A meta ‐analysis of the effects of global warming on rice and wheat yields in a rice–wheat rotation system

The yield response to warming differed for rice and wheat in the rice-wheat rotation system. Overall, warming significantly increased wheat yield (by 4.8%) but significantly reduced rice yield (by 14.8%). For rice, yield responses to warming varied with the temperature increase, variety and nitrogen rate. For wheat, however, yield responses to warming varied with the warming regime, ambient temperature, temperature increases and CO2 concentrations. AbstractThe effects of global warming on crop production have received great attention in recent years. However, inconsistent results have been obtained with regard to major crops such as rice and wheat in rice –wheat rotation systems of China. Therefore, we undertook a comprehensive meta-analysis of literature data. The yield response to warming differed for rice and wheat in the rice–wheat rotation system. Overall, warming significantly increased wheat yield (by 4.8%) but significantly reduced rice y ield (by 14.8%). A number of factors were responsible for these observations. For example, rice yield responses varied with the temperature increase, variety and nitrogen (N) rate. Of these, N was the most important variable influencing yield responses to warming. The yield loss for rice was lower a t temperature increases of 0.40–1.40°C and at a high N rate than that at temperature increases of 1.60–2.49°C and at a low N rate, respectively. The yield loss ofindica rice was lower than that ofjaponica rice. For wheat, howeve...
Source: Food and Energy Security - Category: Food Science Authors: Tags: ORIGINAL RESEARCH Source Type: research