Abstract:

With the continuous impact of climate change, the frequency of compound hot and dry events is increasing, which impacts global food production. Wheat, as a major food crop, is crucial for ensuring global food security and economic development. This review summarizes the temporal and spatial patterns of compound hot and dry events in major wheat-producing regions worldwide, assesses their impacts on wheat yield, and clarifies the mechanisms and research methods associated with extreme hot and dry conditions. The results indicate that the frequency and intensity of compound hot and dry events in the major wheat-producing regions of the world have increased during the period from 1960 to 2020. Compound hot and dry events have become a serious threat to wheat yields, and are expected to increase and intensify further in the future. The interaction between land-atmosphere systems and crop physiological stress further complicates the impacts of these events on wheat. Future research should focus on developing compound hot and dry indicators with physiological relevance for crops, employing statistical and crop growth models to explore the response mechanisms to compound hot and dry events, and integrating different dimensions, methods, and models to gain a deeper understanding of the impacts of compound hot and dry events. This will enhance adaptation strategies and risk assessments for such events, providing a scientific basis for understanding the impact of compound hot and dry conditions on wheat yield and offering guidance for the sustainable development of agricultural production.

Key words: Compound hot and dry event, Wheat yield, Climate change, Crop physiological response, Risk assessment