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土壤水分变化对冬小麦蒸腾速率的影响 被引量:5

Effects of Soil Moisture on Transpiration Rate of Winter Wheat
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摘要 研究了不同土壤水分条件下小麦叶片蒸腾速率的变化特征,结果表明,(1)在土壤水分充足的条件下,蒸腾速率较土壤水分匮乏时偏高近1倍,表明土壤相对湿度的大小直接影响小麦蒸腾速率。(2)土壤相对湿度的大小影响蒸腾速率峰值的出现时间,土壤相对湿度越小,蒸腾峰值出现的越晚,土壤相对湿度越大,蒸腾峰值出现的越早。分析发现,无论土壤相对湿度高或低,蒸腾速率在16:00均出现较前后偏低的现象。(3)在土壤相对湿度62%左右,小麦蒸腾速率与外界环境条件之间的关系呈现与其他土壤相对湿度下不同的变化特征。(4)从蒸腾速率的多因子模拟结果看出,在不同土壤相对湿度下,影响蒸腾速率的主要因子不同,土壤相对湿度<62%时模拟效果较好,土壤相对湿度≥62%时效果较差。 The changes of transpiration rate in wheat leaves were studied under different soil moisture treatments.The results were as follows:(1) The transpiration rate was about 100% higher in sufficient soil water conditions than in deficient ones;(2) The maximum value of transpiration rate varied with the changes of soil moisture.The peak value would be postponed along with the decrease of soil moisture;(3) An abnormal changing tendency of transpiration rate was found when the relative soil moisture was 62%;(4) The maximum and secondary transpiration rate appeared when the relative soil moisture was 82% and 46%,respectively;(5) The main factors affecting the transpiration rate were different under different soil moisture.The simulation result was better under 62% soil moisture,but became worse above 62%.
出处 《河南农业科学》 CSCD 北大核心 2010年第7期10-14,共5页 Journal of Henan Agricultural Sciences
基金 国家"十一五"科技支撑计划项目(2006BAD04B01)
关键词 小麦 土壤水分 蒸腾速率 Wheat Soil moisture Transpiration rate
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