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基于两个生长季的冬小麦田间试验资料,揭示了冠气温差与多因素的响应关系,分析了冠气温差对叶片光合速率、蒸腾速率的影响,确定了冠气温差、相对冠气温差与叶片光合速率、蒸腾速率的差异区间。结果表明:冬小麦冠气温差与饱和水汽压差显著负相关,叶片光合速率、蒸腾速率与冠气温差呈显著的二次抛物线关系,冠气温差、相对冠气温差对叶片光合速率、蒸腾速率的差异区间可作为反映冬小麦叶片水分高效利用的依据。不同水文年相对冠气温差差异区间较为一致,不同生育阶段(抽穗开花期、灌浆期、成熟期)范围分别是0.40~0.60,0.40~0.55和0.40~0.65。
Based on the field data of winter wheat in two growing seasons, the relationship between the temperature difference of canopy and multi-factors was revealed. The effects of the temperature difference between canopy temperature on photosynthetic rate and transpiration rate were analyzed. The effects of canopy temperature difference, Photosynthetic rate, transpiration rate of the different intervals. The results showed that there was a significant negative correlation between temperature difference of canopy air temperature and saturated water vapor pressure in winter wheat. There was a significant quadratic parabola relationship between leaf photosynthesis rate and transpiration rate and canopy temperature. The effects of canopy temperature and relative canopy temperature on photosynthetic rate and transpiration rate Difference interval can be used as a basis to reflect the efficient use of water in winter wheat leaves. The differences of relative air temperature difference between different hydrological years are consistent, and the range of different growth stages (heading and flowering, grain filling and maturity) is 0.40-0.60,0.40-0.55 and 0.40-0.65 respectively.