氮磷配施调控白三叶入侵草地早熟禾草坪的竞争响应OA

Trifolium repens exhibits strong invasive capacity in gramineous turf,particularly due to its vigorous stolon spreading,which severely compromises turf uniformity,posing a significant challenge in the maintenance of urban green spaces and sports fields.To control the invasion of Trifolium repens into Poa pratensis turf,this study applied 20 different combined nitrogen(N)and phosphorus(P)fertilizer treatments.Growth morphology,competitive indices,and turf visual quality of both Poa pratensis and Trifolium repens were measured.Principal component analysis and membership function method were employed to identify the optimal N and P fertilizer levels for the establishment and maintenance of Poa pratensis turf in arid and semi-arid regions of northern China,aiming to effectively suppress Trifolium repens growth while enhancing the quality of Poa pratensis turf.The comprehensive evaluation indicated that the treatment of P application at 35 g/m² without N,combined application of P at 35 g/m² and N at 18 g/m²,and N application at 18 g/m² without P resulted in superior overall turf performance,demonstrating potential for promotion in the establishment and maintenance of Poa pratensis turf in these regions.