关键词: 玉米, 草谷比, Meta分析, 差异性, 影响因素

Abstract:

Determining the straw−to−grain ratio provides a scientific basis for improving the accuracy of straw resource estimation and assessing the carbon sequestration potential of crops. This study reviewed 117 experimental articles related to the maize straw−to−grain ratio and applied Meta−analysis to integrate and quantitatively analyze the straw−to−grain ratio of maize under different regions, years, field management practices and environmental stresses. The results showed that: (1) there was a significant difference in the maize straw−to−grain ratio across China, with the overall trend being higher in the north and lower in the south, with an average value of 1.17. (2) From 2001 to 2022, the maize straw−to−grain ratio decreased by 11.81%, with significant interannual variation. (3) The effect of planting density and nitrogen application rate on the straw−to−grain ratio of maize followed a trend of first decreasing and then increasing. The optimal effect, with the lowest straw−to−grain ratio, was observed at a planting density of 6×10⁴–7×10⁴ plants·ha⁻¹ and nitrogen fertilizer application of 100−200kg·ha⁻¹. Biodegradable plastic film coverage and ploughing with straw return both significantly reduced the maize straw−to−grain ratio, with reductions of 11.29% and 10.48%, respectively. (4) Environmental stress during the flowering period had the greatest impact on the maize straw−to−grain ratio. Combined heat and drought stress had a more significant effect than individual stresses, increasing the straw−to−grain ratio by 75.00%. In conclusion, significant differences in the maize straw−to−grain ratio exist under different production environments. This study identifies a more reasonable maize straw−to−grain ratio under different regions, years, field management practices, and environmental stresses, providing data support for the estimation of maize straw resources and carbon sequestration potential. This is of great significance for improving the utilization efficiency of straw resources and assessing the carbon sink potential of agricultural crops.

Key words: Maize, Straw?to?grain ratio, Meta analysis, Differences, Influencing factors