The Impact of Arachis hypogaea Intercropping on Soil Carbon and Nitrogen Composition in the Artificial Forest of Shihe Sandy Land
[Objective]The objective of this study is to investigate the effects of intercropping peanuts on the carbon and nitrogen components of three common artificial forest soils in the Shihe Sandy Land,pro-viding a scientific basis for the plant selection and configuration in the ecological restoration project of the Shihe Sandy Land in southeastern Henan Province.[Method]These stand types included Koelreuteria paniculata,Acer mono,Populus tomentosa,Koelreuteria paniculata+Arachis hypogaea,Acer mono+Ara-chis hypogaea,and Populus tomentosa+Arachis hypogaea.The effects of intercropping Arachis hypogaea on soil carbon and nitrogen fractions in different forest stands and across different soil layers were ana-lyzed by collecting soil samples from 0～20 cm,20～40 cm,and 40～60 cm layers.[Result]① with in-creasing soil depth in all six stands,and significant differences were observed between the contents of carbon and nitrogen components in different stands within the same soil layer(P＜0.05).In the horizontal direction,the contents of soil carbon and nitrogen components were generally higher in intercropping modes than in monocultures.② In the shallow soils,the soil carbon and nitrogen fractions were highest in the Koelreuteria paniculata+Arachis hypogaea intercropping and lowest in Acer mono monoculture.③Correlation analysis revealed a highly significant positive correlation between total nitrogen(TN)and soil organic carbon(SOC)(P＜0.01);active organic carbon components such as particulate organic carbon(POC)and easily oxidizable carbon(EOC)were significantly positively correlated with SOC(P＜0.05);microbial biomass nitrogen(MBN)and TN,as well as other nitrogen components,showed extremely sig-nificant(P＜0.01)or significant positive correlations(P＜0.05).[Conclusion]The soil carbon and nitro-gen component contents under intercropping were higher than those under monoculture,with Koelreuteria paniculata+Arachis hypogaea showing the best effect in improving carbon and nitrogen content in the Shihe Sandy Land.
artificial forestspeanutinterplantsoilcarbon and nitrogen components
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