| 引用本文: | 杨逗逗,张黛静,王艳杰,等.微喷对冬小麦冠层微环境日变化及叶片水势的影响[J].灌溉排水学报,2017,36(6):. |
| YANG Doudou,ZHANG Daijing,WANG Yanjie,et al.微喷对冬小麦冠层微环境日变化及叶片水势的影响[J].灌溉排水学报,2017,36(6):. |
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| 摘要: |
| 采用裂区试验，以矮抗58为试验材料，在前期滴灌控水处理下，探究了不同的微喷处理对冬小麦冠层微环境、叶片水势和产量的影响。结果表明，在冬小麦灌浆后期微喷10 mm能显著降低冠层温度、二氧化碳摩尔分数，提高相对湿度、旗叶叶片水势。MW2处理（滴灌底墒水、拔节水和开花水，并在灌浆后期微喷10 mm）的产量、千粒质量最高，分别为6 952.39 kg/hm2、45.44 g，均显著高于其他处理（P<0.05）。相关分析显示，产量与冠层温度呈极显著负相关、与旗叶叶片水势极显著正相关、与冠层相对湿度显著正相关。可见，滴灌底墒水、拔节水和开花水，并在灌浆后期微喷10 mm，能够改善冬小麦冠层微环境，缓解空气高温对小麦的胁迫，显著提高千粒质量，增加产量。 |
| 关键词: 冬小麦； 冠层微环境； 叶片水势； 产量 |
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| Impact of Micro-sprinkler Irrigation on Diurnal Variation of Microenvironment of Canopy of Winter Wheat and Their Leaf Water Potential |
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YANG Doudou, ZHANG Daijing, WANG Yanjie, LIU Xueqing, LIU Anqi, CHEN Qianqing, LI Chunxi
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College of Life Science, Henan Normal University, Xinxiang 453000, China
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| Abstract: |
| This paper investigated the impact of micro-sprinkler irrigation on diurnal change in microenvironment of winter wheat canopy, their leaf water potential and yield using split-plot experiment. We used the cultivar Aikang58 as the model plant. The results showed that irrigating 10 mm of water at late grain-filling stage could significantly reduce the temperature and carbon dioxide concentration of the canopy, whereas increasing the relative humidity and leaf water potential of the canopy. The treatment of drip-irrigating at sowing, jointing and flowering stages, together with a further 10 mm of irrigation at late filling stage, gave the highest yield (6 952.39 kg/hm2) and 1000-grain weight (45.44 g), which were significantly higher than those in other treatments. Analysis showed that the yield was negatively related to canopy temperature (P<0.01), while positively related to leaf water potential (P<0.01) and relative humidity of the canopy (P<0.05). Therefore, drip irrigation at sowing, jointing and anthesis stages with further 10 mm of irrigation at late grain-filling stage could optimize the canopy microenvironment and alleviate thermal stress, significantly increasing yield and grain weight as a result. |
| Key words: winter wheat; canopy microenvironment; leaf water potential; yield |
