老芒麦与苜蓿间作对牧草产量及种间关系的影响OA

[Obejective]The purpose of this study aims to reveal the effects of different ratios of Medicago sativa+Elymus sibiricus intercropping on grass yield and interspecific relationships in the system.[Method]In this study,the Medicago sativa+Elymus sibiricus intercropping system established under different intercropping ratios(the legume to gramineae ratios were 2∶4,2∶5,2∶6,2∶7,and 2∶8)was used as the research object to analyze the for-age yield,interspecific relationships and intercropping advantages of the legume to gramineae intercropping grassland.[Results](1)The total forage yield under all intercropping treatments were significantly higher than Elymus sibiri-cus monoculture(P<0.05).The Elymus sibiricus yield and grass yield ratio under 2∶7 and 2∶8 intercropping treat-ments were significantly higher than those under the 2:5 intercropping treatment(P<0.05).The sustainable yield in-dex for the 2∶7 intercropping treatment increased significantly by 13.92%compared to the 2∶5 intercropping treat-ment(P<0.05),indicating better yield sustainability.(2)Compared to monocropping,except for the 2∶8 intercrop-ping treatment in 2022,the land equivalent ratio(LER)was greater than 1 in all cases,indicating an improvement in land use efficiency.The natural logarithmic response ratio(LNRR),component contribution rate(MCC),relative crowding coefficient(K),competitive ratio(CR),aggressivity(A)and actual yield loss(AYL)showed that alfalfa was more dominant than Elymus sibiricus in intercropping,but 2021(the third year of establishment)was the domi-nant position of Elymus sibiricus.(3)The intercropping advantages(IA)were all positive,and the economic benefits were higher than monoculture.IA with a mixed ratio of 2∶8 using intercropping method was significantly higher than other treatments for 3 consecutive years(2021-2023)(P<0.05).[Conclusion]The intercropping system of Medi-cago sativa+Elymus sibiricus has the advantage of intercropping,and has higher production performance at the ratio of legume to gramineae ratio 2∶8 and 2∶7,and the intercropping system is relatively stable.