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Evapotranspiration from citrus trees growing in sandy soil under drip irrigation with saline water

Science China Earth Sciences 2002年第Z1期45卷 41-46页

作者：杨胜利 Shin-ichi Takeuchi Tomohisa Yano Yoshinobu Kitamura Arid Land Research Center Tottori University 1390 Hamaska Tottori 680-0001 Japan Faculty of Engineering Kyushu Kyouritsu University Kitakyushu 807-8585 Japan Faculty of Agriculture Tottori University Tottori 680-8553 Japan

An experiment on evapotranspiration from citrus trees under irrigation with saline waterwas carried out for 4 months. Two lysimeters planted with a citrus tree in the green house wereused. One lysimeter was irrigated with saline water (NaCl and CaCl2 of 2000 mg/L equivalence,EC = 3.8 dS/m, SAR = 5.9) and the other was irrigated with freshwater using drip irrigation. Theapplied irrigation water was 1.2 times that of the evapotranspiration on the previous *** was calculated as the change in lysimeter weight recorded every 30 *** lysimeters were filled with soil with 95.8% sand. The results of the experiment were as follows.(i) The evapotranspiration from citrus tree was reduced after irrigation with saline water. Theevapotranspiration returns to normal after leaching. However it takes months to exhaust the saltfrom the tree. ( ii ) To estimate the impact of irrigation with saline water on the evapotranspirationfrom citrus trees, the reduction coefficient due to salt stress (Ks) was used in this *** under irrigation with saline water (ETs) can be calculated from evapotranspira-tion under irrigation with freshwater (ET) by the equation ETs = Ks× ET. Ks can be expressed as afunction of ECsw. (iii) The critical soil-water electrical conductivity (ECsw) is 9.5 dS/m, beyondwhich adverse effects on evapotranspiration begin to appear. If ECsw can be controlled at below9.5 dS/m, saline water can be safely used for irrigation.

关键词： lysimeter, drip irrigation, saline water, reduction coefficient due to salt stress, evapotranspiration.

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