Herbage Improvement and Grassland Agro\|Ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu 730020, China |
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| Abstract: |
| In order to explore the characteristics of the sap flow velocity of an apple tree and the relationships between the sap flow velocity and its influencing factors in the semiarid area of the Loess Plateau, the thermal dissipation probe (TDP) was used to continuously measure the sap flow velocity of ‘Qinguan’ apple trees during the growth period in 2018.And simultaneously the influencing factors such as soil moisture, leaf area index of the apple tree (LAI), air temperature (Ta), air humidity (RH), net radiation (Rn), wind speed (WS), and the vapor pressure deficit (VPD) were calculated. The results showed that the average sap flow velocity during the germination and flower stage, fruit formation stage, fruit expansion stage, and fruit ripening stage was 0.85, 1.34, 1.53, and 0.82 mm·d-1, respectively, which was higher in the fruit expansion stage. Meanwhile, the sap flow velocity showed significant diurnal fluctuation, and the sap flow at night accounted for 11.54%~19.22% of the total sap flow in the different growth periods. The soil water consumption of the apple tree measured by the thermal dissipation probe was about 264.14 mm, and the water consumption at night was 35.60 mm. During the whole growth period, the daily sap flow velocity of the apple tree was significantly and positively correlated with Rn, Ta, VPD, and LAI of the apple tree, negatively correlated with WS and RH. The VPD was the key factor affecting the sap flow rate of apple trees in the germination and flower stage, fruit formation stage and fruit ripening stage of apple trees, while the Rn was the key factor affecting the sap flow rate of apple trees in the fruit expansion stage. There was no significant correlation between sap flow velocity and soil water content in 0~20 cm soil layer, but significantly positive correlations were found in 20~160 cm soil layers. |
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