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以黄瓜为试材,在生长季连续观测土壤相对含水量50%~60%(SW1)、75%~90%(SW2)处理下日光温室黄瓜植株叶片湿度及环境因子,以揭示日光温室作物叶片湿度变化特征及影响因子。结果表明:不同生育期黄瓜叶片湿度差异显著,表现为生长中期>生长初期>生长末期,SW2>SW1;不同生育期SW1和SW2处理下的黄瓜叶片湿度变化趋势一致,在生长初中期叶片湿度为夜间(00:00—08:00)增加,白天(08:00—20:00)骤降,傍晚(20:00—00:00)回升的趋势,在生长末期处于一个较低水平状态。通过主成分回归分析得出,第1主成分F1光照、温度、饱和水汽压和第2主成分F2土壤水热条件的累计贡献率大于65%,综合F1和F2得出不同生育期黄瓜植株叶片湿度主要受温室内光照、温度、湿度及土壤水热条件影响。
The cucumber was used as test material to continuously observe the leaf moisture and environmental factors of cucumber under solar greenhouse with SW1 and SW2 under the relative water content of 50% -60% (SW1) Characteristics of humidity and influencing factors. The results showed that there were significant differences in the leaf moisture at different growth stages of cucumber, which showed that the growth of cucumber leaves at different growth stages was the same as that of SW2> SW1. The changes of leaf moisture were the same at SW1 and SW2. The nighttime (00: 00-08: 00) increase, the daytime (08: 00-20: 00) plunge, and the evening (20: 00-00: 00) rebound trend, at the end of the growth period at a lower level. The principal component regression analysis showed that the cumulative contribution of the first principal component F1 to light, temperature, saturated vapor pressure and the second main component F2 soil hydrothermal condition was more than 65%. Combining F1 and F2, the leaf yield of cucumber plants at different growth stages Humidity mainly by the greenhouse light, temperature, humidity and soil hydrothermal conditions.