Nitrogen transformations in the rhizosphere of different tree types in a seasonally flooded soil

D. Liu, S. Fang, Y. Tian and S.X. Chang
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D. Liu: Collegeof Forest Resources and Environment, Nanjing Forestry University, Nanjing, P.R. China
S. Fang: Collegeof Forest Resources and Environment, Nanjing Forestry University, Nanjing, P.R. China
Y. Tian: Collegeof Forest Resources and Environment, Nanjing Forestry University, Nanjing, P.R. China
S.X. Chang: Department of Renewable Resources, University of Alberta, Edmonton, Canada

Plant, Soil and Environment, 2014, vol. 60, issue 6, 249-254

Abstract: Plant roots strongly influence C and N availability in the rhizosphere via rhizodeposition and uptake of nutrients. An in situ rhizobox approach was used to compare rhizosphere effects of different tree species and clones on N cycling under seasonally flooded soil. We examined N mineralization and nitrification rates, inorganic N, and microbial biomass C (MBC) and N (MBN) in rhizosphere and bulk soils of three poplar clones, alder, and willow plantations in southeast China. Significant differences in soil pH, total N, soil organic C, MBC, MBN, and MBC/MBN were found between bulk and rhizosphere soils except alder. Compared to bulk soil, the net N mineralization and nitrification rates in rhizosphere soil across all tree species and clones increased by 124-228% and 108-216%, respectively. However, NO3--N was depleted in the rhizosphere soil mainly owing to the root uptake and rhizosphere microbial immobilization. The magnitude of rhizosphere effects on N transformations was considerably different among the tree species studied. Of the tested ones, alder had the greatest rhizosphere effect on N transformation, indicating different capacities of tree species to facilitate N turnover in the rhizosphere.

Keywords: nitrogen mineralization; rhizosphere effect; tree species; nitrogen cycling; rhizobox (search for similar items in EconPapers)
Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:60:y:2014:i:6:id:878-2013-pse

DOI: 10.17221/878/2013-PSE

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