| Effect of vertical line source irrigation method on grape growth and water use efficiency in extremely arid regions |
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| DOI：10.7606/j.issn.1000-7601.2012.03.11 |
| Key Words: vertical line source irrigation method soil moisture physiologieal indexes yield water use efficiency exlremely arid region |
| Author Name | Affiliation | | WANG Yongjie | Institute of Water Resouce, Xi,an Unhersity of Technology, Xi’an, Shaanxi 710048, China | | WANG Quanjiu | Institute of Water Resouce, Xi,an Unhersity of Technology, Xi’an, Shaanxi 710048, China
State Key Laboraiory of Soil Erosion anvd Dry Land Farming on the Loess Plateau, Yangling, Shaanxi 712100, China | | SU Lijun | Institute of Water Resouce, Xi,an Unhersity of Technology, Xi’an, Shaanxi 710048, China | | NAN Qingwei | Institute of Water Resouce, Xi,an Unhersity of Technology, Xi’an, Shaanxi 710048, China |
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| Abstract: |
| The effects of irrigation methods on the manner and scope of soil moisture may influenee the crop root wa-ter uptake, thereby affecting crop growth and water use efficiency. With conventional drip irrigation method as the control treatment, a field experiment was carried out to study the chatacteristics of grape growth and water use effieiency under vertical line source irrigation method. The results show that during the key stages of grape growth, under pre and post ir-rigation, the avetage moisture content of the soil root layer can be up to 75.1% and 82.8% of field capacity respective-ly,while under conventional drip irrigation the field water-holding ratio is 60% and 72%;and the net photosynthetic rate, transpiration rate, stomatal conductance under vertical line source irrigation are higher than those under convention-al drip irrigation, the net photosynthetic rate experiences both stomatal limitation and non-stomatal
limitation,the non-stomatal limitation caused by water stress under vertical line source irrigation occurs later than under conventional drip ir-rigation, and the performance is not obvious; Vertical line source irrigation method in terms of aboveground
biomass growth is slightly better than convenlional drip irrigation method, but does not show significant differences between
the two; Vertical line source drip irrigation method increases the yield by 1.2% compared to the eonventional way; And it can also increase the water use effieiency in the leaf level by 68.8%. |
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