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Scientia Silvae Sinicae ›› 2018, Vol. 54 ›› Issue (10): 31-38.doi: 10.11707/j.1001-7488.20181004

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Water Use Source of Apple Trees with Full Productive Agein Loess Hilly Region

Wang Shaofei1,2, Zhao Xining1,3,4, Gao Xiaodong1,3,4, Huo Gaopeng1,2, Pan Yanhui5   

  1. 1. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University Yangling 712100;
    2. College of Water Resources and Architectural Engineering, Northwest A & F University Yangling 712100;
    3. Institute of Soil and Water Conservation, Northwest A & F University Yangling 712100;
    4. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources Yangling 712100;
    5. Key Laboratory of Western China's Environmental Systems of Ministry of Education, Lanzhou University Lanzhou 730000
  • Received:2017-09-07 Revised:2018-09-01 Online:2018-10-25 Published:2018-11-03

Abstract: [Objective] [Objective] The water use strategy of apple trees indifferent planting years in the loess hilly region wasdiscussed in this study, in order to provide a useful reference for water management and sustainable development of apple orchards.[Method] In this study, 10-, 15-and 22-year-old apple trees were selected as the object and the natural and artificial deuterium isotope tracer techniques and MixSIR model were used to analyze the contribution ratio of different moisture sources to apple trees growth to investigate the seasonal variation of its moisture source.[Result] The results indicated that the source of moisture utilization varied greatly among the three apple trees of different ages.The main source of moisture of the 10-year-old apple trees changed from the middle and deep layers of flowering and fruit-bearing stage(88.9%)to the shallow layeratthe coloring and ripening stage (57.9%). The main source of moisture for the 15-year-old apple trees came from the middle layer during the blossoming and bearing fruits period and fruit expanding stage; but in the coloring and ripening period, the apple tree mainly absorbed the shallow layer soil moisture.During the whole growth period, the 22-year-old apple trees mainly used shallow and middle soil moisture (74.34%, 86.07% and 87.77% respectively),and the ratio of deep soil moisture utilization was decreased gradually.The significant increase in deuterium isotopes in xylem samples of apple trees showed that apple trees could alleviate water stress by absorbing deeper soil moisture.[Conclusion] There was an obviously difference in water use source of three stand ages apple trees. The water source was shallower gradually and more conservative with stand age increasing. Reasonable water management measures should be adopted to effectively decrease nonproductive water consumption and extravagant water consumption to realize sustainable and healthy development of orchards on the basis of water source seasonal variations for different stand age apple trees.

Key words: the Loess plateau, apple, full productive age, water source

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