旱作豆—禾混播的草产量及其种间关系研究OACSTPCD

In order to investigate the yield and interspecific relationship of legume-grass mixtures under dry farming conditions,the random block design was used to study the yield and interspecific relationship of Astragalus laxmannii,Lotus corniculatus,Coronilla varia,Bromus inermis and Elymus dahuricus.The plant height,yield and interspecific competition of grass species were studied of nine mixed-sowing combinations and five single-seeding treatments.The results showed that the plant heights of A.laxmannii+L.corniculatus+B.inermis(ALB)were higher than those of the single sowing.The hay yield was significantly higher than that of the other treatments,Mixed sowing had a greater effect on the plant height of legumes and a less effect on the plant height of Gramineae,and did not increase the yield of all combinations.When the legume-grass ratio was 2∶1,Legume showed more intraspecific competition pressure than the interspecific competition pressure,that is,the legume herbage was inhibited by grasses.When the legume grass ratio was 1∶2,Gramineae showed more intraspecific competition pressure than the interspecific competition pressure,and grasses were inhibited by legume herbage.