宁夏灌区春小麦生理因子对田间微气象因子的响应

Physiology Factors of Spring Wheat in Response to Field Microclimate Factors in the Irrigation Area in Ninxia

在晴天、强光照的天气条件下,宁夏灌区春小麦的光合速率日变化呈现双峰曲线,两个峰值分别出现在上午9时和下午16时,下午的峰值略高于上午,中午出现明显的光合“午休”现象。光合有效辐射、气温、水汽压和田间二氧化碳浓度与光合速率、蒸腾速率及气孔导度等生理因子关系密切,是主要的影响因子。

A series of physiological characteristics of photosynthesis and microclimate factors are measured in the spring wheat field in the irrigated area of Ninxia. In sunny days with strong light ,the daily change pattern of photosynthetic rate could be expressed as a double - peak cure, in which one appeared at 9：00 in the morning was slightly lower than the other at 16：00 in the afternoon . At the same time the phenomena of photosynthesis ＂noon break＂ appeared at noon. photosynthesis effective radiation , temperature , steam pigeonhole and field carbon dioxide level were closely correlated with photosynthetic rate transpiration rate, and air vent lead degree ,etc. They were impact factors.