水氮耦合處理對林下鴨茅草產(chǎn)量與品質(zhì)及土壤特性的影響

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中圖分類號：S543.3 文獻(xiàn)標(biāo)識碼：A 文章編號：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

林草復(fù)合經(jīng)營已成為歐洲、北美、新西蘭和澳大利亞等林草資源合理配置、林草畜有機(jī)結(jié)合的主要產(chǎn)業(yè)經(jīng)濟(jì)形式，發(fā)揮著重要的經(jīng)濟(jì)、生態(tài)和自然資源有效管理的功能[1-3]，林草復(fù)合系統(tǒng)可有效改善土壤理化性狀，提高土壤有機(jī)質(zhì)[4-5]，在減輕土壤侵蝕、保持水土和改善林地生態(tài)環(huán)境方面發(fā)揮著重要作用，已逐步形成了農(nóng)林牧業(yè)高質(zhì)量發(fā)展和生態(tài)環(huán)境建設(shè)的新型研發(fā)領(lǐng)域[6-7]，成為解決農(nóng)林牧復(fù)合系統(tǒng)中“生產(chǎn)、生態(tài)和生活”三生功能的重要抓手，得到了世界各地學(xué)者的廣泛關(guān)注[8-12]。（剩余12026字）