关键词: 轮作, 资源利用效率, 作物, 等价产量, 相关分析, 灰色关联度分析, 华北平原南部

Abstract: In order to take full advantage of natural resources(such as radiation,effective accumulated temperature,rainfall and soil) in the southern part of the North China Plain,we implemented some years of rotation patterns, including maize-wheat →maize-wheat →maize-wheat (T₁), soybean-wheat →soybeanwheat→maize-wheat(T₂),peanut-wheat→peanut-wheat→maize-wheat(T₃),sweet potato-wheat→sweet potato-wheat→maize-wheat(T₄) from June 2016 to June 2019.On the basis of economic value,different crop yields were converted by equivalent substitution method,and the utilization efficiencies of radiation,effective accumulated temperature,rainfall,and soil and crop equivalent yield(E_GY) of these modes during the trial period were analyzed by the methods of correlation analysis and grey correlation analysis.The results showed that,radiation use efficiency (RUE), accumulated temperature productive efficiency(PE_GDD) and water use efficiency(WUE) of T₃ were all the highest among these four modes,which were respectively up to 0.78%,5.37 kg/(ha·℃ ) 28.05 kg/mm.And T1 was next to T₃,with 0.61% of RUE,4.82 kg/(ha·℃) of PE_GDD and 25.28 kg/mm of WUE.Then correlation analysis of E_GY and these four natural resources demonstrated that there was a highly significant positive correlation between E_GY and PE_GDD or WUE,and a significant positive correlation between E_GY and land use efficiency(LUE).Furthermore,after grey correlation analysis with E_GY as the parent series and natural resource utilization efficiencies as the sub-series,we could see that these four resource utilization efficiencies were in sequence as PE_GDD>WUE>LUE>RUE.In summary,the yield(E_GY) was more impacted by PEGDD and WUE,and these natural resources utilization efficiencies in T₃ and T₁ modes were much more than others.

Key words: Rotation, Natural resources utilization efficiency, Crop, Equivalent yield, Correlation analysis, Grey correlation analysis, Southern part of the North China Plain