接种AMF替代磷肥促进退化草地黄花苜蓿的补播建植  

AMF Inoculation instead of Phosphorus Fertilizer Promotes the Establishment of Reseeded Medicago falcate in Degraded Grasslands

作　　者：李春玥 马飞 杨高文[1] 刘楠[1] 张英俊[1] LI Chun-yue;MA Fei;YANG Gao-wen;LIU Nan;ZHANG Ying-jun(College of Grassland Science and Technology,China Agricultural University,Beijing 100193,China)

机构地区：[1]中国农业大学草业科学与技术学院,北京100193

出　　处：《草地学报》2022年第10期2541-2548,共8页Acta Agrestia Sinica

基　　金：内蒙古自治区科技成果转化专项资金项目(2020CG0124)资助。

摘　　要：退化草地土壤肥力和有益微生物的降低是补播植物建植的主要限制因子。为探究植物共生菌与施肥对补播豆科的退化草地群落结构和生产力的影响,本研究选取黄花苜蓿(Medicago falcate)、羊草(Leymus chinensis)和冷蒿(Artemisia frigida)进行盆栽试验。结果表明:(1)与不接种相比,接种丛枝菌根真菌(Arbuscular mycorrhizal fungi,AMF)使黄花苜蓿的地上生物量显著提高259.54%;不接种加施磷肥比不施肥下黄花苜蓿地上生物量显著提高465.93%,而双接种加施磷肥比不施肥下黄花苜蓿的地上生物量仅显著提高46.58%;(2)与不接种相比,接种AMF使羊草的地上生物量显著降低60.66%;不接种加施磷肥比不施肥时羊草地上生物量显著提高34.49%;(3)不接种加施磷肥比不施肥下冷蒿地上生物量显著提高149.32%;接种AMF时,冷蒿地上生物量在氮磷同施处理下较其它施肥处理平均显著提高129.39%。因此,在退化草地中补播黄花苜蓿时,为减少肥料用量及节约成本,可通过接种AMF替代施用磷肥。The reduction of soil fertility and/or beneficial soil microbes is a major limiting factor for establishment of reseeded plants in degraded grasslands.To uncover the effects of inoculation of plant symbiotic microbes and fertilization on plant biomass and community structure in reseeded grasslands,a pot experiment on Medicago falcate,Leymus chinensis and Artemisia frigida was carried out.The results are showed as followed.(1)In M.falcata,the aboveground biomass was increased by 259.54%with inoculation of arbuscular mycorrhizal fungi(AMF),compared with the control without inoculation;without AMF inoculation,phosphorus(P)fertilization increased the aboveground biomass by 465.93%;but with AMF and rhizobia inoculation,P fertilization increased the aboveground biomass by only 46.58%,compared to the control without P.(2)In L.chinensis,AMF decreased the aboveground biomass by 60.66%,while without AMF inoculation,P increased the aboveground biomass by 34.49%.(3)In A.frigida,with no inoculation,P fertilization increased the aboveground biomass by 149.32%,while with AMF inoculation,fertilization of both N and P increased the aboveground biomass by 129.39%,compared with the three other conditions of no fertilization,only N,or only P.In order to decrease the application of P fertilizers and cost saving,AMF inoculation could be an alternative way for the establishment of reseeded M.falcate in degraded grasslands.

关 键 词：丛枝菌根真菌 根瘤菌 施肥 补播 黄花苜蓿 羊草 冷蒿 

分 类 号：S812.6[农业科学—草业科学]