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干热风影响有多大
Jing Ji Ri Bao·2025-05-16 08:31

Core Viewpoint - The article discusses the impact of dry hot wind on winter wheat production in northern China, particularly during the critical growth period, highlighting the increasing frequency of such weather events due to climate change [1][2]. Group 1: Weather Forecast and Conditions - The Central Meteorological Observatory predicts light to severe dry hot wind weather in regions including Henan, Shaanxi, and Shanxi from May 16 to 19, with temperatures exceeding 35°C, and local highs reaching above 37°C [2]. - Since May 12, temperatures in the central and western Huanghuai region, southern North China, and Shaanxi have been significantly above normal, with daily maximum temperatures above 32°C [1]. Group 2: Impact on Winter Wheat - Dry hot wind is characterized by a sudden rise in temperature, low humidity, and wind, which can severely affect winter wheat during critical growth stages, leading to loss of water balance and reduced photosynthesis [1]. - The area of winter wheat affected by dry hot wind in Henan is estimated at 21.6%, while in Shaanxi, it is 19.8% [2]. - Without preventive measures, the weight of a thousand grains of wheat in affected areas could decrease by approximately 2.2% to 4.4% due to the combined effects of dry hot wind and soil moisture deficiency [2]. Group 3: Recommendations for Mitigation - Experts recommend optimizing foliar fertilizer and growth regulator formulations, and employing measures such as spraying foliar fertilizers to enhance photosynthetic capacity and transpiration resistance [2]. - For areas with poor soil moisture and micro-spray irrigation systems, it is advised to spray water before the arrival of dry hot wind to increase air humidity and reduce canopy temperature [2].