Rural Revitalization and De?velopment Center of Yixin Township,Duer Bert Mongolian National Minority Autonomous County,Daqing, 166200 ,China 在期刊界中查找 在百度中查找 在本站中查找
【Objective】To explore the best restoration mode suitable for moderately degraded grassland and provide technical support for the protection and restoration of degraded grassland in Songnen Plain.【Method】 The study examined two types of mixed sowing,involving Medicago sativa and Leymus chinensis(legume∶grass interrow patterns of 2∶2(B1)nand 1∶2(B2)),along with seven levels of nitrogen fertilization of 0,50,100,150,200,250,300 kg/ hm2 . The aim was to identify the optimal restoration model for moderately degraded grassland in Songnen Plain by analyzing soil nutrient content,forage quality and yield.【Result】 Fertilizer levels significantly affected community species richness (P<0. 01). Additionally,fertilizer levels,mixed sowing proportions,and their interaction significantly affected soil organic matter,Shannon‐Wiener diversity index,crude protein content and forage yield (P< 0. 05). Significant positive correlations were observed between soil total nitrogen,forage crude protein content and nitrogen application (P<0. 01). The variation in soil total nitrogen corresponded to the nitrogen application rate under both mixed sowing proportions. Forage crude protein content with 300 kg/hm2 N reached 20. 22%,significantly higher than other treatments (P<0. 05).【Conclusion】 Nitrogen application rate of 200~250 kg/hm2 yielded the best results in the autumn of 2021 and the spring of 2022. The Margalef richness index and Shannon‐Wiener diversity index of legumegrass in the 1∶2 configuration were higher than those in the 2∶2 configuration,with 150 kg/hm2 N identified as optimal.