| Soil water temporal and spatial distribution and water-saving efficiency of straight tube root irrigation |
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| DOI：10.7606/j.issn.1000-7601.2017.04.15 |
| Key Words: straight tube root irrigation soil water temporal and spatial distribution water-saving efficiency water use efficiency |
| Author Name | Affiliation | | MA Zhen-yong | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 73000, China
University of Chinese Academy of Sciences, Beijing 100049, China | | DU Hu-lin | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 73000, China | | LIU Rong-guo | Ningxia Shapotou National Nature Reserve Administration, Zhongwei, Ningxia 755700, China | | YAN Zi-zhu | Gansu Desert Control Research Institute, Lanzhou, Gansu 730070, China | | LIU Li-gang | Ningxia Shapotou National Nature Reserve Administration, Zhongwei, Ningxia 755700, China |
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| Abstract: |
| In order to identify soil water temporal and spatial distribution and water-saving efficiency under straight tube root irrigation, root irrigation experiment in the Jujube ecological and economic forest of downstream part of Tarim river was carried out. The results showed that: (1) In straight root irrigation process, the distribution of soil moisture was at soil layer from 0 to 100 cm; with the increase in irrigation time, the soil water content of soil layer from 0 to 20 cm was fluctuating, that of soil layer(80～100 cm) stable, and that of the rest soil was on the rise of S type; (2) The maximum value of average soil water content of one-meter deep soil layer and the time at which the value was reached were 44.62% and 7.5 h, in jujube growth stage, 43.26% and 12.5 h in flowering stage, 46.3% and 15 h in young fruit period; (3) In the process of root irrigation, the variation coefficient of soil water content at each soil layer was ranked in the descending order, 80 cm＞20 cm＞40 cm＞60 cm＞100 cm. After irrigation, there was significant difference in the average soil water content at 80 cm, 100 cm layer and that at rest layers. There was no significant difference in the average soil water content between the soil layer of 20 cm, 40 cm and 60 cm. The spatial heterogeneity of soil water content in 80 cm soil layer was the highest; (4) 20 days after the three experiments, the regression rate of the average soil water content in 0～100 cm soil layer was 0.21%·d-1, 0.19%·d-1 and 0.17%·d-1 respectively. With regard to soil volumetric water content, the regression rate of the 60 cm and 100 cm soil layer remained stable, that of 40 cm soil layer faded before it increased, that of 20 cm soil layer faded rapidly in the first ten days, and that of 80 cm soil layer faded rapidly in the latter ten days. (5) The water-saving efficiency of straight tube root irrigation was 27.78% higher than surface drip irrigation. The water use efficiency of straight tube root irrigation was 8.12% and 52.46% higher than respectively than surface drip irrigation and flood irrigation. |
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