The investigation is a comparative study of heat stress on cherry tomato cultivated in different substrate systems (soil, peat moss, peat/perlite (1/2), perlite and a recirculation system) during summer time. The study was undertaken in a greenhouse during July, August and September 2002. The cherry tomatoes were transplanted in three different rooms (1, 2, 3) with different temperature regimes: 25/20℃, 35/25℃, and >35/>25℃ day/night temperatures respectively. The interaction between environmental factors and gas consistence was studied. There was a negative linear relationship between temperature and RH (R2: 0.894～0.972), and also between temperature and CO2 consistence in all the rooms (R2: 0.668～0.786). The growth rate was assessed, which shows the stem elongation was specifically related to the growing media. The effect of heat stress on plant water status was evaluated using the leaf water potential and leaf temperature. The analysis of variance shows that the growing media and heat stress significantly affect leaf water potential either at predawn or at midday. This result allowed to determine effective growth stages of the heat stress precisely and to guide us to choose the effective growing media suitable during summer.%该文旨在比较研究不同栽培基质(土壤、泥炭、泥炭/珍珠岩(1/2)、珍珠岩和营养液循环系统)中生长的樱桃番茄在夏季受热应激时的反应.试验于2002年7、8、9月进行,番茄分别移植到3个温室中,温度设置为:25/20℃,35/25℃,>35/>25℃,分别在番茄不同生长阶段进行.测试分析了温室内环境因子的变化和气体交互作用:温室内温度与湿度(R2:0.894～0.972)、温度与CO2浓度(R2:0.668～0.786)之间呈线性关系.测定了番茄的生长率,表明茎伸展与栽培基质密切相关.用叶水势来反映受热应激下番茄的水分状况,表明方差分析显示无论是黎明前还是正午,栽培基质和热应激对叶水势的变化有重要的作用.实验结果可正确确定热胁迫影响的生育时期,并为选择夏季番茄生产的适宜栽培基质提供依据.
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