苗期短时高温条件下草莓干物质积累模型的修订

以草莓品种“红颜”为试验材料,分别于2018年和2019年对温室草莓苗期进行不同高温（日最高温/日最低温分别为32/22℃、35/25℃、38/28℃和41/31℃）和不同胁迫天数（2d、5d、8d和11d）处理,以28/18℃为对照（CK）,处理结束后将草莓移植到Venlo型玻璃温室进行正常栽培试验。以2018年数据定量分析高温和胁迫天数对温室草莓叶面积指数的影响,构建以生理发育时间为尺度的苗期高温对温室草莓叶面积指数影响模型,并结合已有的光合作用生产模型,构建光合驱动的草莓干物质生产的机理模型。以2019年试验数据对模型进行拟合验证。结果显示,构建的高温影响模型对温室草莓叶面积指数、最大光合速率和干物质生产的模拟值与实测值之间的决定系数（R²）分别为0.98、0.83 和0.91,均方根误差(RMSE)分别为0.04、1.50μmol·m⁻²·s⁻¹和1.38g·m^–2,相对误差（RE）分别为6.43%、13.17%和11.49%,说明所建模型较好地模拟了苗期高温对温室草莓叶面积变化和干物质生产的影响,可为温室草莓的高温环境管理和调控提供理论依据。

Modification of Strawberry Dry Matter Accumulation Model under Short-Term High Temperature Conditions at Seedling Stage

High temperature is one of the common agricultural meteorological disasters, affecting the growth and development of crops. In order to study the effect of high temperature at the seedling stage on the leaf area index and dry matter production of strawberry in the facility, the strawberry variety Benihoppe was used as the experimental material.Different dynamic high temperatures (32/22℃, 35/25℃, 38/28℃ and 41/41℃; maximum daily temperature/minimum daily temperature) and different stress days (2d, 5d, 8d and 11d) were performed on the strawberry seedlings in greenhouses in 2018 and 2019, with 28/18℃ as a control. The seedlings were then transplanted to a Venlo glass greenhouse for normal cultivation experiment. The data of 2018 were used to quantitatively analyze the effects of high temperature and stress days on the leaf area index, maximum photosynthetic rate and dry matter production of strawberry seedlings. Models of strawberry leaf area index, maximum photosynthetic rate and dry matter production were then constructed based on the physiological development time. The models were finally verified with the experimental data of 2019. The results showed that the R2 between the simulated and measured values of strawberry leaf area index, maximum photosynthesis rate, and dry matter production model was 0.98, 0.83, and 0.91, respectively, the root mean square errors(RMSE) were 0.04, 1.50μmol·m⁻²·s⁻¹ and 1.38g·m^–2, and the relative errors(RE) were 6.43%, 13.17% and 11.49%, respectively. The established model was able to simulate the effects of extreme high temperature at seedling stage on strawberry leaf area index and dry matter production in greenhouses. The research results would provide a theoretical basis for the management and regulation of the high-temperature environment of strawberries in the greenhouse.