光温耦合对生菜生长和品质的影响
毕业论文关键词：生菜；LED；光温耦合；生长；品质
Effects of Light and Temperature Interactions on Growth and Quality of Lettuce
Abstract：Light and temperature not only have an important role in regulating plants growth and quality, but also related to energy consumption of plants production in artificial environment. In this study, growth and quality of lettuce(Lactuca sativa L.) were studied under different light intensities and temperatures of LEDs combination of red and blue light. The results showed that temperatures did not affect stem diameter under weaker light level while rising temperatures significantly increased it under higher light level. Under the same temperature, weaker light intensity highly raised stem diameter. Higher temperature promoted leaf growth and weaker light intensity boosted leaf area, stem diameter and clearance rate of DPPH under lower temperature. In higher light level, warmer temperature got higher yield, leaf length and antioxidant ability. Weak light intensities and low temperatures were major limiting factors of biomass accumulation. Higher temperature could significantly increase the biomass accumulation in higher light intensity conditions. The soluble protein of lettuce was positively correlated with light intensity, while photosynthetic pigment and nitrate content was negatively correlated with it. And different external conditions had different effects on vitamin C. Based on the above analysis, it was concluded that interaction of higher temperature and stronger light could be proportional to meeting the plants’ needs, and higher temperatures would , to some extent, make up for shortage of lights in our study.
Key words: lettuce; LED;interaction of light and temperature; growth; quality
目 录
摘要 3
关键词 3
Abstract. 3
Key words 3
引言 3
1材料与方法 4
1.1 材料与处理 4
1.2 测定指标与方法 4
1.3 数据处理 4
2 结果与分析 4
2.1 光温耦合对生菜形态建成和生物量积累的影响 5
2.2 光温耦合对生菜叶片光合色素含量的影响 5
2.3 光温耦合对生菜品质的影响 6
2.4 光温耦合对DPPH清除率和硝酸盐含量的影响 6
3 讨论 7
致谢 8
参考文献 8
表1 光温耦合对生菜形态建成的影响 5
表2 光温耦合对生菜生物量积累的影响 5
表3 光温耦合对生菜光合色素含量的影响 6