| 摘要: |
| 【目的】探讨水分对甜瓜叶片光响应特性的影响机制，以期为甜瓜栽培中的科学用水提供依据。【方法】于2010 07-10，以甜瓜品种“一品天下208”为材料，采用盆栽试验，按照单株蒸腾蒸发量的60%(Ⅰ)，80%(Ⅱ)，100%(Ⅲ)和120%(Ⅳ)作为补充灌溉量进行水分处理，研究甜瓜叶片光响应特性及相关参数的变化。【结果】随着灌溉量的增加，甜瓜叶片的净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、胞间CO2浓度(Ci)、最大光合速率(Pmax)和表观量子效率(ε)均呈先增加后降低的变化趋势，其中以处理Ⅲ的最高，气孔限制值(Ls)和水分利用效率(WUE)呈先降低后升高趋势，其中以处理Ⅲ的最低。【结论】气孔限制是水分影响甜瓜叶片光合作用的主要因素。按单株蒸腾蒸发量的100%(Ⅲ)补充的灌溉量，是甜瓜适宜的灌溉量。 |
| 关键词: 水分 甜瓜 光响应特性 气孔限制 水分利用效率 |
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| 基金项目:国家“十二五”科技支撑计划项目（2011BAD12B03） |
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| Effect of water on characteristics of light response of muskmelon leaves |
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| Abstract: |
| 【Objective】 In order to provide basis for theoretical water management of muskmelon culture,the effect of water on characteristics of light response of muskmelon leaves was discussed.【Method】 During July to October,2010,with muskmelon “Yipintianxia 208” as the experimental material,and under different water supplementary irrigation treatments of 60%(Ⅰ),80%(Ⅱ),100%(Ⅲ) and 120%(Ⅳ) of evapotranspiration for plant,the change of light responsive characteristics and relative parameters was studied by using pot culture.【Result】 With the increase of irrigation amount,net photosynthetic rate (Pn),stomatal conductance (Gs),transpiration rate (Tr),intercelluar CO2 concentration (Ci),light saturated photosynthetic rate (Pmax) and apparent quantum efficiency (ε) of muskmelon leaves all rose first and then decreased,and reached the highest under the supplementary irrigation treatment of Ⅲ.While stomatal limitation value (Ls) and water use efficiency (WUE) decreased first and then rose,under the supplementary irrigation treatment of Ⅲ, they were the lowest.【Conclusion】 Stomatal limiting factor was the main factor influencing photosynthesis muskmelon leaves.Supplementary irrigation of 100%(Ⅲ) of evapotranspiration for plant was suitable for muskmelon. |
| Key words: water muskmelon characteristics of light response stomatal limitation water use efficiency |
