Plant Soil Environ., 2014, 60(6):249-254 | DOI: 10.17221/878/2013-PSE

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

D. Liu1, S. Fang1, Y. Tian1, S.X. Chang2
1 Collegeof Forest Resources and Environment, Nanjing Forestry University, Nanjing, P.R. China
2 Department of Renewable Resources, University of Alberta, Edmonton, Canada

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

Published: June 30, 2014  Show citation

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Liu D, Fang S, Tian Y, Chang SX. Nitrogen transformations in the rhizosphere of different tree types in a seasonally flooded soil. Plant Soil Environ. 2014;60(6):249-254. doi: 10.17221/878/2013-PSE.
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