间甲酚和供磷对小麦间作蚕豆生产力和组分竞争力的影响

通过盆栽试验研究了3个磷水平下化感物质间甲酚对小麦间作蚕豆生产力和级分竞争力的影响。结果表明,间作较单作具有显著增产作用,100mgP2O5土(P1)的施磷水平下复合群体的生物产量最高;施磷可显著降低间甲酚对小麦间作蚕豆生物产量和经济产量的化感效应,间作小麦经济产量受间甲酚的负效应低于单作。间作小麦经济系数(HI)在不施磷和施磷水平为P1时高于单作小麦,施磷量增大结果相反,间作蚕豆HI在施磷量为P1时高于单作;施磷可缓解间甲酚对小麦、蚕豆经济系数的化感作用,间作小麦经济系数受抑程度小于单作,施磷水平为P1时间作蚕豆HI受抑程度小于单作。施磷和间甲酚可增强小麦蚕豆复合群体中小麦相对于蚕豆的竞争力。

Effect of 3-Methyl-Phone and Phosphorous Application on Productivity and Components Competitive of Wheat Broad-bean Intercropping Systems

Pot experiment was carried out to research the effect of allelochemical 3methylphone on productivity and components competitive of spring wheat and broadbean in intercropping system at phosphorous application rates of 0(P_0), 100 mg P_2O_5/kg soil(P_1) and 200 mg P_2O_5/kg soil(P_2). The results shown that, intercropping could significantly enhance the bioyield of wheat and broadbean, and the yield of multiple system attached the highest at the phosphorous application rate of P_1. The negative allelopatic effect of 3methylphone on bioand ecoyield of the intercropping system was significantly decreased at the phosphorous application retes of P_1 and P_2, and the effect on ecoyield of intercropped wheat was weaker than on that of the sole wheat. At the phosphorous application retes of P_0 and P_1,the harvest index(HI) of intercropped wheat were significantly improved compared to the sole wheat, but as the phosphorous application rate was enhanced to P_2, the result reversed; phosphorous application rete at P_1 could improve the HI of intercropped broadbean compared to sole one. The negative effect of 3methylphone on HI of wheat and broadbean were weakened by phosphorous at the application rate of P_1 and P_2 ,and the allelopatic effect on HI of intercropped wheat were weaker than on that of the sole wheat in all treatments, but the effect on intercropped broadbean was weaker only at the phosphorous application rate of P_1 compared to sole broadbean. In wheat broadbean intercropping system, the competitive of wheat was increased by 3methylphone and phosphorous application.