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Journal of Arid Land  2013, Vol. 5 Issue (2): 233-243    DOI: 10.1007/s40333-013-0155-1
Research Articles     
Effects of deficit irrigation on daily and seasonal variations of trunk sap flow and its growth in Calligonum arborescens
LiShan SHAN1, Yi LI1, RuiFeng ZHAO2, XiMing ZHANG3
1 Forestry Department, Gansu Agricultural University, Lanzhou 730070, China;
2 College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China;
3 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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Abstract  Water deficit in arid and semiarid regions affects whole-plant sap flow and leaf-level water relations. The objectives of this study were to clarify how sap flow of Calligonum arborescens responds to different drought stress conditions and to understand its acclimation mechanism to drought environments. A field experiment was conducted for C. arborescens during the growing season to evaluate the effects of deficit irrigation on the daily and seasonal variations of trunk sap flow in the shelterbelt along the Tarim Desert Highway, Xinjiang, China. Three different water regimes (2,380, 1,960 and 1,225 m3/hm2) were applied at different stages of plant growth. From 1 May to 30 October 2007, a heat-balance stem flow gauge was used to monitor the sap flow dynamics of C. arborescens under different water regimes. Atmospheric evaporation demand and soil moisture conditions for differentially irri-gated C. arborescens were also monitored. The result showed that sap flow exhibited a clear diurnal pattern regardless of treatments; the diurnal patterns of sap flow and vapour pressure deficit were very similar under different water regimes and growing seasons, while the slope of the linear regression of this correlation confirmed an increasing water regime. The sap flow decreased under reduced water regimes and there was nocturnal sap flow regardless of water regimes, which was mainly contributed to nocturnal transpiration and water recharge. The sap flow peaked before midnight and dropped afterwards with obviously higher values in summer than in other seasons. It is speculated that the water consumption of C. arborescens during the day can be supplemented through the sap flow at night, which increased with increasing irrigation amount. Net radiation was the most significant correlated factor that influenced sap flow velocity and transpiration under different water regimes (R2>0.719). Compared with the commonly practiced water regime, the growth of C. arborescens was significantly slower in the stress deficit irrigation, but not significantly different from that in the moderate deficit irrigation. The moderate deficit irrigation would not affect the stability of the shelterbelt and was a more efficient use of water resources compared with the current watering amount.

Key wordsagricultural water use efficiency      cultivated land area      planting structure      surface runoff variation      Aksu River Basin     
Received: 11 July 2012      Published: 01 June 2013

The Inter-national Science and Technology Cooperation Pro-gram of China (2012DFR30830), the National Natural Science Foundation of China (41261047), the Gansu Science and Technology Support Program (1204NKCA084) and the Project of Knowledge In-novation of the Chinese Academy of Sciences (KZCX3-SW-342)

Corresponding Authors: Yi LI     E-mail:
Cite this article:

LiShan SHAN, Yi LI, RuiFeng ZHAO, XiMing ZHANG. Effects of deficit irrigation on daily and seasonal variations of trunk sap flow and its growth in Calligonum arborescens. Journal of Arid Land, 2013, 5(2): 233-243.

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