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- Title
基于双作物系数法估算不同水分条件下 温室番茄蒸发蒸腾量.
- Authors
龚雪文; 刘浩; 孙景生; 马筱建; 王万宁; 崔永生
- Abstract
An experiment was conducted to investigate soil evaporation (E), crop transpiration (T), evapotranspiration (ET) and the ratio of evaporation to evapotranspiration (E/ET) of drip-irrigated tomato, which was planted in a typical solar greenhouse in the North China, under different water conditions [ irrigation amount was determined based on accumulated pan evaporation (Ep) of 20 cm pan evaporation, and two treatments were designed with full irrigation (0.9Ep) and deficit irrigation (0.5Ep) ] at different growth stages in 2015 and 2016 at Xinxiang Comprehensive Experimental Station, Chinese Academy of Agricultural Sciences. Effects of deficit irrigation on crop coefficient (Kv) and variation of water stress coefficient (Ks) throughout the growing season were also discussed. E, T and ET of tomato were calculated with a dual crop coefficient approach, and compared with the measured data. Results indicated that E in the full irrigation was 21.5% and 20.4% higher than that in the deficit irrigation in 2015 and 2016, respectively, accounting for 24.0% and 25.0% of ET in the whole growing season. The maximum E/ET was measured in the initial stage of tomato, while the minimum obtained in the middle stage. The Kv the lull irrigation was 0.45, 0.89, 1.06 and 0.93 in the initial, development, middle, and late stage of tomato, and 0.45, 0.89, 0.87 and 0.41 the deficit irrigation. The Kr the deficit irrigation was 0.98, 0.93, 0.78 and 0.39 in the initial , development, middle, and late stage, respectively. The dual crop coefficient method could accurately estimate ET ol greenhouse tomato under different water conditions in 2015 and 2016 seasons with the mean absolute error (MAE) ol 0.36-0.48 mm • d-1, root mean square error (RMSE) ol 0.44-0.65 mm • d-1. The method also estimated E and T accurately with MAE ol 0.15-0.19 and 0.26-0.56 mm • d-1, and with RMSE of 0.20-0.24 and 0.33-0.72 mm • d-1, respectively.
- Publication
Yingyong Shengtai Xuebao, 2017, Vol 28, Issue 4, p1255
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.201704.009