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Nitrogen application and intercropping change microbial community diversity and physicochemical characteristics in mulberry and alfalfa rhizosphere soil

查看全文 作　　者：Xiuli [1,2]Zhang;Zhiyuan [2]Teng;Huihui [3]Zhang;Dunjiang [4]Cai;Jingyun [4]Zhang;Fanjuan [1,2]Meng;Guangyu [1,2]Sun 高影响力作者 机构地区：[1]Key Laboratory of Saline-Alkali Vegetation Ecology Restoration(Northeast Forestry University),Ministry of Education,Harbin 150040,People’s Republic of China;[2]College of Life Science,Northeast Forestry University,Harbin 150040,People’s Republic of China;[3]College of Resource&Environment,Northeast Agricultural University,Harbin 150030,People’s Republic of China;[4]Institute of Crop Development,Heilongjiang Academy of Land Reclamation and Agricultural Sciences,Jiamusi,Heilongjiang,People’s Republic of China高影响力机构 出　　处：《Journal of Forestry Research》索引2021年第32卷第5期,共13页高影响力期刊 基　　金：the Heilongjiang Province Science Foundation for Youths(Grant No.QC2016018);the National Natural Science Foundation of China(Grant No.31600508);the Fundamental Research Funds for the Central University(2572017CA21);the Application Technology Research and Development Projects of Heilongjiang Province(Grant No.WB13B104);the Science and Technology Project of Heilongjiang Farms&Land Reclamation Administration(Grant No.HNK135-01-056)。 摘　　要：Intercropping of mulberry(Morus alba L.)and alfalfa(Medicago sativa L.)is a new forestry-grass compound model in China,which can provide high forage yields with high protein.Nitrogen application is one of the important factors determining the production and quality of this system.To elucidate the advantages of intercropping and nitrogen application,we analyzed the changes of physicochemical properties,enzyme activities,and microbial communities in the rhizosphere soil.We used principal components analysis(PCA)and redundancy discriminators analysis to clarify the relationships among treatments and between treatments and environmental factors,respectively.The results showed that nitrogen application significantly increased pH value,available nitrogen content,soil water content(SWC),and urea(URE)activity in rhizosphere soil of monoculture mulberry.In contrast,intercropping and intercropping+N significantly decreased pH and SWC in mulberry treatments.Nitrogen,intercropping and intercropping+N sharply reduced soil organic matter content and SWC in alfalfa treatments.Nitrogen,intercropping,and intercropping+N increased the values of McIntosh diversity(U),Simpson diversity(D),and Shannon-Weaver diversity(H’)in mulberry treatments.However,PC A scatter plots showed clustering of monoculture mulberry with nitrogen(MNE)and intercropping mulberry without nitrogen(M0).Intercropping reduced both H’and D but nitrogen application showed no effect on diversity of microbial communities in alfalfa.There were obvious differences in using the six types of carbon sources between mulberry and alfalfa treatments.Nitrogen and intercropping increased the numbers of sole carbon substrate in mulberry treatments where the relative use rate exceeded 4%.While the numbers declined in alfalfa with nitrogen and intercropping.RDA indicated that URE was positive when intercropping mulberry was treated with nitrogen,but was negative in monoculture alfalfa treated with nitrogen.Soil pH and SWC were positive with mulberry treatments but were negative with alfalfa treatments.Intercropping with alfalfa benefited mulberry in the absence of nitrogen application.Intercropping with alfalfa and nitrogen application could improve the microbial community function and diversity in rhizosphere soil of mulberry.The microbial community in rhizosphere soil of mulberry and alfalfa is strategically complementary in terms of using carbon sources. 关 键 词：Mulberry intercropped with alfalfa Nitrogen application Principal components analysis Redundancy discriminators analysis Rhizosphere soil
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