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• W2355561305 abstract "As a component in the belowground ecosystem,rhizosphere microecological system may affect global carbon cycling process.The recent studies suggest that rhizosphere processes may play an important role in mediating ecosystem function such as net primary production,decomposition,and C storage to climate change.However,the mechanisms by which roots affect rhizosphere processes are still poorly understood,and the responses on rhizosphere effects to exogenous warming and nitrogen addition are little known.To obtain a clear knowledge of rhizosphere responses of the different species to warming and nitrogen addition is very important to understand the mechanisms in belowground ecosystem to global climate change.Picea asperata and Abies faxoniana are two dominant species of subalpine coniferous forest in western Sichuan,China.A controlled experiment was carried out to investigate the responses on rhizosphere effect of P.asperata and A.faxoniana seedlings and the differences between two species to night-time warming(ambient temperature;infrared heater warming) and nitrogen fertilization(0;25g m-2 a-1 N).The responses on their rhizosphere effects to simulated global change play an important role to survey the interaction between plant-root and soil-microbe,which can provide insights into rhizosphere micro-ecological system,manage and restore the vegetation of subalpine coniferous forest.The results were shown as follows:(1) Contrast to the control,mean air temperature was 1.62 ℃ higher in the warming plot than the control plot,meanwhile soil temperature at 0 cm,5 cm,10 cm and 15 cm depths also increased by 1.97 ℃、2.89 ℃、3.1 ℃ and 2.37 ℃ respectively;In addition,warming and ambient air relative humidity are 79.24% and 87.99%.(2) Different responses(positive rhizosphere effects,negative rhizosphere effects or no rhizosphere effects) were found in soil properties for both species under warming and nitrogen fertilization.Warming generally resulted in increased by 42.28% and 31.02% on microbial biomass C(SMB-C) of rhizosphere and bulk soil for P.asperata respectively.While soil organic C of the bulk soil was significantly decreased by 7.03% by warming.In general,warming did not affect the rhizosphere effects of soil properties in both tree seedlings.However warming showed significantly negative rhizosphere effects on total N for P.asperata seedling,which significantly reduced the rhizosphere effects by 79.43%;Rhizosphere effects of A.faxoniana was significantly increased mainly due to the increased total N and microbial biomass N(SMB-N) in the rhizosphere.NO-3-N and NH+4-N of two tree seedlings were significantly increased by nitrogen fertilization and interaction between warming and nitrogen fertilization as well as microbial biomass N(SMB-N) of the bulk soil for P.asperata.Meanwhile,an remarkably negative effect on SMB-N was observed for P.asperata.In addition,interaction between warming and nitrogen fertilization showed significantly positive effects on NH+4-N for A.faxoniana.Different competitive and adaptive strategies between the two conifers may explain their different responses of rhizosphere effects to stimulated warming and nitrogen fertilization,which may be important to give insights into potential influences on belowground ecological processes and early regeneration dynamics for subalpine coniferous forest ecosystems in face to future climate change." @default.
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• W2355561305 date "2011-01-01" @default.
• W2355561305 modified "2023-09-27" @default.
• W2355561305 title "Responses on rhizosphere effect of two subalpine coniferous species to night-time warming and nitrogen fertilization in western Sichuan,China" @default.
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