施肥和豆禾混播对松嫩平原退化草地修复的影响  

Effects of fertilization and mixed sowing on restoration of degraded grassland in Songnen Plain

作　　者：方玉凤 曹志伟 唐丽红 任秀彬 姜峰 蒋先翠 高野 FANG Yu-feng;CAO Zhi-wei;TANG Li-hong;REN Xiu-bin;JIANG Feng;JIANG Xian-cui;GAO Ye(Qiqihar Branch Heilongjiang Academy of Forestry Sciences,Qiqihar,161005;Rural Revitalization and Development Center of Yixin Township,Duer Bert Mongolian National Minority Autonomous County,Daqing,166200,China)

机构地区：[1]黑龙江省林业科学院齐齐哈尔分院,黑龙江齐齐哈尔161005 [2]杜尔伯特蒙古族自治县一心乡乡村振兴发展中心,黑龙江大庆166200

出　　处：《草原与草坪》2024年第2期192-199,共8页Grassland and Turf

基　　金：黑龙江省省属科研院所科研业务费项目(CZKYF2020C019)。

摘　　要：【目的】探索适合松嫩平原中度退化草地的最佳修复模式,为松嫩平原退化草地的保护修复提供技术支持。【方法】设置紫花苜蓿(Medicago sativa)与羊草(Leymus chinensis)2种混播比例,结合不同N施用量,分析土壤养分含量、牧草品质和产量之间的关系。【结果】施肥水平显著影响群落物种丰富度(P<0.01),施肥水平、混播比例及二者交互显著影响土壤有机质、Shannon⁃Wiener多样性指数、牧草粗蛋白含量及产量(P<0.05)。土壤全氮、牧草粗蛋白含量与施氮量存在极显著正相关性(P<0.01)。两种混播比例下,土壤全氮含量变化与N施用量一致;N施用量300 kg/hm2的牧草粗蛋白含量高达20.22%,与其他处理差异显著(P<0.05)。【结论】N施用量200~250 kg/hm2在试验当年秋季和第二年春季均获得最佳产量;豆禾1∶2混播的群落丰富度和多样性优于2∶2混播,其中N施用量150 kg/hm2表现最佳。【Objective】To explore the best restoration mode suitable for moderately degraded grassland and pro⁃vide 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 inter⁃row pat⁃terns 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 signifi⁃cantly 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 ni⁃trogen 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 in⁃dex of legume⁃grass in the 1∶2 configuration were higher than those in the 2∶2 configuration,with 150 kg/hm2 N iden⁃tified as optimal.

关 键 词：豆禾混播 土壤养分 牧草产量 粗蛋白 群落构成 

分 类 号：S54[农业科学—作物学]