基于CROPWAT模型的拉萨地区燕麦优化灌溉制度研究

针对西藏高海拔地区灌溉人工草地发展面临牧草灌溉基础理论研究薄弱的现实,以拉萨市为研究区,依托田间试验和CROPWAT模型模拟预测,对燕麦需水量、耗水量、优化灌溉制度等进行研究。结果表明,拉萨地区燕麦全生育期需水量为570 mm,不同水分条件下耗水量在464~570 mm之间,分蘖、拔节初期为燕麦灌水关键期。通过CROPWAT模型模拟,确定当地燕麦灌水2~4次较适宜。最优非充分灌溉制度的灌水时间为播种前、分蘖期和拔节初期,净灌水量分别为37、43、30 mm。

Research on optimal irrigation schedule of oats by CROPWAT in Lhasa of Tibet

This paper pointed at the reality of facing weak theoretical research on irrigation for artificial forage grass in high altitude region in Tibet, carried out the research on water requirements, water consumption and optimal irrigation schedule for oat crop, based on the field experiment, and simulation and prediction by the CROPWAT model, taken the Lhasa City as a typical research area. The results showed that: The crop water requirements in whole growth period for oat was 570 mm in the Lhasa Region. Under the different condition of water supply, the water consumption range was between 464 mm to 570 mm. The crucial irrigation time for oat was the tillering stage and early jointing stage. Through the simulation by the CROPWAT model, has determined 2 to 4 irrigation times was rather suitable, also the optimal non-full irrigation schedule was at pre-sowing, tillering stage and early jointing stage. The net irrigation quota was 37 mm, 43 mm and 30 mm, respectively. This research results has a certain of guidance significance for improving irrigation water use efficiency of oat in Lhasa Region and to realize water saving irrigation and high productivity.