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Forests 2015, 6(9), 2941-2958;

Soil Nitrogen Transformations and Availability in Upland Pine and Bottomland Alder Forests

Department of Environmental Science and Engineering, Ewha Womans University, Seoul 03760, Korea
River Basin Research Center, Gifu University, Gifu 501-1193, Japan
Department of Environmental Engineering, Konkuk University, Seoul 05029, Korea
Forest Practice Research Center, Korea Forest Research Institute, Pocheon 11186, Korea
Department of Environmental Science and Ecological Engineering, Graduate School, Korea University, Seoul 02841, Korea
Department of Biological and Environmental Science, Qatar University, Doha P.O. Box 2713, Qatar
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Heinz Rennenberg
Received: 28 June 2015 / Revised: 23 August 2015 / Accepted: 24 August 2015 / Published: 27 August 2015
(This article belongs to the Special Issue Nitrogen and Phosphorus Nutrition of Trees and Forests)
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Soil nitrogen (N) processes and inorganic N availability are closely coupled with ecosystem productivity and various ecological processes. Spatio-temporal variations and environmental effects on net N transformation rates and inorganic N concentrations in bulk soil and ion exchange resin were examined in an upland pine forest (UPF) and a bottomland alder forest (BAF), which were expected to have distinguishing N properties. The annual net N mineralization rate and nitrification rate (kg N·ha−1·year−1) were within the ranges of 66.05–84.01 and 56.26–77.61 in the UPF and −17.22–72.24 and 23.98–98.74 in the BAF, respectively. In the BAF, which were assumed as N-rich conditions, the net N mineralization rate was suppressed under NH4+ accumulated soils and was independent from soil temperature. On the other hand, in the UPF, which represent moderately fertile N conditions, net N transformation rates and N availability were dependent to the generally known regulation by soil temperature and soil water content. Stand density might indirectly affect the N transformations, N availability, and ecosystem productivity through different soil moisture conditions. The differing patterns of different inorganic N indices provide useful insight into the N availability in each forest and potential applicability of ion exchange resin assay. View Full-Text
Keywords: Alnus japonica; ion exchange resin; nitrogen mineralization; Pinus densiflora; soil moisture Alnus japonica; ion exchange resin; nitrogen mineralization; Pinus densiflora; soil moisture

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Yoon, T.K.; Noh, N.J.; Chung, H.; Yang, A.-R.; Son, Y. Soil Nitrogen Transformations and Availability in Upland Pine and Bottomland Alder Forests. Forests 2015, 6, 2941-2958.

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