土地细碎化抑制粮食单产的机理及破解路径研究OA

Breaking the deadlock of land fragmentation is a key step to achieving large-scale grain production and implementing the 'storing grain in the land'strategy.Based on survey data from 729 grain-planting entities in Shandong Province,this study empirically analyzes the mechanism by which land fragmentation inhibits grain yield per unit area,using multiple linear regression,structural equation modeling,and a moderated mediation model.The results show that land fragmentation has a significant negative direct effect on grain yield per unit area(β=0.086,p<0.01)and also indirectly inhibits it by hindering the improvement of mechanization levels.Expanding farm size can weaken the inhibitory effect of land fragmentation on grain yield and mitigate the inhibitory path by which fragmentation affects grain yield through mechanization.Accordingly,the study proposes promoting compre-hensive land resource consolidation and strengthening the construction of high-standard farmland;enhancing agri-cultural machinery training to raise the level of mechanization;and supporting diverse forms of operation to encour-age the development of moderate-scale farming.