豆禾混播牧草的种间竞争对土壤磷吸收效率的影响OA

To evaluate the effects of intercropping arrangements on phosphorus use efficiency and interspecific competition in legume-grass mixtures,same-row intercropping(T)and alternate-row intercropping(Y)was conducted by the pot experiment.The study investigated the relationships among phosphorus use efficiency(PUE),interspecific competition,and the overyielding effect in triticale-hairy vetch and triticale-common vetch systems.The results showed that for the triticale-hairy vetch mixture,yield and overyielding were higher in the same-row arrangement,whereas the triticale-common vetch mixture was the opposite.The relative yield(RY)was higher in the alternate-row arrangement for both systems.Metrics including encroachment rate(A),competition rate(CR),and relative crowding rate(K)indicated that triticale was the competitively dominant species.Phosphorus use efficiency varied in the triticale-hairy vetch system,and it was higher for triticale under alternate-row but higher for hairy vetch under same-row intercropping;in the triticale-common vetch system,both species showed higher PUE in the alternate-row arrangement.Threshold analysis revealed that highly competitive ability coupled with high PUE synergistically induced the overyielding effect under the alternate-row arrangement.In conclusion,for establishing annual forages in the cool region of Zhaosu,the alternate-row intercropping of triticale and common vetch is recommended.