中国生态农业学报2017，Vol.25Issue(7)：1042-1051,10.DOI:10.13930/j.cnki.cjea.161141
高温对小白菜品质的影响及模拟研究
Effect of high-temperature on the quality of pakchoi and its simulation
摘要
Abstract
To explore the effects of high-temperature stress on yield and quality of greenhouse pakchoi, a study was con-ducted from October 2015 to May 2016. In the study, we set three gradients of daytime/nighttime temperatures of 32℃/ 22℃, 35℃/25℃, 38℃/28℃, with 25℃/18℃ as the control, and the duration of each treatment was 3 d, 6 d, 9 d and 12 d, respectively. The results showed that: (1) the dry weight, fresh weight, leaf fresh weight, leaf length, leaf width, petiole width, SPAD and per unit area yield decreased with increased high-temperature stress. Furthermore, the decline aggravated with in-creasing treatment duration. (2) Petiole length and rolled leaf rate increased gradually with increased temperature and duration. High-temperature stress increased the content of crude fiber. Under short-term high-temperature stress condition, the contents of soluble sugar, soluble protein and vitamin C did not change obviously, but gradually decreased due to increased temperature degree and stress duration. (3) A mathematical model of rolled leaf rate and per unit area yield of pakchoi was established and vali-dated by independent experimental data. The root mean square error and relative error of model of rolled leaf rate with minimum temperature and treatment time were small — respectively 7.59% and 0.1894. The model for yield per unit area with maximum temperature and treatment time were smaller — also respectively 274.02 g·m-2 and 0.073%. Our study suggests that high-temperature stress downgraded pakchoi appearance quality and internal quality with increasing stress time and degree. Besides, we defined high-temperature stress index and determined high-temperature stress degree for greenhouse pakchoi. The results provided scientific basis for the determination of meteorological indicators and for disaster prevention.关键词
高温胁迫/小白菜/品质/生育期/模拟模型Key words
High-temperature stress/Pakchoi/Quality/Growth period/Simulation model分类
农业科技引用本文复制引用
薛思嘉,杨再强,李军..高温对小白菜品质的影响及模拟研究[J].中国生态农业学报,2017,25(7):1042-1051,10.基金项目
国家科技支撑计划项目(2014BAD10B07)资助 This study was supported by the National Key Technologies R&D Program of China (2014BAD10B07). （2014BAD10B07）
