水氮耦合处理对林下鸭茅草产量与品质及土壤特性的影响

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中图分类号：S543.3 文献标识码：A 文章编号：1007-0435（2025）05-1602-10

Abstract：Inorder to explore the effects of diferent water and nitrogen coupling treatments on the yield，nutri ent quality and soil physicochemical properties of Orchard grass（Dactylis glomerata） under the forest，the experiment was conducted in two kinds of canopy density （ C1=0.3 and C2=0.6 ） in the shallow mountainous area of Beijing. The split plot design was adopted，the main plot was treated with water， namely 150m3⋅hm-2 （204 （ ∇⋅W1） ， （ W2 ）and 450m3⋅hm-2 （ W3） . The secondary plot was treated with nitrogen fertilizer， namely ， 30kg⋅hm-2 （ F2） ， 60kg⋅hm-2 （ ⋅F3） ， 90kg⋅hm-2 （ F4） and 120kg⋅hm-2 （ F5） . The results showed that under the coupled treatment of 450m3⋅hm-2 irrigation and 90kg⋅hm-2 nitrogen application （W3F4） ，the annual fresh grass and hay yield of D . glomerata under O.3 and O.6 canopy density were the highest，and among them，the annual dry grass yield was 50.55% and 112.44% higher than that of W1F1 （ P< 0.05），respectively. The crude protein content and relative feeding value（RFV）of the first and second cut dry grass under W3F4 treatment were relatively high ，with RFV values ranging from 88.17 to 121.47. Moreover compared with W1F1 ，the average contents of total phosphorus and total potassium of 0⋅20cm soil layer under W3F4 treatment were higher .Insummary，the W3F4 coupling treatment could improve the yield and nutritional quality of D ：glomerata under the forest，and had a positive effect on improving the soil physicochemical properties of 0-20cm soil layer.

Key Words：Forest-grascompound;Dactylis glomerata;Water-nitrogen coupling;Grass yield;Nutritional qual ity;Soil characteristics

林草复合经营已成为欧洲、北美、新西兰和澳大利亚等林草资源合理配置、林草畜有机结合的主要产业经济形式，发挥着重要的经济、生态和自然资源有效管理的功能[1-3]，林草复合系统可有效改善土壤理化性状，提高土壤有机质[4-5]，在减轻土壤侵蚀、保持水土和改善林地生态环境方面发挥着重要作用，已逐步形成了农林牧业高质量发展和生态环境建设的新型研发领域[6-7]，成为解决农林牧复合系统中“生产、生态和生活”三生功能的重要抓手，得到了世界各地学者的广泛关注[8-12]。（剩余12026字）